Discussion:
[EE] Laser diode sources
David Van Horn
2018-09-05 15:52:29 UTC
Permalink
I just looked on Digikey for Laser diodes, and the least expensive I could find, was about $5 in Q 50,000!

Where can I source small, very inexpensive visible laser diodes? 1 to 5 mW would be fine. No other particular requirements.
I might even go as far as bare chips for a COB design.

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AB Pearce - UKRI STFC
2018-09-05 16:24:31 UTC
Permalink
Buying up laser pointers at your local dollar shop?

What is the intended use?


-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of David Van Horn
Sent: 05 September 2018 16:52
To: ***@mit.edu
Subject: [EE] Laser diode sources

I just looked on Digikey for Laser diodes, and the least expensive I could find, was about $5 in Q 50,000!

Where can I source small, very inexpensive visible laser diodes? 1 to 5 mW would be fine. No other particular requirements.
I might even go as far as bare chips for a COB design.

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Jon Chandler
2018-09-05 16:34:58 UTC
Permalink
Look at Elecrow.com. I think they have them for 40 cents a piece.

On Wed, Sep 5, 2018, 9:27 AM AB Pearce - UKRI STFC <***@stfc.ac.uk>
wrote:

> Buying up laser pointers at your local dollar shop?
>
> What is the intended use?
>
>
> -----Original Message-----
> From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of
> David Van Horn
> Sent: 05 September 2018 16:52
> To: ***@mit.edu
> Subject: [EE] Laser diode sources
>
> I just looked on Digikey for Laser diodes, and the least expensive I could
> find, was about $5 in Q 50,000!
>
> Where can I source small, very inexpensive visible laser diodes? 1 to 5
> mW would be fine. No other particular requirements.
> I might even go as far as bare chips for a COB design.
>
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
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Alan
2018-09-05 17:12:37 UTC
Permalink
eBay as low as .75c us per packaged diode https://www.ebay.com/itm/TO-18-5mW-650nm-Red-Laser-Diode-Module-Laser-Generator-PR/323377784045?hash=item4b4ad164ed:g:G4QAAOSwYFpbSBJJ

Or less for complete module in quantity 50 for $16.00
https://www.ebay.com/itm/50pcs-5V-5W-Laser-Dot-Diode-Module-Head-WL-Red-mini-650nm-6mm-Copper-Head/332349309433?hash=item4d619001f9:g:U4cAAOSwxbpZl64V

But go here for a vast selection but not as cheap as I thought but about $1.00 for bare chip 650nm bare chip
http://www.roithner-laser.com/
Here for price list
http://www.roithner-laser.com/pricelist.pdf

And then eBay has cat toy laser pointers for .75c
https://www.ebay.com/itm/Random-Interactive-Led-Training-Funny-Cat-Pet-Play-Toy-Laser-Pointer-Pen/302716547735?hash=item467b4ff297:g:hTkAAOSwx3Va4BbD



Looking forward,
Al Shinn (Tinker)


> On Sep 5, 2018, at 9:00 AM, piclist-***@mit.edu wrote:
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> 1. [EE] Laser diode sources (David Van Horn)
>
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 5 Sep 2018 15:52:29 +0000
> From: David Van Horn <***@backcountryaccess.com>
> Subject: [EE] Laser diode sources
> To: "***@mit.edu" <***@mit.edu>
> Message-ID:
> <***@BL2PR01MB322.prod.exchangelabs.com>
>
> Content-Type: text/plain; charset="us-ascii"
>
> I just looked on Digikey for Laser diodes, and the least expensive I could find, was about $5 in Q 50,000!
>
> Where can I source small, very inexpensive visible laser diodes? 1 to 5 mW would be fine. No other particular requirements.
> I might even go as far as bare chips for a COB design.
>
>
>
> ------------------------------
>
> --
> http://www.piclist.com/techref/piclist
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
>
> End of Piclist Digest, Vol 170, Issue 3
> ***************************************
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David Van Horn
2018-09-05 17:48:46 UTC
Permalink
I'm looking for parts I can design into a product.


-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Alan
Sent: Wednesday, September 5, 2018 11:13 AM
To: ***@mit.edu
Subject: Re: [EE] Laser diode sources

eBay as low as .75c us per packaged diode https://www.ebay.com/itm/TO-18-5mW-650nm-Red-Laser-Diode-Module-Laser-Generator-PR/323377784045?hash=item4b4ad164ed:g:G4QAAOSwYFpbSBJJ

Or less for complete module in quantity 50 for $16.00 https://www.ebay.com/itm/50pcs-5V-5W-Laser-Dot-Diode-Module-Head-WL-Red-mini-650nm-6mm-Copper-Head/332349309433?hash=item4d619001f9:g:U4cAAOSwxbpZl64V

But go here for a vast selection but not as cheap as I thought but about $1.00 for bare chip 650nm bare chip http://www.roithner-laser.com/ Here for price list http://www.roithner-laser.com/pricelist.pdf

And then eBay has cat toy laser pointers for .75c https://www.ebay.com/itm/Random-Interactive-Led-Training-Funny-Cat-Pet-Play-Toy-Laser-Pointer-Pen/302716547735?hash=item467b4ff297:g:hTkAAOSwx3Va4BbD



Looking forward,
Al Shinn (Tinker)


> On Sep 5, 2018, at 9:00 AM, piclist-***@mit.edu wrote:
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> When replying, please edit your Subject line so it is more specific
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> Today's Topics:
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> 1. [EE] Laser diode sources (David Van Horn)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 5 Sep 2018 15:52:29 +0000
> From: David Van Horn <***@backcountryaccess.com>
> Subject: [EE] Laser diode sources
> To: "***@mit.edu" <***@mit.edu>
> Message-ID:
> <***@BL2PR01MB322.prod.exchangelabs.com>
>
> Content-Type: text/plain; charset="us-ascii"
>
> I just looked on Digikey for Laser diodes, and the least expensive I could find, was about $5 in Q 50,000!
>
> Where can I source small, very inexpensive visible laser diodes? 1 to 5 mW would be fine. No other particular requirements.
> I might even go as far as bare chips for a COB design.
>
>
>
> ------------------------------
>
> --
> http://www.piclist.com/techref/piclist
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
>
> End of Piclist Digest, Vol 170, Issue 3
> ***************************************
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Clint Jay
2018-09-05 19:11:23 UTC
Permalink
To what sort of level, are we talking the bare metal transistor can type
with three pins where you need to spin your own driver or would something a
little more integrated do?

On Wed, 5 Sep 2018 at 18:55, David Van Horn <
***@backcountryaccess.com> wrote:

> I'm looking for parts I can design into a product.
>
>
> -----Original Message-----
> From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Alan
> Sent: Wednesday, September 5, 2018 11:13 AM
> To: ***@mit.edu
> Subject: Re: [EE] Laser diode sources
>
> eBay as low as .75c us per packaged diode
> https://www.ebay.com/itm/TO-18-5mW-650nm-Red-Laser-Diode-Module-Laser-Generator-PR/323377784045?hash=item4b4ad164ed:g:G4QAAOSwYFpbSBJJ
>
> Or less for complete module in quantity 50 for $16.00
> https://www.ebay.com/itm/50pcs-5V-5W-Laser-Dot-Diode-Module-Head-WL-Red-mini-650nm-6mm-Copper-Head/332349309433?hash=item4d619001f9:g:U4cAAOSwxbpZl64V
>
> But go here for a vast selection but not as cheap as I thought but about
> $1.00 for bare chip 650nm bare chip http://www.roithner-laser.com/ Here
> for price list http://www.roithner-laser.com/pricelist.pdf
>
> And then eBay has cat toy laser pointers for .75c
> https://www.ebay.com/itm/Random-Interactive-Led-Training-Funny-Cat-Pet-Play-Toy-Laser-Pointer-Pen/302716547735?hash=item467b4ff297:g:hTkAAOSwx3Va4BbD
>
>
>
> Looking forward,
> Al Shinn (Tinker)
>
>
> > On Sep 5, 2018, at 9:00 AM, piclist-***@mit.edu wrote:
> >
> > Send Piclist mailing list submissions to
> > ***@mit.edu
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
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> > or, via email, send a message with subject or body 'help' to
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> > You can reach the person managing the list at
> > piclist-***@mit.edu
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Piclist digest..."
> >
> >
> > Today's Topics:
> >
> > 1. [EE] Laser diode sources (David Van Horn)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Wed, 5 Sep 2018 15:52:29 +0000
> > From: David Van Horn <***@backcountryaccess.com>
> > Subject: [EE] Laser diode sources
> > To: "***@mit.edu" <***@mit.edu>
> > Message-ID:
> > <
> ***@BL2PR01MB322.prod.exchangelabs.com>
> >
> > Content-Type: text/plain; charset="us-ascii"
> >
> > I just looked on Digikey for Laser diodes, and the least expensive I
> could find, was about $5 in Q 50,000!
> >
> > Where can I source small, very inexpensive visible laser diodes? 1 to 5
> mW would be fine. No other particular requirements.
> > I might even go as far as bare chips for a COB design.
> >
> >
> >
> > ------------------------------
> >
> > --
> > http://www.piclist.com/techref/piclist
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> >
> > End of Piclist Digest, Vol 170, Issue 3
> > ***************************************
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Clint. M0UAW IO83

*No trees were harmed in the sending of this mail. However, a large number
of electrons were greatly inconvenienced.*
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David Van Horn
2018-09-05 19:38:16 UTC
Permalink
Possibly even bare dice for COB.

I'd be happy with an 0402 top emitter, but I don't expect to find it.

-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Clint Jay
Sent: Wednesday, September 5, 2018 1:11 PM
To: ***@mit.edu
Subject: Re: [EE] Laser diode sources

To what sort of level, are we talking the bare metal transistor can type with three pins where you need to spin your own driver or would something a little more integrated do?

On Wed, 5 Sep 2018 at 18:55, David Van Horn < ***@backcountryaccess.com> wrote:

> I'm looking for parts I can design into a product.
>
>
> -----Original Message-----
> From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of
> Alan
> Sent: Wednesday, September 5, 2018 11:13 AM
> To: ***@mit.edu
> Subject: Re: [EE] Laser diode sources
>
> eBay as low as .75c us per packaged diode
> https://www.ebay.com/itm/TO-18-5mW-650nm-Red-Laser-Diode-Module-Laser-
> Generator-PR/323377784045?hash=item4b4ad164ed:g:G4QAAOSwYFpbSBJJ
>
> Or less for complete module in quantity 50 for $16.00
> https://www.ebay.com/itm/50pcs-5V-5W-Laser-Dot-Diode-Module-Head-WL-Re
> d-mini-650nm-6mm-Copper-Head/332349309433?hash=item4d619001f9:g:U4cAAO
> SwxbpZl64V
>
> But go here for a vast selection but not as cheap as I thought but
> about
> $1.00 for bare chip 650nm bare chip http://www.roithner-laser.com/
> Here for price list http://www.roithner-laser.com/pricelist.pdf
>
> And then eBay has cat toy laser pointers for .75c
> https://www.ebay.com/itm/Random-Interactive-Led-Training-Funny-Cat-Pet
> -Play-Toy-Laser-Pointer-Pen/302716547735?hash=item467b4ff297:g:hTkAAOS
> wx3Va4BbD
>
>
>
> Looking forward,
> Al Shinn (Tinker)
>
>
> > On Sep 5, 2018, at 9:00 AM, piclist-***@mit.edu wrote:
> >
> > Send Piclist mailing list submissions to
> > ***@mit.edu
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > http://mailman.mit.edu/mailman/listinfo/piclist
> > or, via email, send a message with subject or body 'help' to
> > piclist-***@mit.edu
> >
> > You can reach the person managing the list at
> > piclist-***@mit.edu
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Piclist digest..."
> >
> >
> > Today's Topics:
> >
> > 1. [EE] Laser diode sources (David Van Horn)
> >
> >
> > --------------------------------------------------------------------
> > --
> >
> > Message: 1
> > Date: Wed, 5 Sep 2018 15:52:29 +0000
> > From: David Van Horn <***@backcountryaccess.com>
> > Subject: [EE] Laser diode sources
> > To: "***@mit.edu" <***@mit.edu>
> > Message-ID:
> > <
> ***@BL2PR01MB322.prod.exchangelabs.c
> om>
> >
> > Content-Type: text/plain; charset="us-ascii"
> >
> > I just looked on Digikey for Laser diodes, and the least expensive I
> could find, was about $5 in Q 50,000!
> >
> > Where can I source small, very inexpensive visible laser diodes? 1
> > to 5
> mW would be fine. No other particular requirements.
> > I might even go as far as bare chips for a COB design.
> >
> >
> >
> > ------------------------------
> >
> > --
> > http://www.piclist.com/techref/piclist
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> >
> > End of Piclist Digest, Vol 170, Issue 3
> > ***************************************
> --
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Jason White
2018-09-05 21:54:47 UTC
Permalink
Perhaps there is a reputable Chinese manufacturer of laser modules that you
could work with?

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David Van Horn
2018-09-05 21:57:54 UTC
Permalink
I sure don't know who, that's why I asked.


-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Jason White
Sent: Wednesday, September 5, 2018 3:55 PM
To: Microcontroller discussion list - Public. <***@mit.edu>
Subject: Re: [EE] Laser diode sources

Perhaps there is a reputable Chinese manufacturer of laser modules that you could work with?

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Bob Blick
2018-09-05 23:04:54 UTC
Permalink
Hi David,

What sort of lifetime, what temperature range, and do you need it to have a monitor photodiode?

Friendly regards, Bob
________________________________________
From: piclist-***@mit.edu <piclist-***@mit.edu> on behalf of David Van Horn
Sent: Wednesday, September 5, 2018 8:52 AM
To: ***@mit.edu
Subject: [EE] Laser diode sources

I just looked on Digikey for Laser diodes, and the least expensive I could find, was about $5 in Q 50,000!

Where can I source small, very inexpensive visible laser diodes? 1 to 5 mW would be fine. No other particular requirements.
I might even go as far as bare chips for a COB design.

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David Van Horn
2018-09-05 23:23:17 UTC
Permalink
Lifetime, at least hundreds of hours power on.
Temperature, -20 to 40C
No monitor needed.
Visible red, no particular wavelength though shorter is better.


-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Bob Blick
Sent: Wednesday, September 5, 2018 5:05 PM
To: Microcontroller discussion list - Public. <***@mit.edu>
Subject: Re: [EE] Laser diode sources

Hi David,

What sort of lifetime, what temperature range, and do you need it to have a monitor photodiode?

Friendly regards, Bob
________________________________________
From: piclist-***@mit.edu <piclist-***@mit.edu> on behalf of David Van Horn
Sent: Wednesday, September 5, 2018 8:52 AM
To: ***@mit.edu
Subject: [EE] Laser diode sources

I just looked on Digikey for Laser diodes, and the least expensive I could find, was about $5 in Q 50,000!

Where can I source small, very inexpensive visible laser diodes? 1 to 5 mW would be fine. No other particular requirements.
I might even go as far as bare chips for a COB design.

--
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Bob Blick
2018-09-06 04:25:12 UTC
Permalink
If you need that big a temperature range then you'll either need an APC driver using photodiode or else put yourself in a higher regulatory class than you otherwise could fit in. I've done clever things with temperature compensation, not using a photodiode, but only because of the situation, not out of choice. It's much easier with a photodiode.

Laser diodes in TO-56 cases with photodiode can be had for under a dollar. You'll need a lens.

Cheerful regards, Bob
________________________________________
From: piclist-***@mit.edu <piclist-***@mit.edu> on behalf of David Van Horn
Sent: Wednesday, September 5, 2018 4:23 PM
To: Microcontroller discussion list - Public.
Subject: RE: [EE] Laser diode sources

Lifetime, at least hundreds of hours power on.
Temperature, -20 to 40C
No monitor needed.
Visible red, no particular wavelength though shorter is better.


-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Bob Blick
Sent: Wednesday, September 5, 2018 5:05 PM
To: Microcontroller discussion list - Public. <***@mit.edu>
Subject: Re: [EE] Laser diode sources

Hi David,

What sort of lifetime, what temperature range, and do you need it to have a monitor photodiode?

Friendly regards, Bob
________________________________________
From: piclist-***@mit.edu <piclist-***@mit.edu> on behalf of David Van Horn
Sent: Wednesday, September 5, 2018 8:52 AM
To: ***@mit.edu
Subject: [EE] Laser diode sources

I just looked on Digikey for Laser diodes, and the least expensive I could find, was about $5 in Q 50,000!

Where can I source small, very inexpensive visible laser diodes? 1 to 5 mW would be fine. No other particular requirements.
I might even go as far as bare chips for a COB design.

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Joe McCauley
2018-09-12 13:14:44 UTC
Permalink
I'm open to correction on this, but is the monitor photodiode not there to provide feedback to the driver circuit? As far as I know things can go wrong easily if you don't have this. At the very least, output will be very variable.

Any diodes I've used have this built into the package.

Joe

-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of David Van Horn
Sent: Thursday 6 September 2018 00:23
To: Microcontroller discussion list - Public. <***@mit.edu>
Subject: RE: [EE] Laser diode sources

Lifetime, at least hundreds of hours power on.
Temperature, -20 to 40C
No monitor needed.
Visible red, no particular wavelength though shorter is better.


-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Bob Blick
Sent: Wednesday, September 5, 2018 5:05 PM
To: Microcontroller discussion list - Public. <***@mit.edu>
Subject: Re: [EE] Laser diode sources

Hi David,

What sort of lifetime, what temperature range, and do you need it to have a monitor photodiode?

Friendly regards, Bob
________________________________________
From: piclist-***@mit.edu <piclist-***@mit.edu> on behalf of David Van Horn
Sent: Wednesday, September 5, 2018 8:52 AM
To: ***@mit.edu
Subject: [EE] Laser diode sources

I just looked on Digikey for Laser diodes, and the least expensive I could find, was about $5 in Q 50,000!

Where can I source small, very inexpensive visible laser diodes? 1 to 5 mW would be fine. No other particular requirements.
I might even go as far as bare chips for a COB design.

--
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Clint Jay
2018-09-12 13:29:08 UTC
Permalink
That’s my understanding of it. Without that pin they can be a handy source
of single shot ultra fast rise time pulses but unfortunately and rather
inconveniently they require replacement after every pulse.

On Wed, 12 Sep 2018 at 14:16, Joe McCauley <***@tcd.ie> wrote:

> I'm open to correction on this, but is the monitor photodiode not there to
> provide feedback to the driver circuit? As far as I know things can go
> wrong easily if you don't have this. At the very least, output will be very
> variable.
>
> Any diodes I've used have this built into the package.
>
> Joe
>
> -----Original Message-----
> From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of
> David Van Horn
> Sent: Thursday 6 September 2018 00:23
> To: Microcontroller discussion list - Public. <***@mit.edu>
> Subject: RE: [EE] Laser diode sources
>
> Lifetime, at least hundreds of hours power on.
> Temperature, -20 to 40C
> No monitor needed.
> Visible red, no particular wavelength though shorter is better.
>
>
> -----Original Message-----
> From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Bob
> Blick
> Sent: Wednesday, September 5, 2018 5:05 PM
> To: Microcontroller discussion list - Public. <***@mit.edu>
> Subject: Re: [EE] Laser diode sources
>
> Hi David,
>
> What sort of lifetime, what temperature range, and do you need it to have
> a monitor photodiode?
>
> Friendly regards, Bob
> ________________________________________
> From: piclist-***@mit.edu <piclist-***@mit.edu> on behalf of
> David Van Horn
> Sent: Wednesday, September 5, 2018 8:52 AM
> To: ***@mit.edu
> Subject: [EE] Laser diode sources
>
> I just looked on Digikey for Laser diodes, and the least expensive I could
> find, was about $5 in Q 50,000!
>
> Where can I source small, very inexpensive visible laser diodes? 1 to 5
> mW would be fine. No other particular requirements.
> I might even go as far as bare chips for a COB design.
>
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*No trees were harmed in the sending of this mail. However, a large number
of electrons were greatly inconvenienced.*
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David VanHorn
2018-09-12 15:05:26 UTC
Permalink
Many pointers I have opened simply have the laser and a resistor.

On Wed, Sep 12, 2018, 7:29 AM Clint Jay <***@gmail.com> wrote:

> That’s my understanding of it. Without that pin they can be a handy source
> of single shot ultra fast rise time pulses but unfortunately and rather
> inconveniently they require replacement after every pulse.
>
> On Wed, 12 Sep 2018 at 14:16, Joe McCauley <***@tcd.ie> wrote:
>
> > I'm open to correction on this, but is the monitor photodiode not there
> to
> > provide feedback to the driver circuit? As far as I know things can go
> > wrong easily if you don't have this. At the very least, output will be
> very
> > variable.
> >
> > Any diodes I've used have this built into the package.
> >
> > Joe
> >
> > -----Original Message-----
> > From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of
> > David Van Horn
> > Sent: Thursday 6 September 2018 00:23
> > To: Microcontroller discussion list - Public. <***@mit.edu>
> > Subject: RE: [EE] Laser diode sources
> >
> > Lifetime, at least hundreds of hours power on.
> > Temperature, -20 to 40C
> > No monitor needed.
> > Visible red, no particular wavelength though shorter is better.
> >
> >
> > -----Original Message-----
> > From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Bob
> > Blick
> > Sent: Wednesday, September 5, 2018 5:05 PM
> > To: Microcontroller discussion list - Public. <***@mit.edu>
> > Subject: Re: [EE] Laser diode sources
> >
> > Hi David,
> >
> > What sort of lifetime, what temperature range, and do you need it to have
> > a monitor photodiode?
> >
> > Friendly regards, Bob
> > ________________________________________
> > From: piclist-***@mit.edu <piclist-***@mit.edu> on behalf of
> > David Van Horn
> > Sent: Wednesday, September 5, 2018 8:52 AM
> > To: ***@mit.edu
> > Subject: [EE] Laser diode sources
> >
> > I just looked on Digikey for Laser diodes, and the least expensive I
> could
> > find, was about $5 in Q 50,000!
> >
> > Where can I source small, very inexpensive visible laser diodes? 1 to 5
> > mW would be fine. No other particular requirements.
> > I might even go as far as bare chips for a COB design.
> >
> > --
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> > --
> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> > --
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> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> --
> Clint. M0UAW IO83
>
> *No trees were harmed in the sending of this mail. However, a large number
> of electrons were greatly inconvenienced.*
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Bob Blick
2018-09-12 16:37:09 UTC
Permalink
If you run at 25C all the time then you could do that, too.

You spec'd -20 to +50C. Most laser diodes have a -10 to +50C operating spec. There's no problem running at -20.

The real kicker will be threshold current(the current that the laser turns on). At +50 it will be the same or higher than your maximum operating current at -20. You could set a current that barely makes the laser operate at high temperatures, but that same current at low temperatures puts out over 5 milliwatts. At best, expect 5 milliwatts at -20 and 0.2 milliwatt at +40C. At +50C you'll get nothing.

And in reality, you'll never get much output at +50C anyway, even with a proper driver, because you are buying cheap diodes and everybody lies. But you'll at least be able to get a milliwatt or so, while keeping below 5 under any condition.

Best regards, Bob


________________________________________
From: piclist-***@mit.edu <piclist-***@mit.edu> on behalf of David VanHorn
Sent: Wednesday, September 12, 2018 8:05 AM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Laser diode sources

Many pointers I have opened simply have the laser and a resistor.

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David Van Horn
2018-09-13 13:57:45 UTC
Permalink
I could relax the top end to 40C if needed.

-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Bob Blick
Sent: Wednesday, September 12, 2018 10:37 AM
To: Microcontroller discussion list - Public. <***@mit.edu>
Subject: Re: [EE] Laser diode sources

If you run at 25C all the time then you could do that, too.

You spec'd -20 to +50C. Most laser diodes have a -10 to +50C operating spec. There's no problem running at -20.

The real kicker will be threshold current(the current that the laser turns on). At +50 it will be the same or higher than your maximum operating current at -20. You could set a current that barely makes the laser operate at high temperatures, but that same current at low temperatures puts out over 5 milliwatts. At best, expect 5 milliwatts at -20 and 0.2 milliwatt at +40C. At +50C you'll get nothing.

And in reality, you'll never get much output at +50C anyway, even with a proper driver, because you are buying cheap diodes and everybody lies. But you'll at least be able to get a milliwatt or so, while keeping below 5 under any condition.

Best regards, Bob


________________________________________
From: piclist-***@mit.edu <piclist-***@mit.edu> on behalf of David VanHorn
Sent: Wednesday, September 12, 2018 8:05 AM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Laser diode sources

Many pointers I have opened simply have the laser and a resistor.

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Art
2018-09-06 02:41:44 UTC
Permalink
Visible or IR??

Collimated, focused, or bare diodes?

How many do you need? Are unknown sourced doides ok. or do you need
diodes with traceable manufacturers with detailed specs

I do laser comm as a hobby, free space.

I have some very old IR diodes from Philips, bare diodes on small driver
boards that I have no use for and there's no way to get info on the
drivers. There are maybe 20 of them. I have no need for them and the
resale value is very low::>

Regards,

Art




On 09/05/2018 11:52 AM, David Van Horn wrote:
> I just looked on Digikey for Laser diodes, and the least expensive I could find, was about $5 in Q 50,000!
>
> Where can I source small, very inexpensive visible laser diodes? 1 to 5 mW would be fine. No other particular requirements.
> I might even go as far as bare chips for a COB design.
>

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David Van Horn
2018-09-06 15:22:19 UTC
Permalink
Visible, bare diodes, about 50,000

-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Art
Sent: Wednesday, September 5, 2018 8:42 PM
To: ***@mit.edu
Subject: Re: [EE] Laser diode sources

Visible or IR??

Collimated, focused, or bare diodes?

How many do you need? Are unknown sourced doides ok. or do you need diodes with traceable manufacturers with detailed specs

I do laser comm as a hobby, free space.

I have some very old IR diodes from Philips, bare diodes on small driver boards that I have no use for and there's no way to get info on the drivers. There are maybe 20 of them. I have no need for them and the resale value is very low::>

Regards,

Art




On 09/05/2018 11:52 AM, David Van Horn wrote:
> I just looked on Digikey for Laser diodes, and the least expensive I could find, was about $5 in Q 50,000!
>
> Where can I source small, very inexpensive visible laser diodes? 1 to 5 mW would be fine. No other particular requirements.
> I might even go as far as bare chips for a COB design.
>

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RussellMc
2018-09-07 02:35:18 UTC
Permalink
On Thu, 6 Sep 2018 at 03:56, David Van Horn <
***@backcountryaccess.com> wrote:

> Where can I source small, very inexpensive visible laser diodes? 1 to 5
> mW would be fine. No other particular requirements.
> I might even go as far as bare chips for a COB design.
>
> "Weave a circle round him thrice
and close your eyes in holy dread.,
for ...

"

laser diodes aliexpress

Black hole.

They know the answer but may not tell you.
Worth a look just for interest.

1.
https://laserlands.aliexpress.com/store/group/Laser-Diode/410920_211483305.html?src=google&albch=search&acnt=479-062-3723&isdl=y&aff_short_key=UneMJZVf&albcp=749199961&albag=39438926055&slnk=&trgt=aud-165594907443:dsa-42862830006&plac=&crea=176774166894&netw=g&device=c&mtctp=b&memo1=1t1&albbt=Google_7_search&aff_platform=google&gclid=CjwKCAjwoMPcBRAWEiwAiAqZh9mE_VgwSbSERF1VQYH7tbUh9oOaz0ASGKe0vUDqENFZPmTCU9CNxhoC78MQAvD_BwE

2.
https://laserlands.aliexpress.com/store/group/Laser-Diode-Module/410920_211478174.html
3.
https://www.aliexpress.com/store/group/Laser-Diode/1805451_510255859.html

Various modules etc
Down to $0.28 each in 10s.

https://www.aliexpress.com/w/wholesale-laser-diodes.html



_______________________________

3 Watt!
legion

https://www.aliexpress.com/w/wholesale-3w-laser-diode.html

100 W (tube) anbd other interesting

https://www.aliexpress.com/w/wholesale-100w-laser-diode.html
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