Old 03-24-2015, 02:58 AM #1
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Default Deep red low power laser modules

I'm looking for some laser modules (the 5-ish mW variety/style you normally find on ebay) but I need it in a deep red/near-ir light. Ideally I would like something in the 710-720nm range, but I can live with another 20-30-ish nm on either side.

For all my scouring the webs, I can't find such devices. I have found higher powered lasers in that range, but I don't need the power and associated cost.

Anyone have any recommendations where I could find such modules?


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Old 03-24-2015, 03:11 AM #2
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Default Re: Deep red low power laser modules

For medical use?

685nm 35mw Red single transverse mode laser diode medical laser: http://www.ebay.com/itm/New-HLD68503...-/281638068886

750nm 5mw: This might be too far towards IR ? http://www.ebay.com/itm/201295414935

690nm 30mw: http://www.ebay.com/itm/New-HL6738MG...-/281638066390

705 & 730nm 50mw: http://www.prophotonix.com/resources...-selector.aspx HL7301MG/02MG 730nm / 50mW InGaAsP Laser Diode:
PDF http://photos.imageevent.com/qdf_fil...s/Ushio037.pdf (for 705nm @50mw search for HL7001MG-A or HL7002MG-A by Ushio).

More expensive lab 720nm 1-100mw: http://www.cnilaser.com/red_laser720.htm

670nm 5mw: http://www.laserpointerpro.com/5mw-l...ht-p-1735.html

690nm 30mw: http://www.tem-laser.com/views.asp?hw_id=304

Maybe this will work, 600 or 700nm? http://www.ebay.com/itm/251791544426 - I don't know anything about it, better ask if interested.

If you want 5mw output from these higher mw rated laser diodes, maybe they can be set that low, research their minimum lased output power and set the driver current accordingly. Of course, most are diodes and not modules but it isn't too difficult to get the needed parts to make them. I realize many of these are outside the range you asked, but that's as close as I could find.
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Old 03-24-2015, 06:36 AM #3
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Default Re: Deep red low power laser modules

It might help if you told us what your application is. most of the diodes in that area are 500+ dollars and usually in the 40mW range. you can't move them up or down in power without altering the wavelength too to a degree, though that doesn't sound like a problem for you.
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Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
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671nm: CNI PGL-III-C-100
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Old 03-24-2015, 06:53 PM #4
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Default Re: Deep red low power laser modules

Aixiz used to sell a 4.5mW 780nm module inexpensively, I still have one somewhere. They might still carry it, it's worth a shot.
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Old 03-24-2015, 07:32 PM #5
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Default Re: Deep red low power laser modules

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Originally Posted by Sigurthr View Post
Aixiz used to sell a 4.5mW 780nm module inexpensively, I still have one somewhere. They might still carry it, it's worth a shot.
780nm are found in CD-R burners, but are infrared and 150mW+

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Old 03-24-2015, 08:29 PM #6
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Default Re: Deep red low power laser modules

Not all of them are >150mW. I've metered mine at 4.5mW. Aixiz is usually pretty accurate with listed powers too.
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Old 03-24-2015, 09:09 PM #7
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Default Re: Deep red low power laser modules

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Originally Posted by Sigurthr View Post
Not all of them are >150mW. I've metered mine at 4.5mW. Aixiz is usually pretty accurate with listed powers too.
That said, at 5mW I think isn't deep red, but almost invisible.
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Old 03-24-2015, 09:14 PM #8
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Default Re: Deep red low power laser modules

Depends on your eyes, but that's another can of worms. It is indeed quite dim, but we don't know the OP's application.
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Old 03-24-2015, 09:20 PM #9
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Default Re: Deep red low power laser modules

I agree with you.

Let's wait some more info from outsider.

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Old 03-26-2015, 02:03 AM #10
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Default Re: Deep red low power laser modules

Quote:
Originally Posted by Alaskan View Post
For medical use?

685nm 35mw Red single transverse mode laser diode medical laser: New HLD685035K5J 685nm 35mW Red Single Transverse Mode Laser Diode Medical Laser | eBay

750nm 5mw: This might be too far towards IR ? New Sharp LT030MD Laser Diode 5mW 750nm Infrared IR 9mm | eBay

690nm 30mw: New HL6738MG 690nm 30mW N Pin Type 5 6mm Laser Diode Red Laser Diode | eBay

705 & 730nm 50mw: Laser Diode Selector HL7301MG/02MG 730nm / 50mW InGaAsP Laser Diode:
PDF http://photos.imageevent.com/qdf_fil...s/Ushio037.pdf (for 705nm @50mw search for HL7001MG-A or HL7002MG-A by Ushio).

More expensive lab 720nm 1-100mw: 720 nm Red Solid State Laser

670nm 5mw: 5mW LT-PY-5 Red Laser Point Fixed Focus Laser Sight at Laserpointerpro.com

690nm 30mw: 690nm 30mw red Laser Diode Opnext HL6738MG Laser Diodes(SM&MM) 685nm Laser Diodes

Maybe this will work, 600 or 700nm? Thorlabs LDM 600 700nm Red Laser Source | eBay - I don't know anything about it, better ask if interested.

If you want 5mw output from these higher mw rated laser diodes, maybe they can be set that low, research their minimum lased output power and set the driver current accordingly. Of course, most are diodes and not modules but it isn't too difficult to get the needed parts to make them. I realize many of these are outside the range you asked, but that's as close as I could find.
Any links to stores selling the 705nm? (I mean stores you can buy online with a credit card, which I don't think is the case with that site)
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780nm: module (2.7mW avg|5mW rtd)
808nm: Classic modded from a 532nm (162mW avg)
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Old 03-27-2015, 02:48 AM #11
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Default Re: Deep red low power laser modules

Thank you so much for the info so far guys.

The application is to use as a tool to help my DSLR camera to focus in near complete darkness.
Most external camera flashes have an auto focus assist light, which is a deep red color.
The LED on the flashes is not a laser, but a regular LED. I have measured the wavelength of 3 that led on 3 different makes of flashes, and they were between 710nm and 740nm.
(I know a physics professors at a local university, and we used a spectroscope at his lab, so I know the measurement is accurate)

The plan is to find some deep red (in similar wavelength if I can find) and pass the light through a diffraction grating, which will give the camera something to focus on.
I have purchased a few 780nm laser modules from ebay and a couple from Aixiz to see what the light looks like, and more importantly if the camera can use that light to assist focusing. I don't really care if the eye can see it. More interested in making sure the camera can see it.
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Old 03-27-2015, 03:51 AM #12
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Default Re: Deep red low power laser modules

Most digital cameras have an internal ir blocking filter, so keep in mind that your camera may not be too sensitive to 780nm. A more suitable wavelength would be 685nm. While the LED may have had a spectral peak at 725nm, LEDs often have such a wide spectral emission width that the camera might be mostly using the shorter wavelengths.
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Old 03-27-2015, 11:29 PM #13
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Yes all DSLRs have an IR filter (unless otherwise specifically mentioned) but that IR filter is right in front of the sensor.
The focusing system in DSLRs has a separate light path and uses what's called a phase detect.
This system has no it filter in front of it.
What I don't know is at what wavelength the sensitivity of the phase detect system drops off.
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Old 03-28-2015, 03:14 AM #14
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Default Re: Deep red low power laser modules

Ahh, that is good to know. My only high end camera experience is with Mirrorless (MILC/DSLM) cameras which don't have a secondary light path, but have the same focus illuminator.
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