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Mystery laser diode

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LAN_403

MinorityCarrier

Mon Jan 18 2010, 05:04AM

Registered Member #2123 Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312

I'm combing through my stuff getting rid of things I'll never use, and I came across this laser diode with lens assembly I picked up about six years ago.
Does anyone recognize the package? I have two of the lens assemblies and one of these big-ass laser diodes w/heat sink. There are no mfg id numbers on the laser diode package, and no mfg name on the lens assemblies. I have not been able to find anything on the web.
If I can't I.D. the diode, I'm going to pitch these.

rp181

Mon Jan 18 2010, 05:41AM

Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529

I have seen those kind of packages on a website a long time ago, but I can't remember the name (A company that sells photonics, hamamatsu comes to mind).
Browse hamamatsu's website, you might find it for pin out's. I remember them being a package for multiwatt lasers.

...

Mon Jan 18 2010, 07:42AM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

The package is called a 'hhl' or high heat load package. The good news-there is a fairly high power diode in there. The bad-all manufactures use different pinouts, so short of very careful guessing there isn't much you can do to identify it. The lens assembly might actually be another laser, although more than likely it is just beam shaping optics.

I sent you a pm about a possible trade.

ps-the top 2 images don't work for me

...

Wed Jan 27 2010, 07:50AM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

Mike was kind enough to send the diodes and fiber coupler units to me gratis, so the least I can do is post relevant information I discover about it here

So far I have managed to decipher the pinout for the diode, which is as follows
(pins numbered from top to bottom as compared to the picture of the diode in the first post)
1 - tec +
2 - tec +
3 - temp sense thermistor (R(25c) = 10k)
4 - temp sense thermistor return
5 - diode +
6 - diode +
7 - diode -
8 - diode -
9 - monitor photodiode -
10 - monitor photodiode +
11 - tec -
12 - tec -

The wavelength appears to be in the 700-800nm range (I would guess 780, but I haven't had a chance to test), and the diode thresholds about 1.1A, which would imply the diode would do about 3w with 3-4A input current.

Sadly, the diode I got appears to have been damaged in some way, there are some 'dark' spots in the output beam (which implies not all of the emitter is lasing anymore), and the power is about 100mw at 3A input current (far below spec).

The diode itself projects a beam that is well collimated in the axis perpendicular to the power pins (maybe 1mrad or so), but fairly widely divergent in the opposite axis (maybe 100mrad). The fiber coupler appears to compensate for that (it has a few cylindrical lenses), but I haven't had a chance to play with it much.

Meatball

Wed Jan 27 2010, 04:48PM

Registered Member #2401 Joined: Mon Sept 28 2009, 04:25PM
Location:
Posts: 74

Its obviously multi-mode then.. there was no FAC attached to it of any kind?

plazmatron

Wed Jan 27 2010, 05:25PM

Registered Member #1134 Joined: Tue Nov 20 2007, 04:39PM
Location: Bonnie Scotland
Posts: 351

That looks like one of the old Sony laser diode packages from 10 years back!

AFIK these diodes were the most powerful available in their day, but by todays standards, were quite inefficient, and low powered. I remember lusting after a 25mW 670nm diode in the same package!

Les

MinorityCarrier

Wed Jan 27 2010, 06:38PM

Registered Member #2123 Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312

It's pretty obvious to me Pete is better set up to test/evaluate/utilize this diode than I ever was.

These items were part of a lot of surplus electronics I obtained from from a company in Boise, Idaho that was 'cleaning house'. There was no paperwork with the diode, or any oral history. Regrettably it seems the diode is on it's last leg. Perhaps the optics heads will prove useful.

hboy007

Wed Jan 27 2010, 11:12PM

Registered Member #1667 Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374

I have some 30 LD chips (500mW, 808nm) lying around here. I guess the optics would fit perfectly *cough*
one could replace the semiconductors and pump some Nd:YAG|KTP assembly with it.

Conundrum

Wed Jan 27 2010, 11:46PM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061

i have some 1w 808nm diodes here..

just a thought but you can get high wattage laser "rectangle" chips, what about cleaving one of these into segments and mounting that on the existing mount?

-A

EEYORE

Thu Jan 28 2010, 04:56AM

Registered Member #99 Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637

hboy007 wrote ...

I have some 30 LD chips (500mW, 808nm) lying around here. I guess the optics would fit perfectly *cough*
one could replace the semiconductors and pump some Nd:YAG|KTP assembly with it.

Have fun mounting that! Youll need nerves of steel, and a microscope to see with...
Matt

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