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Old 01-04-2011, 03:58 PM #17
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Default Re: Black Weekend. I lost three 445 diodes!

just thought I'd quote myself from an earlier post, the point being that generally all Flexmods should perform similarly:

Quote:
Originally Posted by ElektroFreak View Post
I've put mine on my scope and I always see a very small voltage/current spike on power up, but the current always ramps up nice and smooth under modulation, no spikes there. The initial spike *could* be causing premature degradation, but it's not a very big spike so I don't know for sure.
however the fact that you are using an older FlexMod leaves me at a loss. Are you driving multiple diodes with a single driver?


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Old 01-04-2011, 06:09 PM #18
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Default Re: Black Weekend. I lost three 445 diodes!

Quote:
Originally Posted by Coherent Light View Post
could you not install a filter cap on the output just to be on the safe side?
That would screw with the modulation, especially at high speeds.
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Old 01-05-2011, 04:14 AM #19
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Default Re: Black Weekend. I lost three 445 diodes!

Quote:
Originally Posted by ElektroFreak View Post
just thought I'd quote myself from an earlier post, the point being that generally all Flexmods should perform similarly:



however the fact that you are using an older FlexMod leaves me at a loss. Are you driving multiple diodes with a single driver?
Yes, At first I had 2 diodes in series. 1.2A 10V. It had been running for many, many hours without any issues...see my avatar.

After they both popped I used a single diode...which also blew after modulation.

The conclusion: (thanks for all the input from you guys)

I'm going to buy this driver for ebay

High Power Laser Diode Driver for Shows: Red Green Blue - eBay (item 200542526302 end time Jan-10-11 22:43:54 PST)


then, I'll hook it up to another 445 (I have 4 left) and MODULATE. Using 100mA as threshold.

BTW, the reason I has it on 0.01A as threshold was because the laser "glows" brighter as you add more and more mA's. It's annoying. When I'm not modulating I want the laser to be OFF. But in this casue the laser is always ON (even it it's not lasing). I may have to include a shutter in my system.

Will let you guys know.

B


Forgot to tell you... Before I did the whole modulate-blow-laser thing, mixing 1 watt green with 2+ watt blue gave an almost white light. It was incredible. When I mixed the 1 watt blue with the green I got this amazing turquoise blue...I'm guessing the similar colour as the 473 line.
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Last edited by blrock; 01-05-2011 at 04:22 AM.
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Old 01-05-2011, 04:21 AM #20
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Default Re: Black Weekend. I lost three 445 diodes!

The driver in your link is actually the new Flexmod P3..
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Old 01-05-2011, 04:28 AM #21
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Default Re: Black Weekend. I lost three 445 diodes!

Quote:
Originally Posted by ElektroFreak View Post
The driver in your link is actually the new Flexmod P3..
I'll have to try it........thx
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Old 02-10-2011, 06:24 AM #22
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Default Re: Black Weekend. I lost three 445 diodes!

UPDATE: 20 FEB 2011

My two new Flexmod P3 have arrived and sitting in customs. Should have it before the weekend.

Going to try modulate another 445nm and hopefully it doesn't kill it. Will post results....
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Old 02-10-2011, 07:34 AM #23
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Default Re: Black Weekend. I lost three 445 diodes!

3 diodes in one weekend? $150 ouchies....

Better luck on the next try!
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Old 02-10-2011, 11:33 PM #24
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Default Re: Black Weekend. I lost three 445 diodes!

RIP as i try to build my own 445nm
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Old 02-15-2011, 11:32 AM #25
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Default Re: Black Weekend. I lost three 445 diodes!

I have my two new Flexmod P3's. As per all the excellent advise on this forum, my 300mw 660nm volunteered for possible death by modulation. I'll modulate it between 20mA-300mA.
If he survives I'll hook up the 445nm.....
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500mw 635nm (DEAD Apr 2011)
259mw 660nm
2 Watt 808nm
205mw 404nm
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Countless laser diodes.
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Old 02-17-2011, 05:10 AM #26
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Default Re: Black Weekend. I lost three 445 diodes!

The short answer. SUCCESS!

Last night I connected a 445nm to the Flexmod P3. Threshold 150mA, Max 1.4A.
I first I ran the modulation at 1K pps on the software. This resulted in a random flashing of the laser. After awhile I increased it to 45K PPS which produced a steady beam with very little flicker. I ran it at this speed for 30 minutes.

Conslusion. It does look like my older N2 Flexmod cause the death of the 3 diodes.
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MY LASER COLLECTION:
3.6 Watt RGB
1657mW 532nm Lab
10 one Watt 445nm
10W 808nm Fiber system (anyone want to swop for small Green Argon?)
1183mW 650nm
1800mW Watt 445nm (2x900mW through PBS)
510mW 532nm
500mw 635nm (DEAD Apr 2011)
259mw 660nm
2 Watt 808nm
205mw 404nm
YAG 2J Pulse (Still need a PSU)
Countless laser diodes.
Lots of 5-10mw green lasers
3mw He-Ne (My first laser. 1995)
20 high power c-mounts
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