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Old 09-09-2011, 05:58 AM #1
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Default (Help) How to drive a Coherent Diode

Recently I am planning setting up a high power 808nm fiber couple laser pumping system by using a Coherent FAP-800 40W LD. I already got all the parts I need, but drivers. There seems no driver on the market can handle such a high current that diode needs with lower cost. And by high current, I mean over 30A. It seems I have to build one myself, because I don't want to spend $300 to buy a 50A PSU just for the diode use. I need this driver supply current at least 40A, 60 will be great. Also I hope I can modulate control my driver, TTL or analog even PWM, either one will be fine. Can anyone give me some ideas.


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Old 09-10-2011, 02:33 PM #2
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Default Re: (Help) How to drive a Coherent Diode

Sometimes lasers are expensive, no surprise here. A diode bar isn't one of the more common lasers. Building a driver yourself would be the cheapest and easiest solution, or find somebody to do it. I still have to build a driver for my own 20W diode bars, I have all the components.
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Old 09-10-2011, 09:40 PM #3
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Default Re: (Help) How to drive a Coherent Diode

Hello: Bluefan can you share a little bit more about what regulator or method you are going to use to power it up?

Last edited by wee40811; 09-10-2011 at 09:40 PM.
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Old 09-12-2011, 09:49 PM #4
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Default Re: (Help) How to drive a Coherent Diode

I'll post a circuit diagram of my ideas here shortly.
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Old 09-16-2011, 10:17 AM #5
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Default Re: (Help) How to drive a Coherent Diode

My idea is in the attachment. You should be able to find the proper resistor values yourself. I included an SCR for overvoltage protection, I'm not sure if I placed that one right. The rest should work, I've built a diver like this before, but I didn't test it thoroughly though.
edit: The mosfet I took in the circuit is probably not the mosfet you want,just pick a suitable one. V1 is the high current power source, V2 is only for the opamp.
Attached Thumbnails
(Help) How to drive a Coherent Diode-ld_bar_drive.jpg  
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Highlights of my laser collection:
Big Sky Er:YAG - HP 8168D 1480-1570nm tunable laser source - Spectra Physics 3800 modelocked Nd:YAG - lots of IR diodes and bars - LPC-815 200mW 650nm - DL 6353TL 635nm 5mW - HP5501A stabilized HeNe - 2x Melles Griot 05-STP-910 stabilized HeNe - Spectra Physics 3500 Dye laser - REO 30536 543nm 2mW - Coherent DPY315-100 532nm 100mW SLM DPSS - Lexel 85 - 3x B&W tek 10mW 473nm - 445nm 3W Bluefan Sabre module - SF-AW210 150mW 405nm - DPSS inc 355nm 100mW Q-switched

Power meters:
Laser precision RkP-575 w/ RK-5710 - Ophir 10A-V2-SH - Ophir OEM 20C-A - HP 8152A w/ 2x 81521B - Coherent 212 - Anritsu ML93 w/ MA98A - 2x laser precision AM-400 - Leader LPM-8000


Last edited by Bluefan; 09-16-2011 at 02:46 PM.
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Old 09-17-2011, 01:21 AM #6
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Default Re: (Help) How to drive a Coherent Diode

Quote:
Originally Posted by Bluefan View Post
My idea is in the attachment. You should be able to find the proper resistor values yourself. I included an SCR for overvoltage protection, I'm not sure if I placed that one right. The rest should work, I've built a diver like this before, but I didn't test it thoroughly though.
edit: The mosfet I took in the circuit is probably not the mosfet you want,just pick a suitable one. V1 is the high current power source, V2 is only for the opamp.
Thank you very much
I will look at it!!
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Old 09-22-2011, 03:51 PM #7
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Default Re: (Help) How to drive a Coherent Diode

I Purchased a 12w Coherent Diode on ebay. I want to pulse the light. I need a power supply for this application. Could one use one of 10 farad car stereo capacitor pack, use a mosfet switch to keep the capacitors charged in the 2v range for the desired requirement? In pulse mode, does the Coherent diode laser need any current between pulses?
Thank you.
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Old 01-07-2013, 04:05 AM #8
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Default Re: (Help) How to drive a Coherent Diode

This is a very old thread, but I am interested in pulsing a FAP800 800nm diode too, does anyone know if these does are normally used on and off or continuous? Any idea if these can be used continuous duty cycle or hours at a time?
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Old 01-07-2013, 01:02 PM #9
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Default Re: (Help) How to drive a Coherent Diode

Quote:
Originally Posted by Wadsworth View Post
This is a very old thread, but I am interested in pulsing a FAP800 800nm diode too, does anyone know if these does are normally used on and off or continuous? Any idea if these can be used continuous duty cycle or hours at a time?
You have already opened a Thread asking the same questions.
Coherent FAP800 IR Laser AM Modulation?

No need to dig up an old Thread.

You could have PMed one of the Posters on this Thread instead.


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Old 01-07-2013, 06:44 PM #10
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Default Re: (Help) How to drive a Coherent Diode

Thank you Jerry, I'm never come back. How come you didn't PM me with this instead of making a public complaint? I searched for well over an hour and what I read didn't satisfy my questions, maybe I missed it and it was there to easily find, but I read post after post in string after string on this particular unit and didn't get what I was after. Before you start pulling out your wet noodle to lash out at newbies because you ASSUMED they didn't search, you might try a PM and get your head strait on what is happening.

Last edited by Wadsworth; 01-07-2013 at 07:03 PM.
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Old 01-07-2013, 11:15 PM #11
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Default Re: (Help) How to drive a Coherent Diode

Quote:
Originally Posted by Wadsworth View Post
Thank you Jerry, I'm never come back. How come you didn't PM me with this instead of making a public complaint? I searched for well over an hour and what I read didn't satisfy my questions, maybe I missed it and it was there to easily find, but I read post after post in string after string on this particular unit and didn't get what I was after. Before you start pulling out your wet noodle to lash out at newbies because you ASSUMED they didn't search, you might try a PM and get your head strait on what is happening.
What a Drama Queen.....
Are you mentally unstable....
Do you not understand the written word or what I wrote...

How come you didn't PM me with your question that I have
no answers to ?

I said you were duplicating your question on a 2nd Thread
besides the one you had already opened.
That is called SPAMMING the Forum..

I suggested it may be better to ask your questions to the posters
of this Thread by PM rather than NECROPOSTING...

I did NOT mention anything about NOT SEARCHING...
That was invented by you to get sympahy.

Perhaps no-one knows the answer to your question...

Bye Bye.....Like I told you previously... don't let the
door hit you in the A$$ on the way out...


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Last edited by lasersbee; 01-07-2013 at 11:18 PM.
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Old 01-08-2013, 04:57 AM #12
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Default Re: (Help) How to drive a Coherent Diode

Quote:
Originally Posted by Wadsworth View Post
Thank you Jerry, I'm never come back. How come you didn't PM me with this instead of making a public complaint? I searched for well over an hour and what I read didn't satisfy my questions, maybe I missed it and it was there to easily find, but I read post after post in string after string on this particular unit and didn't get what I was after. Before you start pulling out your wet noodle to lash out at newbies because you ASSUMED they didn't search, you might try a PM and get your head strait on what is happening.
You thought that was rude?!?!

You're not going to last long on this interwebz thing.
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