Crystal or Diode

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09-28-2008, 20:55
Dr Laser

Crystal or Diode

I have a green dpss that made 500mw. Now power dropped to about 150mw. What the best way to determine what part of laserhead is going down. I have exactly the same resonator assembly. But before I will swap it I want to know...maybe it's a diode itself.
09-28-2008, 23:49
mixedgas

Quote:

Originally Posted by Dr Laser

I have a green dpss that made 500mw. Now power dropped to about 150mw. What the best way to determine what part of laserhead is going down. I have exactly the same resonator assembly. But before I will swap it I want to know...maybe it's a diode itself.

start with the TECs, the yag or vandate adsorption curve is very narrow and diodes shift wavelength with temperature about .1 nm per degree c. Often times a shot of component cooler or a ice cube applied to the heat sink can be a excellent diagnostic tool.

Steve
10-04-2008, 00:41
Dr Laser

I realigned the resonator assembly and got about 350mw.
10-04-2008, 19:39
mixedgas

Quote:

Originally Posted by Dr Laser

I realigned the resonator assembly and got about 350mw.

sounds like a graytracked crystal?

Steve
10-10-2008, 02:51
Dr Laser

Dropped back to 150. I took resonator apart and reassemble it. Still 150mw. And it's not like it goes up and down. It's 150 doesn't matter what I do. (Well only difference will make switching TEC polarity:))) TECs are working fine I can feel the temperature difference.
I think like mixedgas said....bad coating. Same as Lasever.
Now I have old PS and head with burned diode. Will try resurrect that with parts from this.