Topic: 200mW DPSSFD Labby not behaving well to modulation

[dtewksbury]

G'Day, yeah I just had to say it some time, everyone expects that.

Anyway I have a 200mW 532 Lab laser that doesn't modulate very well, I know this is like the post before, but this laser does have analog modulation input. It does work, but not very well. If I apply 5 volts to the modulation input it goes to full power but only after about a minute.

To me this seems like the TEC might be faulty and it is either the 1064 heating the FD or the 808 hitting the YAG causing the heating.

Now I am asking all this because I am planning on disassembling it to check it out, but before I do I though I should check.

If I modulate it it responds OK up until just before half way (~2.5V), then it dips a bit, then it blast up to full power. This is using a slow ramp (over 1 second or so).

If it is quickly modulated (like in a laser image), it is ok down low, but flat spots in the middle, and won't do full power on the peaks.

When run continuously with 5V on the modulation input it does get to 200mW.

[James]

So your name's not Bruce then?

Well that's going to cause a bit of confusion!

Mind if we call you Bruce? 

James. 

[dtewksbury]

Who's Bruce?

[James]

http://www.youtube.com/watch?v=_f_p0CgPeyA

James.  

[dtewksbury]

OK then, I guess I must be Bruce.

[James]

I guess I'd never make it there.

No Puff-das !

James. 

[dtewksbury]

Was it really like that back then? Although they are English, who knows what they were thinking.

[James]

I just always picture Australia as a mix between that and Mad Max ~ Road Warrior.

Isn't that pretty much correct? 

James. 

[dtewksbury]

That's funny. It's always interesting what people think Australia is like, and no. It is the best place in the world as far as I can tell, and have seen, but I haven't been to the states yet, may get there next year.

[James]

Did you see this?

http://akrobiz.com/laserboy/forum/index.php/topic,300.msg3552.html#new

Looks like you guys should put your heads together.

I love Ohio for the land and the climate. The people are fine in general, if you're in the right places.

So how's your day? 

James. 

[dtewksbury]

Did you see this?

http://akrobiz.com/laserboy/forum/index.php/topic,300.msg3552.html#new

Looks like you guys should put your heads together.

Yes I did see that, mmmm.

Our welfare system works ok, nobody loses it, no matter how long they are out of work. I don't mind my tax dollars going towards it either because it keeps most people off the streets and we end up with a relatively safe living environment. Yes you do get people who abuse it, but it's better than the alternative.

[BlinkenLights]

WOuld you PLEASE STOP THREADJACKING EVERYONE JAMES ! ! ! ! ! ! ! ! !

i have 2 150mw greens that both have bad IR diodes..

[dtewksbury]

How did the diodes die?

Have you tried replacing them, are they lab style lasers?

[BlinkenLights]

both labbys both TTL and both dies because i messed with them.

[James]

Does it not make sense then to get the cheapest bits for a green laser and put them all together the right way?

How easy is it to take them apart and use the pieces?

James.