I modulates quite nicely!! Not 100% perfect but what can I expect from a china dpss...Originally Posted by FourDee
Wouldn't it be better to tune your lasers for modulated use? Nice work anyway
Senior Member
I modulates quite nicely!! Not 100% perfect but what can I expect from a china dpss...Wouldn't it be better to tune your lasers for modulated use? Nice work anyway
Senior Member
OK so here is the driver, although I'm guessing it will be a bit different for the analog drivers or the 'oem' drivers, since this one is in the enclosure
The pot at the bottom right is the TEC for the crystals.
Bottom center is the pot for the diode TEC.
Bottom left is unknown... it didn't have an effect on diode current whether is was blanked or not, nor did it effect any temperatures.
Top left is the pot to control diode current while it is blanked. I believe it's referred to as '0 bias'?
Top right is also unknown.... it doesn't have any effect on diode current and doesn't seem to effect temperatures at all.
I'm thinking about adding in a flex mod to this driver. I would let the factory driver control the TEC's, and only use the flexmod to drive the diode, thus allowing me to have analog modulation. What do you think?
Creaky Old Award Winning Bastard Technologist
I'm thinking about adding in a flex mod to this driver. I would let the factory driver control the TEC's, and only use the flexmod to drive the diode, thus allowing me to have analog modulation. What do you think?[/QUOTE]
I'd be curious to see if the temperature control interacted with the factory driver when pulsing.
Steve
Senior Member
Wow, that is awesome! Thanks for sharing the pics GooeyGus.
Senior Member
That's great. I did the same thermal tuning to my S-KY blue after I bought it, but I didn't open the pumping chamber. Patience pays off! Great photo of the beam going from IR (red) to blue, I love that.When you close it up, put a desiccant pack in there and seal it well.
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Thanks GG,
the two unknown pots could have something to do with modulation, regulating the ramp of the TEC and diode currents. This would be hardly visible in a `static' test setup but will show up during modulation. - just a thought.
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Yeah that's what I was thinking. I wish I knew what they were so I knew where to set them... I'm sure I've knocked them off of their original settings a bit. I dont have an o-scope to do any modulation tuning, which I'm sure it could really use.
Senior Member
Nice going there! Be warned from burning the optics in these guys at those power levels....If you inspect the pump collimator and the coatings on the yag....say with a 20 or 30X scope you will learn about Scratch/Dig levels. This creates hot spots and abberations... and tends to obliterate A/R coatings...not good either way in the cavity. Enjoy....but in moderation for sake of the laser's health.
You are the only one that can make your dreams come true....and the only one that can stop them...A.M. Dietrich
Senior Member
microscopic dust => hot spots => burnings... so stay clean
Senior Member
Since my blue has a noisy beam I'm tempted to turn the pots and see if I can get an improvement there. Noisy beam means that when a line is scanned it looks like there is 'static' on the line with very bright spots and very dim spots in a random noisy way.
Any ideas on that?
- TEC temp ?
- diode temp?
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