FS: Coherent 40W 808nm diode

My 60W diode driver consists of a 7 amp Powerstat variac, a microwave oven transformer with a rewound secondary, three 25A bridge rectifiers in parallel, seven huge capacitors (16,000uF each) and some other various bits of hardware. Due to the linear design it has pretty bad ripple but it does the job and the diode eats CD cases for breakfast

MarioMaster said:

My 60W diode driver consists of a 7 amp Powerstat variac, a microwave oven transformer with a rewound secondary, three 25A bridge rectifiers in parallel, seven huge capacitors (16,000uF each) and some other various bits of hardware. Due to the linear design it has pretty bad ripple but it does the job and the diode eats CD cases for breakfast

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videos or it didnt happen ;d

GooeyGus,

When you say it cuts glass, is that with FAC only, or is that with good focusing?

And, by cuts glass, do you mean to say that glass is machinable with it?

If so, does it take the full 40W, or could I yank the 20W from the DPSS for this use, and let the 40W handle the DPSS instead? (The tiny rods take 40W, the small ones are happy with 100-200W or so, hence the 40W seems a better fit than the 20W.)


MarioMaster,

Ripple shouldn't be a problem with the limited current eaten by a 60W diode. Increase the capacitance to twice what you have (should give decent suppression on a 100A supply), and stick an air coil between the first third and remainder of the reservoir. Also, you may want to snub the rectifiers, or at least stick a small resistor on each leg. Don't forget how easily the higher frequencies can kill a diode, to say nothing of rise times and rail borne noise. Parasitics get relevant at these current levels, and you should really use a regulator.