DPSS driver developemnt

[-bart-]

As a rule of thumb 1amp input per Watt outputpower should do for high power pump diodes.
These 808 diodes hardly ever have a forward voltage above 2 volts.

[edison]

20 watt at 2 v will be arround 10amps. I think a little bit more extra wouldn,t hurt so i think 15 amps and 2 volt will do. Thanks guys

[Anthony]

20 watt at 2 v will be arround 10amps. I think a little bit more extra wouldn,t hurt so i think 15 amps and 2 volt will do. Thanks guys

I think thats alittle on the positive side!!!!
20watts of 808 "light" wil take alot more than 10 amps.
Efficientie isn't 100% (Alot of heat)

I personally think you must go more towards 20-25 AMPs @ 2volts

[Solarfire]

I think thats alittle on the positive side!!!!
20watts of 808 "light" wil take alot more than 10 amps.
Efficientie isn't 100% (Alot of heat)

I personally think you must go more towards 20-25 AMPs @ 2volts

Exactly… actually closer to 25A (for driver layout) if you want to have comfortable headroom.

[edison]

Mmm so a 5 watt green has a 50 watt pumpdiode in it?

[Anthony]

I try to explain in dutch....

dutchmode on

Een 20watt pomp diode leverd 20Watt 808 licht.
Dat betekend niet dat hij 20Watt gebruikt.
Alles heeft een efficientie...

Een pomp diode wordt warm.. dit is verloren energie die niet gebruikt wordt voor het uitstralen van het licht.
Dit is dus wel energie die de diode heeft opgenomen maar niet heeft omgezet in licht.

Stel dat de effiecientie van een diode 50% is.. (Voorbeeld getal) dat betekend dan dat voor die 20 watt 808 er 40Watt wordt opgenomen.
Jij moet bij je design uitgaan van het opgenomen vermogen van de diode... Niet uit uitgestraalde licht vermogen.

Dutch mode OFF

[Solarfire]

Mmm so a 5 watt green has a 50 watt pumpdiode in it?

No, as Bart has allready stated "As a rule of thumb 1amp input per Watt of output power should do for high power pump diodes." That means you need 20A minimum, 25A comfortable. This will give you 20W out @ 808nm and around 5W @ 532nm output if it's a well tuned laser.

[edison]

Thanks guys that helps. What about tec to cool the crystal with the second peltier. Any idea,s of amps and watts that the peltier should be?

[laserdj]

Don't know if this info is useful to you but... my 5w 532 laser head came with 2 PSU's.. one 5V 60A and one 12V 29A...

[-bart-]

My design philosophy of such a supply:
At these powers I would suggest a combined psu of 3,3 volts for the diode and a second voltage for the tecs.
The shg-tec should have an H-bridge for heatig/cooling. The tec should be pwm driven for best efficiency.
The pid temp controllers for the tecs should be implemented in a pic with autotune functionality.
A feed forward of the modulation input to the tecs would be ideal to achieve proper modulation response.

A balanced input matched to the ilda output spec.