Easy to build Peltier cooling for Osram PL530

Holography related topics.
vasimv
Posts: 58
Joined: Tue Apr 23, 2019 2:16 am

Easy to build Peltier cooling for Osram PL530

Post by vasimv »

The Osram PL530 (DPSS laser module) is cheap and has very good beam quality but quite hard to run properly. After some unsuccessful attempts and one destroyed module i've found the laser is very sensitive to temperature and requires quite precise cooling. So, i've started to build cooling/powering system for it from ready parts, with minimal soldering.

The system has microcontroller (Heltec ESP32 WiFi LoRa module), DPS3005 step-down module, GY-39 sensor (to control environment's temperature, humidity, pressure and illumination), thermistor and small 5V step-down for microcontroller power. Later i plan to add one more DPS3005 module to be able slowly power-up laser's power regulators (somehow my PL530 doesn't want to start with full power and i have to reduce its current to zero and slowly increase it to get beam), and shutter servo. WiFi is used to provide small web-interface to see environment's conditions and current peltier's status.

If anyone is interested, i can make detailed instructions and firmware.
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soda
Posts: 38
Joined: Mon Oct 08, 2018 4:05 am

Re: Easy to build Peltier cooling for Osram PL530

Post by soda »

Great!
I have designed analog driver for PL530 include peltier driver, but currently I have no time to produce complete lasers... see for
inspiration:
viewtopic.php?f=11&t=9912&start=30
The PPLN heater is very sensitive part of PL530, when driven to constant resistance the sensitivity to base temperature is greatly reduced. It can be damaged by overheating of the PPLN. The laser diode can be damaged by current spikes instantly, do not use switching regulators!
vasimv
Posts: 58
Joined: Tue Apr 23, 2019 2:16 am

Re: Easy to build Peltier cooling for Osram PL530

Post by vasimv »

soda wrote: Fri Nov 08, 2019 1:24 pm I have designed analog driver for PL530 include peltier driver, but currently I have no time to produce complete lasers... see for
inspiration:
viewtopic.php?f=11&t=9912&start=30
Yes, looks good but i was too lazy to make PCB. And i have good experience in using MCUs for that kind of regulation, so i've decided to create MCU's controlled module from ready parts. It has some restrictions because ESP32's not really good ADC and slow working DPS3005 (can change output only two times per second or less) but still has +/- 0.1C precision.
soda wrote: Fri Nov 08, 2019 1:24 pm It can be damaged by overheating of the PPLN. The laser diode can be damaged by current spikes instantly, do not use switching regulators!
Yeah, i found that already. :) But don't have analog current regulator ready, so using switching one with simple capacitor close to laser as filter. Will add LC filter later.
John Klayer
Posts: 273
Joined: Thu Jan 08, 2015 2:28 am

Re: Easy to build Peltier cooling for Osram PL530

Post by John Klayer »

Here's the PL530 that Soda built for me:
Image
frozone
Posts: 5
Joined: Sat Dec 07, 2019 5:50 pm

Re: Easy to build Peltier cooling for Osram PL530

Post by frozone »

That’s amazing. Soda I’d definitely be down to pay for your time to build a whole laser when you get freed up again.
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