Gryphon
0
- Joined
- May 4, 2009
- Messages
- 2,328
- Points
- 113
I'm trying to repair a DPSS green laser with a blown pump diode. The original diode had a FAC so I ordered a 3W 808nm C-mount diode with FAC from LaserLands. I don't know what power the original diode was but after measuring a drive current of 2.2A, a 3W diode seemed like a safe bet.
The diode was easy enough to replace and powers up just fine but the green output is less than stellar. With 440mW of pump output I get 40mW of green and with 2W of pump output I get 150mW of green. Thats 9% conversion efficiency on low power and 7% conversion efficiency in high power.
I played with the pump polarization by rotating the top of the module that holds the crystals and that's the most green output I could get. After measuring the wavelength of the diode its producing 810nm @ 440mW and 813nm @ 2W. Is it safe to assume that the wavelength shift away from 808nm is the main culprit for the terrible conversion efficiency?

The diode was easy enough to replace and powers up just fine but the green output is less than stellar. With 440mW of pump output I get 40mW of green and with 2W of pump output I get 150mW of green. Thats 9% conversion efficiency on low power and 7% conversion efficiency in high power.
I played with the pump polarization by rotating the top of the module that holds the crystals and that's the most green output I could get. After measuring the wavelength of the diode its producing 810nm @ 440mW and 813nm @ 2W. Is it safe to assume that the wavelength shift away from 808nm is the main culprit for the terrible conversion efficiency?