Zom-B
0
- Joined
- Mar 25, 2008
- Messages
- 895
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- 28
And mode-shifting, while varying the input current with a variable PSU (use additional lens so not to dislodge the glued lens)IgorT said:It's an electronics problem Dave. You may not see it, but the 75mW limit is physically impossible with a fully working driver. And the driver is the only thing keeping the current constant, and the power somewhat constant.
And it is possible to check for regulation without taking the laser appart. I described how in my previous post - the current is measured and the input voltage varied. If the driver is in regulation, the current will stay the same. Since this is a linear driver, the current can be measured between the PSU and the laser.
And i only recommended a driver transplant IF there is a problem - as in the driver not being in regulation / a blown capacitor bypassing current / random unknown problem. If so, it invalidates the tests done so far anyway.
If we do the testing after Europe, we have to repeat everything. The problem can be tested for without invalidating the testing by:
- Measuring the power
- Changing the temperature of the laser, and remeasuring the power
- Observing the beam profile for mode-hopping
- Measuring the current, while varying the input voltage from a variable PSU
- I don't know how to check for a blown cap (which could bypass some current even if the driver was regulating), without opening the laser, however Kenom's first power measurement would show this.
All of this can be done by Kenom.
I'm hoping you have a variable PSU, Kenom?