Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old May 19th 20, 08:36 PM posted to sci.electronics.repair
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Default 315M Laser fringe issues, help needed...

Hi there,
I have a working 315M DPSS laser, with the controller, power supply, and a weird autostart dongle without the ready light...
I am trying holography again (thanks Fred unterseher) in my livingroom with this new laser, but I think it may be having trouble stabilizing...?
It starts up just fine, but when I run it though the interferometer it performs this “breathing” routine, where the fringe pattern moves a little in a regular manner every 3-4 seconds, contracting in. I have eliminated the possibility of table, pump, or fan movement- as my other cheapo chinesium diode laser settles just fine in no time. (I converted the 315M-100 to water cooling, but the weird fringe behavior persists even with the pump off for 15 mins).
I have tried the recommendations in the laser faq for this model, DC voltage is good/stable, checked all ribbon cable conn’s (visually, as i'd hate to brick it by poking around with a multimeter). I have also tried adjusting the pot down for a lower current/power setting to no avail- it resets and takes its 6mins to find a new stable setting, but the fringes never settle.
I do not have a oscilloscope or power meter handy as of yet, but it seems to be stuck in a loop. Any suggestions would be appreciated!
-Roo

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Old May 26th 20, 04:42 AM posted to sci.electronics.repair
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Default 315M Laser fringe issues, help needed...

On Tuesday, May 19, 2020 at 2:36:20 PM UTC-4, Andrew Way wrote:
Hi there,
I have a working 315M DPSS laser, with the controller, power supply, and a weird autostart dongle without the ready light...
I am trying holography again (thanks Fred unterseher) in my livingroom with this new laser, but I think it may be having trouble stabilizing...?
It starts up just fine, but when I run it though the interferometer it performs this “breathing” routine, where the fringe pattern moves a little in a regular manner every 3-4 seconds, contracting in. I have eliminated the possibility of table, pump, or fan movement- as my other cheapo chinesium diode laser settles just fine in no time. (I converted the 315M-100 to water cooling, but the weird fringe behavior persists even with the pump off for 15 mins).
I have tried the recommendations in the laser faq for this model, DC voltage is good/stable, checked all ribbon cable conn’s (visually, as i'd hate to brick it by poking around with a multimeter). I have also tried adjusting the pot down for a lower current/power setting to no avail- it resets and takes its 6mins to find a new stable setting, but the fringes never settle.
I do not have a oscilloscope or power meter handy as of yet, but it seems to be stuck in a loop. Any suggestions would be appreciated!
-Roo


hmm, no 'scope. I don't know these lasers, but is there both a current
control loop and thermal control? Can you look at those signals?
A few minutes sound like it might be the temperature.

George h.


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