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315M DPSS laser issues, fringe movement
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andrewwayc...@gmail.com
May 18, 2020, 2:29:12 PM5/18/20
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Hi there,
I have a working 315M DPSS laser, with the controller power supply 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 cheapo chinesium diode laser settles just fine in no time. (I converted it to water cooled, but The weird fringe behavior persists 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, is 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
I have a working 315M DPSS laser, with the controller power supply 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 cheapo chinesium diode laser settles just fine in no time. (I converted it to water cooled, but The weird fringe behavior persists 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, is 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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