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Entry  Mon Jul 13 13:59:19 2009, Michelle, Laser, General, NPRO acting up 
    Reply  Mon Jul 13 21:39:11 2009, Michelle, Laser, General, NPRO acting up 
    Reply  Wed Jul 15 10:47:55 2009, Michelle, Laser, General, NPRO acting up 
Message ID: 170     Entry time: Mon Jul 13 21:39:11 2009     In reply to: 169
Author: Michelle 
Type: Laser 
Category: General 
Subject: NPRO acting up 


I'm having some issues with the 495 mW NPRO, or possibly with its power supply. I ran the laser for about 15 minutes at 2 mW while doing some aligning. I closed the shutter to move a mirror, and upon opening the shutter the laser was no longer lasing. The power supply read 0.0 A driving current. I closed the shutter again and checked all connections between the laser and the power supply. All in order. I opened the shutter and turned the dial a bit on the power supply, and lo and behold the current was back up to 0.46 A, the lasing threshold, but still no light coming out.

The drive current jumped around a lot, sometimes to 0.0 A, and even when I put it up to around 0.54 A, which the laser should definitely be lasing at, nothing came out the aperture. The internal laser temperature was normal and not fluctuating. The lab itself is pretty warm today, in the 70s. Unless someone changed the temperature, it felt like the heat was on. I don't think this would have any effect on the laser, but I'm not really sure.

So, I'm going to search for the manual online and see if anyone over at the 40m had problems with this power supply.

 We should get back to trending the lab temperature. I think there are some long standing problems with the HVAC setup. It would help to quantify this.

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