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Old 03-29-2014, 08:26 AM #1
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Default 1W Beam focused on Ophir head -damaged?

Hi guys!

Today i wanted to measure the power consumption of my beam expander and forgot to check the focus of the laser when measuring the power with my 20C ophir head. I hit it with a realy small spot (~1W@532) for about 5 seconds. How good are the chances that it is damaged now? I canīt tell anything on the surface area, but maybe inside? Readings seem to be ok, but maybe not 100%?


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Old 03-29-2014, 09:50 AM #2
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Default Re: 1W Beam focused on Ophir head -damaged?

If there are no marks it will be fine. I did that with my laserbee when I first started and there are a couple of tiny dots and an extremely small line on the sensor...The ophir has a slightly grey finish which means it wont absorb quite so much of the light, the laserbee in comparision is black. The laserbee wasnt really affected however and I confirmed this later against the ophir.
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Old 03-29-2014, 02:49 PM #3
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Default Re: 1W Beam focused on Ophir head -damaged?

Cool, then it should be fine. Canīt see any marks
Thanks
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Old 03-29-2014, 05:48 PM #4
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Default Re: 1W Beam focused on Ophir head -damaged?

The Ophir sensors have very high damage thresholds compared to hobby LPM's.

If you can't see anything it will be fine.
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Old 03-29-2014, 11:14 PM #5
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Default Re: 1W Beam focused on Ophir head -damaged?

Don't listen to them guys that OPHIR head is trashed now and you can't just throw them away so you should pack it up and send it to me for proper disposal
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Old 03-29-2014, 11:24 PM #6
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Default Re: 1W Beam focused on Ophir head -damaged?

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you should pack it up and send it to me for proper disposal
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Old 03-30-2014, 12:13 AM #7
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Default Re: 1W Beam focused on Ophir head -damaged?

Same problem here. Measured an Hercules 700 with beam expander and a 2W Frankenstein with the same expander (with lenses recoated) with a focused dot for 1-2 sec max before defocusing the beam: now I can see two very tiny black dots ;( . I imagine that measuring a beam hitting those dots may produce a non reliable measurement.
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Old 03-30-2014, 08:57 AM #8
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Default Re: 1W Beam focused on Ophir head -damaged?

Quote:
Originally Posted by Minamoto Kobayashi View Post
Same problem here. Measured an Hercules 700 with beam expander and a 2W Frankenstein with the same expander (with lenses recoated) with a focused dot for 1-2 sec max before defocusing the beam: now I can see two very tiny black dots ;( . I imagine that measuring a beam hitting those dots may produce a non reliable measurement.
To be honest it doesnt really make much difference. As I mentioned I compared my old "slightly dotted " LB 2.5 W to my new ophir and the measured output was almost identical. (Same laser, used after time for cooling). If you are concerned move the laser around on the sensor ie pick a non damaged area for the measurement and compare it. I think there were a couple of mWs difference on a 2.6 W 445...well within the tolerance of the readings anyway.
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100mW 405 PHR
700mW 405

2W 445 C6--link--
+2.3W 445 --link--
+2.5W 445 --link--

190mW 450 --link--
15mW 510nm
5mW 532 --link--
25mW 532 --link--

520mW 638 --link--
1W 638

250mW 650
250mW 780

3000 Lm C8 MTG2 @ 6 A!
Poppas mod 3A --link--
Sipik 98 Cu pill/star mod --link--

Last edited by grainde; 03-30-2014 at 08:58 AM.
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