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Old 01-26-2016, 11:14 AM #1
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Default Laser Power Stability (rms)

Hi, simple question, What exactly mean value "Laser Power Stability (rms)" at DPSS laser module?

Please explain as detailed as possible.

Thank you.


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Old 01-26-2016, 02:11 PM #2
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Default

Quote:
Originally Posted by DrSined View Post
Hi, simple question, What exactly mean value "Laser Power Stability (rms)" at DPSS laser module?

Please explain as detailed as possible.

Thank you.
Laser stability means how stable a laser is. For example, a laser with a stability of 10% will not drift more then 10mW's, while a laser with a stability of 1% will not drift more then 1mW

-Alex
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Old 01-26-2016, 04:00 PM #3
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Default Re: Laser Power Stability (rms)

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Originally Posted by Hap View Post
Laser stability means how stable a laser is. For example, a laser with a stability of 10% will not drift more then 10mW's, while a laser with a stability of 1% will not drift more then 1mW

-Alex
A 100mW laser* with those stability numbers will drift no more than you say.

A 1W Laser with a stability of 10% will drift no more than 100mW. It's a percentage of total output.
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Old 01-26-2016, 04:05 PM #4
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Default Re: Laser Power Stability (rms)

Lots of info out there. From good simple explanations to complex white papers. Also, note that it's specified in percentage, %, of the laser power output as pointed out. Here's one source.
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Old 01-26-2016, 04:16 PM #5
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Default

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Originally Posted by diachi View Post
A 100mW laser* with those stability numbers will drift no more than you say.

A 1W Laser with a stability of 10% will drift no more than 100mW. It's a percentage of total output.
Dangit!

-Alex
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Old 01-26-2016, 04:18 PM #6
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Default Re: Laser Power Stability (rms)

Quote:
Originally Posted by Hap View Post
Dangit!

-Alex

Don't sweat it!
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Old 01-26-2016, 04:26 PM #7
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Don't sweat it!
I won't haha.

-Alex
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Old 01-27-2016, 04:56 AM #8
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Default Re: Laser Power Stability (rms)

yes. basically if a laser says ">100mW 5% stability over 4 hours RMS" it means that its guarenteed to output at least 100mW average or better minimum with no more than a deviation of 5% total output power over 4 hours at a consistent ambient room temperature while running with adequate heat-sinking/cooling.
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Old 01-27-2016, 07:08 AM #9
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Default Re: Laser Power Stability (rms)

Mr. kaiser is confusing rms with peak. "5% rms" is COMPLETELY different from "5% peak." A 100mW 5% (rms) stability laser will vary considerably both over 105mW and under 95mW. I'm not going to try to explain rms in one forum post, but the easiest plain-English approximation is "average noise." The google can tell you all about rms if you want to know more.
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Old 01-27-2016, 08:40 AM #10
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Default Re: Laser Power Stability (rms)

Yes and no. You're absolutely right about the nose bit. But on power specifications, if it's listed >100mW, Then that is its minimum output. It should always do more than listed. If it does less at any time, then it is considered defective/mis-calibrated. I do digress and note most of my lab lasers note power and noise separately on their spec sheets. (And I own quite a few) so it's important to check both. I've often seen companies list both power and noise under the same % difference, but not always. For example my GCS-405 notes <2% +\- <0.2%rms total for noise and <4% change in power over 8 hours. Read the specs carefully.
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