Optics question - laser power sources

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SUMMARY

The discussion centers on the power output of a 532 nm laser used with a Raman tool, specifically questioning whether the power percentage displayed on the control panel scales linearly with actual power output. At 100% power, the laser outputs 25 mW, leading to the inquiry if 50% power corresponds to 12.5 mW. While some systems exhibit linear scaling, this is not universally applicable, and users are advised to verify with the manufacturer or seek expert calibration for precise measurements.

PREREQUISITES
  • Understanding of laser specifications, particularly 532 nm wavelength lasers.
  • Familiarity with Raman spectroscopy and its instrumentation.
  • Knowledge of power measurement techniques for lasers.
  • Experience with calibration methods, including using cameras for power assessment.
NEXT STEPS
  • Research the linearity of laser power output across different models and manufacturers.
  • Learn about laser calibration techniques, focusing on using cameras for power measurement.
  • Investigate the specifications and operational guidelines for the specific Raman tool in use.
  • Contact laser manufacturers for detailed power output characteristics and thresholds.
USEFUL FOR

Optical engineers, laser technicians, and researchers utilizing Raman spectroscopy who require precise laser power management and calibration techniques.

DanielFaraday
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We have a 532 nm laser that we use with our Raman tool. The only power indicator on the control is in the form of a percentage. I know that at 100%, the laser has a power of 25 mW. Does this scale linearly with power percentage? In other words, does 50% power translate to 12.5 mW?
 
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On some systems I'm familiar with, it can be roughly linear within some range, but it's not a rule of thumb I would readily apply for critical applications or for all lasers. There may also be a threshold under which no lasing occurs. You may want to specify what machine you are using exactly (in case someone here is familiar with it), or contact the manufacturer. If you come the point where you need accurate measurement, my colleagues will be happy to help, as this happens to be our specialty.

www.gentec-eo.com
 
You could always measure / calibrate it using a camera, looking at a spot on the wall. (Make sure that the gamma has been corrected for).
 

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