Laser facets reflectivity calculation from measured optical power

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SUMMARY

The discussion centers on calculating the reflectivity of laser facets based on measured optical power outputs. The front facet emits 120 mW with an assumed reflectivity of 30%, while the back facet emits 10 mW. To determine the back facet's reflectivity, users are encouraged to apply the formula derived from the relationship between output power and reflectivity. Relevant resources include a tutorial on external cavity lasers from Thorlabs and an abstract on semiconductor laser facet reflectivity.

PREREQUISITES
  • Understanding of optical power measurements
  • Familiarity with laser facet reflectivity concepts
  • Knowledge of external cavity laser (ECL) principles
  • Basic mathematical skills for applying reflectivity formulas
NEXT STEPS
  • Research the formula for calculating laser facet reflectivity based on output power
  • Explore the Thorlabs tutorial on external cavity lasers for practical insights
  • Read the abstract on semiconductor laser facet reflectivity for advanced understanding
  • Investigate methods for measuring optical power in laser systems
USEFUL FOR

Optical engineers, laser physicists, and researchers involved in laser technology and reflectivity calculations will benefit from this discussion.

dhirhe
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Hi Every one,

I measured optical output power from both laser facets, front facets emits 120 mW and back facets 10 mW. Assuming front facets reflectivity of 30%(for cleaved facets). What will be the reflective of back facets? Please suggest formula and reference this problem.
 
Science news on Phys.org
This external cavity (ECL) tutorial may provide some insight:
http://www.thorlabs.de/tutorials.cfm?tabID=24960

Here is an abstract for "Method of Determining Semiconductor- Laser Facet Reflectivity after Reflectance Modification": http://www.nsa.gov/research/tech_transfer/fact_sheets/laser_facet_reflectivity.shtml
 

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