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A Polarization-Independent Pulsed-Laser Energy Monitoring System with Analog Readout

Volume 26, Number 1 (Feb. 1972) Page 100-102

Piepmeier, E.H.

Laser beam monitors commonly use a single optical plate placed at an angle to the beam to divert a fraction of the laser beam to a detector. If the beam is not polarized or is polarized in one direction only, the use of a single plate causes no sampling error for an energy measurement. However, if different lasing modes have different polarizations, each mode may be reflected to a different extent due to the nonzero angle of incidence. For instance, Fresnel's laws of reflection predict that a glass plate with a refractive index of 1.55 at a 45° angle of incidence reflects 10.4% of parallel polarized light and 1.1% of perpendicularly polarized light at each surface, assuming that the reflections at the two surfaces of the plate do not interfere with each other.