Efficient Polarized Laser Mirror

Waveguide-mode resonance effects in thin-film layers can be applied to realize an efficient laser mirror. We have demonstrated the application of a high-efficiency guided-mode resonance (GMR) filter as an output-coupling mirror in a dye laser. This simple two-layer device provides polarized output laser light without the use of laser Brewster windows. The experimental value of the mirror reflectance is ~98% at the resonance peak with corresponding laser transmission of ~2%. Similar experiments with an ~50% reflective corrugated-waveguide mirror have been reported in which parasitic lasing via Fresnel bulk reflections occurred simultaneously due to the low value of the mirror reflectance.

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