Development of an optical resonator with conical retroreflector for generation of radially polarized optical beam

Masamori Endo

doi:10.1117/12.760570

7 February 2008 Development of an optical resonator with conical retroreflector for generation of radially polarized optical beam

Masamori Endo

Author Affiliations +

Proceedings Volume 6872, Laser Resonators and Beam Control X; 687207 (2008) https://doi.org/10.1117/12.760570
Event: Lasers and Applications in Science and Engineering, 2008, San Jose, California, United States

Abstract

Optical resonator for generation of high-power radially polarized beam is presented. In laser cutting applications, radially polarized beam is advantageous because the beam contacts the cut front always with the highly absorptive p-polarization. The proposed resonator comprises a reflector unit that has three conical faces with polarization sensitive dielectric coating, and an ordinary output coupler. The resonator is compatible with any existing circular mirror standing-wave optical resonators. Numerical simulation shows good polarization selectivity with only 1% of reflectivity difference between p and s polarizations, and M² factor of the output beam is 1.9. No output power degradation is seen compared to the standard spherical mirror resonator. Design and fabrication of the resonator for a 1kW-class commercial cw CO₂ laser is discussed.

Citation Download Citation

Masamori Endo "Development of an optical resonator with conical retroreflector for generation of radially polarized optical beam", Proc. SPIE 6872, Laser Resonators and Beam Control X, 687207 (7 February 2008); https://doi.org/10.1117/12.760570

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