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Fluorescence Imaging with One-nanometer Accuracy (FIONA)
Published on: September 26, 2014
Toric concave mirror laser resonator with a big Fresnel number
Qin Yingxiong1, Tang Xiahui, Xiao Yu
1Wuhan National Laboratory for Optoelectronics, National Engineering Research Center for Laser Processing, School of Optoelectronics Science and Engineering, Huazhong University of Science and Technology, Hubei, China.
Abstract:
A new type of toric concave mirror laser resonator with a big Fresnel number is presented. The M2 factor of an output laser beam of the new resonator with a Fresnel number of 8.05 is close to that of the plane-concave stable resonator with a Fresnel number of 2.01, the volume of output mode of the new resonator is about four times of that of the plane-concave stable resonator. A 3.2 kW doughnut-like laser beam with an M2 factor of 1.9 is obtained experimentally by using the new resonator on a high-power transverse flow CO2 laser, while the similar laser power with an M2 factor of 7.5 is obtained by using a plane-concave stable resonator with the same Fresnel number. Results show that a toric concave mirror laser resonator can permit operation of the laser with high power and high beam quality mode in the laser with large gain volume.
