中国物理B ›› 2009, Vol. 18 ›› Issue (7): 2806-2815.doi: 10.1088/1674-1056/18/7/031

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Influence of spherical aberrations on fundamental mode beam quality under different laser resonators

胡淼1, 项震2, 葛剑虹2, 赵智刚2, 汪莎2, 刘崇2, 陈军2   

  1. (1)College of Communication, Hangzhou University of Electronic Science and Technology, Hangzhou 310037, China; (2)State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:2008-12-29 修回日期:2009-01-16 出版日期:2009-07-20 发布日期:2009-07-20
  • 基金资助:
    Project supported by the National Natural Science Foundation --the Science Foundation of China Academy of Engineering Physics (NSAF) (Grant No 10876037) and China Postdoctoral Science Foundation (Grant No 20080441238).

Influence of spherical aberrations on fundamental mode beam quality under different laser resonators

Xiang Zhen(项震)a), Hu Miao(胡淼)b), Ge Jian-Hong(葛剑虹)a)†, Zhao Zhi-Gang(赵智刚)a), Wang Sha(汪莎)a), Liu Chong(刘崇)a), and Chen Jun(陈军)a)   

  1. a State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China; b College of Communication, Hangzhou University of Electronic Science and Technology, Hangzhou 310037, China
  • Received:2008-12-29 Revised:2009-01-16 Online:2009-07-20 Published:2009-07-20
  • Supported by:
    Project supported by the National Natural Science Foundation --the Science Foundation of China Academy of Engineering Physics (NSAF) (Grant No 10876037) and China Postdoctoral Science Foundation (Grant No 20080441238).

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摘要： Spherical aberrations of the thermal lens of the active media are severe when solid state lasers are strongly pumped. The fundamental mode profile deteriorates due to the aberrations. Self-consistent modes of a resonator with aberrations are calculated by using the Fox--Li diffraction iterative algorithm. Calculation results show that the aberration induced fundamental mode beam quality deterioration depends greatly on the resonator design. The tolerance of a flat--flat resonator to the aberration coefficient is about 30λ in the middle of stability, where λ is the wavelength of laser beam. But for a dynamically stable resonator, 2λ of spherical aberration will create diffraction loss of more than 40%, if inappropriate design criteria are used. A birefringence compensated laser resonator with two Nd:YAG rods is experimentally studied. The experimental data are in quite good agreement with simulation results.

Abstract: Spherical aberrations of the thermal lens of the active media are severe when solid state lasers are strongly pumped. The fundamental mode profile deteriorates due to the aberrations. Self-consistent modes of a resonator with aberrations are calculated by using the Fox--Li diffraction iterative algorithm. Calculation results show that the aberration induced fundamental mode beam quality deterioration depends greatly on the resonator design. The tolerance of a flat--flat resonator to the aberration coefficient is about 30$\lambda$ in the middle of stability, where $\lambda$  is the wavelength of laser beam. But for a dynamically stable resonator, 2$\lambda$ of spherical aberration will create diffraction loss of more than 40%, if inappropriate design criteria are used. A birefringence compensated laser resonator with two Nd:YAG rods is experimentally studied. The experimental data are in quite good agreement with simulation results.

Key words: spherical aberration, fundamental mode beam quality, diffraction loss, resonators design

中图分类号:  (Chromatic and geometrical aberrations)

  • 41.85.Gy
42.60.Da (Resonators, cavities, amplifiers, arrays, and rings) 42.79.Bh (Lenses, prisms and mirrors) 42.55.Rz (Doped-insulator lasers and other solid state lasers) 42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation) 42.60.By (Design of specific laser systems)