Time-resolved measurement of thermally induced aberrations in a cryogenically cooled Yb:YAG slab with a wavefront sensor

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• 作者：P. Sikocinski ; O. Novak ; M. Smrz ; J. Pilar ; V. Jambunathan…
• 刊名：Applied Physics B: Lasers and Optics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：122
• 期：4
• 全文大小：1,811 KB
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• 作者单位：P. Sikocinski (1) (2)
  O. Novak (1)
  M. Smrz (1)
  J. Pilar (1) (2)
  V. Jambunathan (1)
  H. Jelínková (2)
  A. Endo (1)
  A. Lucianetti (1)
  T. Mocek (1)
  
  1. HiLASE Centre, Institute of Physics AS CR, Za Radnicí 828, 252 41, Dolní Břežany, Czech Republic
  2. Czech Technical University in Prague, Břehová 7, 11519, Prague 1, Czech Republic
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Electromagnetism, Optics and Lasers
  Physical Chemistry
  Laser Technology and Physics and Photonics
  Quantum Optics, Quantum Electronics and Nonlinear Optics
  Optical Spectroscopy and Ultrafast Optics
  Physics and Applied Physics in Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0649

文摘

The time-resolved measurements of thermally induced wavefront aberrations in a cryogenically cooled Yb:YAG crystal are presented in dependence on temperature in the range between 250 and 130 K under non-lasing condition. A wavefront sensor was utilized to determine the wavefront aberrations. The wavefront distortions were experimentally studied for a cryogenically cooled Yb:YAG crystal in detail for the first time. The wavefront aberrations were significantly reduced at cryogenic temperatures including defocus which was the dominant aberration and which was responsible for the so-called thermal lensing effect. We found that defocus aberration is caused not only by thermally induced effects (responsible for thermal lens), but also by electronically induced change in the refractive index due to excitation of ion activators which is responsible for the electronic lensing. Nevertheless, at pumping intensity of 6.3 kW/cm2 and repetition rate of 100 Hz thermal effects were the dominant one. In addition, an improvement in the Strehl ratio along with an increase in absorbed pump energy was observed while the temperature of the gain medium was decreased. The measurements clearly show the advantages of cryogenic cooling of laser-active media for beam quality improvement.