中国物理B ›› 2009, Vol. 18 ›› Issue (3): 1077-1084.doi: 10.1088/1674-1056/18/3/040

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Simultaneous all-solid-state multi-wavelength lasers --- a promising pump source for generating highly coherent terahertz waves

徐德刚1, 姚建铨1, 刘欢2   

  1. (1)Institute of Laser and Optoelectronics, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China; (2)Institute of Laser and Optoelectronics, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China;Center for Photonics and Electronics, State Key Laboratory of Tribology, Department of Precision Instrument
  • 收稿日期:2008-04-10 修回日期:2008-07-31 出版日期:2009-03-20 发布日期:2009-03-20
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No 2007CB310403) and the Tianjin Municipal Primary application and Frontier Technology Research Plan, China (Grant No 07JCYBJC06200).

Simultaneous all-solid-state multi-wavelength lasers --- a promising pump source for generating highly coherent terahertz waves

Liu Huan(刘欢)a)b), Xu De-Gang(徐德刚)a)†, and Yao Jian-Quan(姚建铨)a)   

  1. a Institute of Laser and Optoelectronics, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China; b Center for Photonics and Electronics, State Key Laboratory of Tribology, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
  • Received:2008-04-10 Revised:2008-07-31 Online:2009-03-20 Published:2009-03-20
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No 2007CB310403) and the Tianjin Municipal Primary application and Frontier Technology Research Plan, China (Grant No 07JCYBJC06200).

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摘要： A diode-end-pumped Nd:YAG dual-wavelength laser operating at 1319 and 1338 nm is demonstrated. The maximum average output power of the quasi-continuous wave linearly polarized dual-wavelength laser is obtained to be 2.1 W at a repetition rate of 50 kHz with an output power instability of less than 0.38% and beam quality factor M2 of 1.45. Using the two lines, the highly coherent and narrow linewidth terahertz radiation of 3.23 THz can be generated in an organic 4-N, N-dimethylamino--methyl-stilbazolium tosylate (DAST) crystal. Meanwhile, the multi-wavelength red laser at 659.5, 664 and 669 nm is generated by frequency doubling and sum frequency processes in a lithium triborate (LBO) crystal. The average red laser output power is enhanced up to 1.625 W at a repetition rate of 15 kHz with an output power instability of better than 0.53% and beam quality factor M2 of 6.05. Using the three lines, it is possible to generate the multi-wavelength THz radiation of 3.3, 3.43 and 6.73 THz in an appropriate difference frequency crystal.

关键词: end-pumped Nd:YAG laser, dual-wavelength laser, acousto-optic Q-switch, terahertz wave

Abstract: A diode-end-pumped Nd:YAG dual-wavelength laser operating at 1319 and 1338 nm is demonstrated. The maximum average output power of the quasi-continuous wave linearly polarized dual-wavelength laser is obtained to be 2.1 W at a repetition rate of 50 kHz with an output power instability of less than 0.38% and beam quality factor M2 of 1.45. Using the two lines, the highly coherent and narrow linewidth terahertz radiation of 3.23 THz can be generated in an organic 4-N, N-dimethylamino--methyl-stilbazolium tosylate (DAST) crystal. Meanwhile, the multi-wavelength red laser at 659.5, 664 and 669 nm is generated by frequency doubling and sum frequency processes in a lithium triborate (LBO) crystal. The average red laser output power is enhanced up to 1.625 W at a repetition rate of 15 kHz with an output power instability of better than 0.53% and beam quality factor M2 of 6.05. Using the three lines, it is possible to generate the multi-wavelength THz radiation of 3.3, 3.43 and 6.73 THz in an appropriate difference frequency crystal.

Key words: end-pumped Nd:YAG laser, dual-wavelength laser, acousto-optic Q-switch, terahertz wave

中图分类号:  (Diode-pumped lasers)

  • 42.55.Xi
42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation) 42.60.Gd (Q-switching) 42.60.Da (Resonators, cavities, amplifiers, arrays, and rings)