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)
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
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.
Received: 10 April 2008
Revised: 31 July 2008
Accepted manuscript online:
(Resonators, cavities, amplifiers, arrays, and rings)
Fund: 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).
Cite this article:
Liu Huan(刘欢), Xu De-Gang(徐德刚), and Yao Jian-Quan(姚建铨) Simultaneous all-solid-state multi-wavelength lasers --- a promising pump source for generating highly coherent terahertz waves 2009 Chin. Phys. B 18 1077
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