Compact efficient optical parametric generator internal to a Q-switched Nd:YVO4 laser with periodically poled MgO:LiNbO3
Ji Feng(纪峰)a) b)†, Yao Jian-Quan(姚建铨)a) b), Zhang Bai-Gang(张百钢)a) b), Zhang Tie-Li(张铁犁)a) , Xu De-Gang(徐德刚)a) , and Wang Peng(王鹏)a)
a College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Optoelectronics, Tianjin University, Tianjin 300072, China; b Key Laboratory of Optoelectric Information Science and Technology, Ministry of Education, Tianjin University, Tianjin 300072, China
Abstract This paper demonstrates a compact efficient optical parametric generator internal to a Q-switched diode-end-pumped Nd:YVO$_{4}$ laser with periodically poled MgO:LiNbO3(PPMgLN). With the Q-switch set at a repetition rate of 25kHz and the PPMgLN crystal operated at room temperature (25℃), the intracavity optical parametric generator threshold was reached as a diode pump power of 0.9 W. A maximum signal output power of 0.34W with a pulse width of 25 ns and a beam quality factor of 1.4 was obtained at an incident diode power of 3.4 W, leading to a conversion efficiency of 10%with a slope efficiency of 14.4%. By varying the crystal temperature from 25 to 200℃, the output signal wavelengths were tuned in range of 1506--1565 nm. Over a 30-minutes interval, the instability of the signal power was measured to be less than 1%. In addition, the threshold pump intensity for the intracavity optical parametric generator is theoretically investigated, and the obtained result is in good agreement with the experimental results.
Received: 15 June 2007
Revised: 21 August 2007
Accepted manuscript online:
(Parametric down conversion and production of entangled photons)
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10474071 and
60671036).
Cite this article:
Ji Feng(纪峰), Yao Jian-Quan(姚建铨), Zhang Bai-Gang(张百钢), Zhang Tie-Li(张铁犁), Xu De-Gang(徐德刚), and Wang Peng(王鹏) Compact efficient optical parametric generator internal to a Q-switched Nd:YVO4 laser with periodically poled MgO:LiNbO3 2008 Chin. Phys. B 17 1286
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