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Sheng Q.,Tianjin University | Sheng Q.,Key Laboratory of Opto Electronics Information Science and Technology | Ding X.,Tianjin University | Ding X.,Key Laboratory of Opto Electronics Information Science and Technology | And 11 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2010

We report a continuous-wave tunable optical parametric oscillator (OPO) which is intra-cavity pumped by a laser diode (LD) end-pumped Nd:YVO4 laser and utilize a periodically-poled lithim niobate (PPLN) crystal as nonlinear medium. Cavities are carefully designed and intra-cavity pumping schemes are adopted to realize continuous-wave operation. 1406-1513 nm signal output and 3.66-4.1 μm mid-infrared idler output are obtained with the maximum power of 820 mW at 1500 nm and 195 mW at 3.86 μm, corresponding conversion efficiencies versus 10.9 W LD power are 7.5% and 1.8%. 606-624 nm continuous-wave tunable orange-red output is also obtained by intra-cavity sum-frequency generating of 1064 nm pump wave and 1.4-1.5 μm signal wave of the OPO in a BBO crystal. The maximum output power is 120 mW at 624 nm, with conversion efficiency of 1.1%. Source


Sheng Q.,Tianjin University | Sheng Q.,Key Laboratory of Opto Electronics Information Science and Technology | Ding X.,Tianjin University | Ding X.,Key Laboratory of Opto Electronics Information Science and Technology | And 19 more authors.
Journal of Optics (United Kingdom) | Year: 2014

A frequency-doubled Nd:YVO4 self-Raman laser in-band pumped by an 878.7 nm wavelength-locked laser diode (LD) is demonstrated, with the purpose of improving the pump absorption of in-band pumping and thus enhancing optical efficiency. 2.64 W average output power at 588 nm is obtained under incident LD power of 9.7 W, corresponding to an optical efficiency of 27.2%. The results of control experiments show that in-band pumping leads to higher conversion efficiency of a self-Raman laser than does traditional pumping. Moreover, the application of a wavelength-locked LD further improves optical efficiency significantly. © 2014 IOP Publishing Ltd. Source


Sheng Q.,Tianjin University | Sheng Q.,Key Laboratory of Opto Electronics Information Science and Technology | Ding X.,Tianjin University | Ding X.,Key Laboratory of Opto Electronics Information Science and Technology | And 13 more authors.
Journal of Optics | Year: 2011

This work demonstrates a tunable continuous-wave (CW) all-solid-state orange-red source based on sum-frequency generation (SFG), using a tunable 1.4-1.5μm signal and a 1064nm pump of an intra-cavity periodically poled LiNbO3 optical parametric oscillator in a BBO (β-BaB 2O4) crystal. Elaborate intra-cavity design ensured efficient CW singly resonant optical parametric oscillator (SRO) operation. Intra-cavity SFG made full use of the high circulating pump and signal power of the SRO under an external laser diode (LD) pump power that was ten times higher than the SRO threshold. The output wavelength tuning range was 605-623nm. The maximum output power was 370mW at 622.8nm with 17.1W LD pump power, corresponding to an overall conversion efficiency of 2.2%. © 2011 IOP Publishing Ltd. Source


Sheng Q.,Tianjin University | Sheng Q.,Key Laboratory of Opto Electronics Information Science and Technology | Ding X.,Tianjin University | Ding X.,Key Laboratory of Opto Electronics Information Science and Technology | And 13 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

We report a pulsed, widely tunable Ti:sapphire laser pumped by an all-solid-state Q-switched intra-cavity frequency-doubled Nd:YAG laser with repetition rate of 7 KHz. Using two dense flint glass prisms as dispersion elements, the output wavelength could be continuously tuned over 675-970 nm, with spectral line-width of 2 nm. Gain-switching characteristics of Ti: sapphire laser shortened the pulse width to 17.6 ns. Well mode matching between pump and laser beam in the sapphire crystal and thermal design of the cavity ensured stable, efficient laser operation. The maximum output power was 6.2 W at 780 nm when the 532 nm pump power was 22 W; corresponding conversion efficiency was 28.2%. © 2010 Copyright SPIE - The International Society for Optical Engineering. Source


Li B.,Tianjin University | Li B.,Key Laboratory of Opto Electronics Information Science and Technology | Yao J.,Tianjin University | Yao J.,Key Laboratory of Opto Electronics Information Science and Technology | And 6 more authors.
Optics Communications | Year: 2010

High efficiency extra-cavity third harmonic generation (THG) of 355 nm has been developed. A laser diode (LD) end-pumped, acoustic-optical Q-switched Nd:YAG laser was used as the fundamental wave source. With an input pump power of 25 W, average power of 6.75 W at 1064 nm was generated with the repetition rate 12 kHz and pulse duration 10 ns. Using the extra-cavity frequency conversion of three critical phase match (CPM) LiB3O5 (LBO) crystals, 3.2 W third harmonic radiation at 355 nm was obtained. The optical-to-optical (1064 nm to 355 nm) conversion efficiency was up to 47.4%. © 2010 Elsevier B.V. All rights reserved. Source

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