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Yang W.,National Key Laboratory of Solid State Laser Technology | Bi G.,National Key Laboratory of Solid State Laser Technology | Mao X.,National Key Laboratory of Solid State Laser Technology | Yan X.,China Institute of Technology | And 4 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2010

Laser synthesis aims at synthesising a number of discrete laser beams into a coaxial beam to achieve higher output power which is several times of that of a single laser to achieve the higher output power. A novel hollow beam convertor is designed, which can be used in N (N ≥ 3) way coaxial laser beam synthesis, and the numerical calculation and experimental study are done. Using this technology in the three-beam synthesis, laser synthesis efficiency is 89%, the time jitter is no more than 2 ns, laser pulse-width reaches about 10 ns (FWHM), and laser beam divergence angle is no more than 2 mrad.


Xu L.,National Key Laboratory of Solid State Laser Technology | Yang P.,CAS Chengdu Institute of Optics and Electronics | Liang X.,National Key Laboratory of Solid State Laser Technology | Wang C.,National Key Laboratory of Solid State Laser Technology | And 4 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2011

High power and good beam quality of solid laser has potential applications in modern industrial processing and scientific research, while the parameters of laser are affected by the dynamic thermal distortion caused by the thermal effect in solid state laser. Taking wave front distortion of the laser and advantage of the conduction cooled end-pumped slab (CCEPS) as a starting point, the wave front distortion caused by thermal effect in the CCEPS is measured by use of Hartmann-Shack wave front detector. By the analysis of results in the measurements of the aberration in the CCEPS, when the output power is different, the dynamic thermal distortion is obtained.


Wang J.,National Key Laboratory of Solid State Laser Technology | Wang J.,China Electronics Technology Group Corporation | Zou Y.,China Electronics Technology Group Corporation | Zhao S.,China Electronics Technology Group Corporation | And 3 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2010

A multiple diode-arrays side-pumped two-rod series connection four-mirror resonator in which has a telescope system has been demonstrated. Using two acousto-optic Q-switches and the intra-cavity frequency doubling of LBO crystal, up to 105 W output at 695.5 nm with the repetition rate of 10 kHz is obtained by resonant cavity and frequency doubling systal parameters optimal design; the optical-to-optical conversion is up to 6.6%.


Chen S.,National Key Laboratory of Solid State Laser Technology | Chen S.,North China Research Institute of Electro Optics | Zhou S.,National Key Laboratory of Solid State Laser Technology | Zhou S.,North China Research Institute of Electro Optics | And 6 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2010

The experimental results of continuous laser diode pumped Nd:YVO4 ring cavity configuration single frequency laser are reported. To reduce the influence of heat effect in laser, a new pump configuration is designed and better results are achieved. At room temperature, 1064 nm single frequency laser with the power up to 9.9 W is obtained from pump power of 22.5 W. Optical-optical conversion efficiency is about 44.1%. Beam quality is Mx 2=1.14 and My 2=1.12. Frequency excursion is 83.7 MHz in one minute. Instability of output power is less than 0.5% in 7 h.


Liu L.,National Key Laboratory of Solid State Laser Technology | Liu Y.,National Key Laboratory of Solid State Laser Technology | Zhang K.,National Key Laboratory of Solid State Laser Technology | Tang X.-J.,National Key Laboratory of Solid State Laser Technology | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Coherent combination of multiple laser amplifier is an important technique for high power and high beam quality laser. Laser amplifier uses master oscillator power amplifier (MOPA) configuration for narrow bandwidth and high beam quality laser. Then active phase control is used to make multiple laser amplifier phase synchronization for coherent spot in the far field. The center spot is N times brighter than the one of incoherent combination. At present, researchers have used this method to achieve 1.56kW coherent combination of nine fiber lasers and 105kW of seven slab lasers. The phase noise of the laser amplifier is an important factor affecting the coherent combination. There are two key technologies in the coherent combination. The one is fill factor of multiple laser spatial distribution, which determines main lobe energy of coherent spot. And the other is the phase noise of the laser amplifier, which decides stability of the coherent combination. The phase noise of laser amplifier is caused by many factors, mainly thermal disturbance and mechanical vibration. Due to the complexity of the phase noise generation, the research on phase noise is generally concentrated in the qualitative analysis. The phase noise is generally considered the time phase noise. It is phase dithering from variation refractive index by external disturbance. A variety of factors, such as temperature changes, mechanical vibrations, the pump power, affect phase noise. We establish an externally imposed discrete disturbance source on fiber laser amplifier and then analyze above-mentioned factors independently and quantitatively by the method. The experiments demonstrate space phase noise, dithering of beam direction, is simultaneously induced by either mechanical vibration or thermal disturbance. This experiment is significant for understanding mechanism of the phase noise and suppression of phase noise. © 2013 SPIE.


Chen S.-B.,National Key Laboratory of Solid State Laser Technology | Chen S.-B.,North China Research Institute of Electro Optics | Zhou S.-H.,National Key Laboratory of Solid State Laser Technology | Zhou S.-H.,North China Research Institute of Electro Optics | And 7 more authors.
Guangxue Jishu/Optical Technique | Year: 2010

The single-frequency Nd:YVO4 laser with a CW laser-diode end-pumped and a simple bow-tie ring cavity configuration is described. When the incident pump power is 25.4W, the single-frequency output power of 7.7W is obtained from the Nd: YVO4 laser at 1064nm, the optical-optical efficiency is 30.3% with beam quality is Mx 2= 1.15 and My 2 = 1.18. The fluctuation of power is about 1% for three hour.

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