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Tm：Ho：YLF Amplifiers at 2.049 μm with a Tm：Ho：GdVO4 Oscillator

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Chinese Physics Letters 2005年第6期22卷 1409-1412页

作者：贺万骏姚宝权鞠有伦王月珠李玉峰杨峰 nationalkeylaboratoryoftunablelasertechnology HarbinInstituteofTechnologyHarbin150001

We report cw diode-pumped cryogenic Tm:Ho:YLF amplifiers at 2.049μm with a Tm:Ho:GdVO4 oscillator. Not only the single- and double-pass, but also the single- and double-end pump amplifiers with a 10-mm-length medium are compared. A measured maximum small-gain coefficient of 1.3cm−1 is achieved for the double-pass and double-end pump amplifier. The maximum extracted power of 8.5W, the gain of 3.2 and extracted efficiency of 32% have been obtained with an input signal power of 3.9W. The difference of the hosts in the oscillator and amplifier has little influence on the characteristic of the amplifier output. Additionally, the extracted efficiency of the quasi-continuous-wave amplifier with a repetition rate of 10kHz is the same as the cw one.

关键词： OPOs OPAs LD

High Efficiency Continuous-Wave Tm：Ho：GdVO4 Laser Pumped by a Diode

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Chinese Physics Letters 2004年第11期21卷 2182-2183页

作者：姚宝权贺万骏王月珠张兴宝李玉峰 nationalkeylaboratoryoftunablelasertechnology HarbinInstituteofTechnologyHarbin150001

We report a high efficiency cw diode-pumped cryogenic Tm(5at.%), Ho(0.5at.%):GdVO4 laser. The pumping source is a fibre-coupled laser diode with fibre core diameter of 0.4mm and numerical aperture of 0.3, supplying power 14.8W at 793.6nm. For input pump power of 13.6W at 794.2nm, the maximum output power of 4.2W, optical-to-optical conversion efficiency of 31% and slope efficiency 38% have been attained at 2.0485μm. To our knowledge, the operating performance is the best among the previously reported Tm:Ho:GdVO4 lasers. We also analyse the influence of pump wavelengths (from 792nm to 794.2nm) on the output power, the optical-to-optical conversion efficiency increases with the longer pump wavelength which is closer to the absorption peak of 797nm in Tm,Ho:GdVO4.

关键词： Conversion efficiency

Experimental study of conversion from atomic high—order harmonics to x—ray emissions

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Chinese Physics B 2003年第5期12卷 524-527页

作者： WangQi ChenJian-Xin XiaYuan-Qin ChenDe-Ying nationalkeylaboratoryoftunablelasertechnology HarbinInstituteofTechnologyHarbin150001China

There are two physical phenomena in a strong laser intensity. One is the high-order harmonic emission; the other is x-ray emission from optical-field ionized plasmas. The experiment of conversion from high-order harmonics to x-ray emissions was given with a 105fs Ti:sapphire laser by adjusting laser intensities. The ingredient in plasma was investigated by the numerical simulations. Our experimental results suggested that the free electrons have detrimental effects on harmonic generation but are favourable for x-ray emission from optical-field ionized plasmas. If we want to obtain more intense harmonic signals as a coherent light source in the soft x-ray region, we must avoid the production of free electrons in plasmas. At the same time, if we want to observe x-rays for the development of high-repetition-rate table-top soft x-ray lasers, we should strip all atoms in the plasmas to a necessary ionized stage by the optical-fieldionization in the field of a high-intensity laser pulse.

关键词： high-order harmonic x-ray emission experimental conversion

Mathematical modelling of gain-switched RF-excited CO2 waveguide laser

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Chinese Physics B 2004年第4期13卷 501-504页

作者：巴德田兆硕王骐 nationalkeylaboratoryoftunablelasertechnology HarbinInstituteofTechnologyHarbin150001China

The detailed mathematical models for the evolution of light pulses in RF-excited CO2 waveguide lasers are derived.Explicit expressions for the pulse characteristics in RF-excited CO2 waveguide lasers are obtained. The... 详细信息

关键词： mathematical modelling gain-switched RF excited CO2 waveguide lasers