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high efficient C6H12 Raman Laser Enhanced by DCM Fluorescence

Chinese Physics Letters 2007年第1期24卷 119-122页

作者：王宏波梁慧敏王治华罗时荣杨经国郑万国魏晓峰贺少勃陈远斌 Department of Physics Sichuan University Chengdu 610064 Research Center of Laser Fusion China Academy of Engineering Physics Mianyang 621900

We report the first-order Stokes output （wavelength of 627.6 nm） from C6H12 enhanced by DCM dye fluorescence with high energy conversion efficiency of 47.9%, quantum conversion efficiency of 56.5%. To our knowledge, it is the highest conversion efficiency of stimulated Raman scattering obtained from liquid Raman laser. A 532nm frequency doubled Nd：YAG laser with 8 Hz repetition rate is employed as the pump source, and the enhancement medium is DCM dye solution in ethanol. The conversion efficiencies at various pump energies and various pump repetition rates are measured and analysed. The enhancement mechanism of SRS together with its potential application is discussed.

关键词： high efficient C_6H_(12) Raman Laser DCM Fluorescence

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Feedback analysis and design of inductive power links driven by Class-E amplifiers with variable coupling coefficients

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第8期11卷 629-636页

作者： Tian-liang YANG Chun-yu ZHAO Da-yue CHEN Institute of Intelligent Mechatronics Research School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China

The efficiency of inductive power links driven by Class-E amplifiers may deteriorate due to variation in the coupling coefficient when the relative position of the radio frequency (RF) coils *** solve this problem,a new design methodology of power links is presented in this *** aim of the new design is to use the feedback signal,which is a phase difference between the driving signal and the output current of the Class-E amplifier,to adjust the duty cycle and angular frequency of the driving signal to maintain the optimum state of the inductive power link,and to adjust the supply voltage to keep the output power constant when the coupling coefficient of the RF coils *** parameter adjustments with respect to the coupling coefficient and the feedback signal are derived from the design equation of the inductive power *** validate the feedback control rules,a prototype of the inductive power link was constructed,and its performance validated with the coupling coefficient set at 0.2 and a duty cycle of *** experimental results showed that,by adjusting the duty cycle,the angular frequency,and the supply voltage,the power link can be kept in optimal operation with a constant output power when the coupling coefficient changes from 0.2 to 0.1 to 0.25.

关键词： Inductive power link Closed-loop Class-E amplifier high efficient Variable coupling coefficient

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