Determining the thermal lens focus of LD end-pumped Nd：GdVO4 solid-state laser with CCD detecting method

ZOU Jing; ZHAO Sheng-zhi; YANG Ke-jian; LI Gui-qiu

In order to study the thermal effect of Nd:GdVO4 crystal in LD end-pumped solid-state laser,a simply method to measure the thermal focal length with stable resonator is presented.By measuring M2 factor and the waist of output beam with CCD beam analyzer,the beam waist of the TEMOO mode can be deduced according to the law of multi-mode Gaussian beam propagation.Based on the ABCD matrix theory of stable resonator,the thermal focal length of the active medium is easily obtained.The experiment shows that the higher the pump power is,the smaller the thermal focal length is,and the worse the thermal effect influent the output beam quality.The thermal focal length of a LD end-pumped Nd:GdVO4 laser is measured and the experimental results agree with the theoretical predication.

Corresponding author: ZHAO Sheng-zhi, shengzhi_zhao@sdu.edu.cn;

1. School of Information Science and Engineering, Shandong University, Ji'nan 250100, China

Received Date: 2005-05-31

Accepted Date: 2005-06-23

Available Online: 2006-07-25

Abstract: In order to study the thermal effect of Nd:GdVO4 crystal in LD end-pumped solid-state laser,a simply method to measure the thermal focal length with stable resonator is presented.By measuring M2 factor and the waist of output beam with CCD beam analyzer,the beam waist of the TEMOO mode can be deduced according to the law of multi-mode Gaussian beam propagation.Based on the ABCD matrix theory of stable resonator,the thermal focal length of the active medium is easily obtained.The experiment shows that the higher the pump power is,the smaller the thermal focal length is,and the worse the thermal effect influent the output beam quality.The thermal focal length of a LD end-pumped Nd:GdVO4 laser is measured and the experimental results agree with the theoretical predication.

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Reference (10)

[1]	NEUENSCHWANDER B,WEBER R,WEBER H P.Determination of the thermal lens in solid-state lasers with stable cavities[J].IEEE J Q E,1995,31(6):1082～1087.
[2]	BROWN D C.Nolinear thermal distortion in YAG rod amplifiers[J].IEEE J Q E,1998,34(12):2383～2392.
[3]	YU J,TAN H M,QIAN L Sh et al.Theoretical study on thermal beam focusing in longitudinally-pumped solid-state laser rods[J].High Power Laser Particle Beams,2000,12(1):27～31(in Chinese).
[4]	WANG D Sh,LI G,CHEN M et al.Measurement of thermal focallength of LD end-pumped crystal under stable-cavity-condition[J].Laser Technology,2003,27(6):534～537(in Chinese).
[5]	ZHAO H M,ZHAO Sh Zh,CHEN L.Thermal focal length and optimal pumping position of Nd:NaY(WO4)2 crystal[J].Infrared and Laser Engineering,2004,33(1):18～20 (in Chinese).
[6]	LÜ B D.Laser optics[M].3rd ed,Beijing:Higher Education Press,2003.75～83(in Chinese).
[7]	LÜ B D.Laser optics[M].3rd ed,Beijing:Higher Education Press,2003.343～345(in Chinese).
[8]	ZHENG J A,ZHAO Sh Zh,WANG Q P et al.Influence of thermal effect on the optimized design of LD end-pumped solid-state laser[J].Acta Photonica Sinica,2000,29(12):1121～1126(in Chinese).
[9]	RIMINGTON N W,SCHIEFFER S L,SCHROEDER W A.Thermallens shaping in brewster gain media:a high-power,diode-pumped Nd:GdVO4 laser[J].Optical Express,2004,12(7):1426～1436.
[10]	INNOCENZI M E,YURA H T,FINCHER C L et al.Thermal modeling of continuous-wave end-pumped solid-state laser[J].A P L,1990,56(19):1831～1833.

Determining the thermal lens focus of LD end-pumped Nd：GdVO4 solid-state laser with CCD detecting method

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