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The 266 nm continuous-wave coherent radiation is generated by the second harmonic generation of a β-BBO crystal placed inside an external enhancement cavity. Its fundamental beam is a 532 nm laser from commercial production of Coherent Company. Impact of focusing shape of the crystal on the conversion efficiency is simulated detailedly. Theoretical and experimental results show that the elliptical focusing can decrease the walk-off effect and improve conversion efficiency of the second harmonic generation (SHG). We obtain experimentally the 266 nm radiation output of 180 mW with elliptical focusing in a BBO crystal using bowtie cavity when the fundamental wave input 1 W . The SHG conversion efficiency reaches 18%.
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Keywords:
- ultraviolet continuous-wave laser /
- second harmonic generation /
- β-BBO crystal /
- elliptical Gaussian beam
[1] Jones-Bey H 1998 Laser Focus World 34 127
[2] Knittel J, Kung A H 1997 Optics Letters 22 366
[3] Tidwell S C, Seamans J F, Lowenthal D D 1993 Optics Letter 18 15
[4] Liu Q, Yan X P, Fu X, Gong M, Wang D S 2009 Laser Physics Letters 6 3
[5] Xiang Z, Ge J H, Zhao Z G, Wang S, Liu C, Chen J 2009 Chinese Optics Letters 7 502
[6] He J L, Lu X Q, Jia Y L, Ma n B Y, Zhu S N, Zhu Y Y 2000 Acta Phys. Sin. 49 2106 (in Chinese) [何京良, 卢兴强, 贾玉磊, 满宝元, 祝世宁, 朱永元 2000 49 2106]
[7] Geng A C, Zhang H B, Wang G L, Bo Y, Xu Z Y, Wang X Q, Shen D Z 2007 Journal of Optoelectronics·Laser 18 767
[8] Chen G F, Du G G, Wang X H 1999 Acta Photonica Sinica 28 8
[9] Tan C Q, Zheng Q, Xue Q H 2005 Laser & Infrared 35 490
[10] Wang L R, Wang G L, Zhang X, Liu L J, Wang X Y, Zhu Y, Chen C T 2012 Chinese Physics Letters 29 064203
[11] Peng Y, Fang Z J, Zang E J 2011 Chinese Physics Letters 28 104207
[12] Oka M, Liu L Y, Wiechmann W 1995 IEEE Journal of Selected Topics in Quantum Electronics. 1 859
[13] Xu S, Cai H, Zeng H 2007 Optics Express 15 10576
[14] Yuan X, Shen D Z, Wang X Q, Shen G Q 2005 Journal of Synthetic Crystals 34 102
[15] Steinbach A, Rauner M, Cruz F C, Bergquist J C 1996 Optics Communications 123 207
[16] Ostroumov V, Gmbh W S C, Luebeck B 2007 Proc. of SPIE 6451 1
[17] Herskind P, Lindballe J, Clausen C 2007 Optics Letters 32 268
[18] Boyd G D, Kleinman D A 1968 J. Appl. Phys 39 35
[19] Chen Y F, Chen Y C 2003 Appl. Phys. B 76 645
[20] Hänsch T W, Couillaud B 1980 Opt. Commun. 35 441
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[1] Jones-Bey H 1998 Laser Focus World 34 127
[2] Knittel J, Kung A H 1997 Optics Letters 22 366
[3] Tidwell S C, Seamans J F, Lowenthal D D 1993 Optics Letter 18 15
[4] Liu Q, Yan X P, Fu X, Gong M, Wang D S 2009 Laser Physics Letters 6 3
[5] Xiang Z, Ge J H, Zhao Z G, Wang S, Liu C, Chen J 2009 Chinese Optics Letters 7 502
[6] He J L, Lu X Q, Jia Y L, Ma n B Y, Zhu S N, Zhu Y Y 2000 Acta Phys. Sin. 49 2106 (in Chinese) [何京良, 卢兴强, 贾玉磊, 满宝元, 祝世宁, 朱永元 2000 49 2106]
[7] Geng A C, Zhang H B, Wang G L, Bo Y, Xu Z Y, Wang X Q, Shen D Z 2007 Journal of Optoelectronics·Laser 18 767
[8] Chen G F, Du G G, Wang X H 1999 Acta Photonica Sinica 28 8
[9] Tan C Q, Zheng Q, Xue Q H 2005 Laser & Infrared 35 490
[10] Wang L R, Wang G L, Zhang X, Liu L J, Wang X Y, Zhu Y, Chen C T 2012 Chinese Physics Letters 29 064203
[11] Peng Y, Fang Z J, Zang E J 2011 Chinese Physics Letters 28 104207
[12] Oka M, Liu L Y, Wiechmann W 1995 IEEE Journal of Selected Topics in Quantum Electronics. 1 859
[13] Xu S, Cai H, Zeng H 2007 Optics Express 15 10576
[14] Yuan X, Shen D Z, Wang X Q, Shen G Q 2005 Journal of Synthetic Crystals 34 102
[15] Steinbach A, Rauner M, Cruz F C, Bergquist J C 1996 Optics Communications 123 207
[16] Ostroumov V, Gmbh W S C, Luebeck B 2007 Proc. of SPIE 6451 1
[17] Herskind P, Lindballe J, Clausen C 2007 Optics Letters 32 268
[18] Boyd G D, Kleinman D A 1968 J. Appl. Phys 39 35
[19] Chen Y F, Chen Y C 2003 Appl. Phys. B 76 645
[20] Hänsch T W, Couillaud B 1980 Opt. Commun. 35 441
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