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High-power and high-repetition-rate multi-wavelength femtosecond pulses are obtained by the nonlinear frequency up-conversion of large mode area photonic crystal fiber femtosecond system. Effects of focal length on the transverse mode of second harmonic are theoretically analyzed and experimentally demonstrated, showing that the longer the focal length, the better the mode quality. Under the condition of fundamental average power of 218 W, pulse duration of 110 fs and repetition rate of 50 MHz, generation of the second, third and fourth harmonics are achieved at the wavelengths of 520, 347, and 261 nm, with the maximum average power of 105, 47, and 214 W, respectively. The conversion efficiencies of frequency doubling and frequency tripling are 482% and 216%, and the conversion efficiency of frequency quadrupling from the second harmonic is 204%. Pulse duration of the fourth harmonic pulse is 408 fs, as measured by the cross-correlation technique.
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Keywords:
- ultra-fast optics /
- ultraviolet femtosecond laser /
- frequency up-conversion /
- photonic crystal fiber laser
[1] ［1］Baum P, Lochbrunner S, Riedle E 2004 Opt. Lett. 29 1686
[2] ［2］Zhu J F, Ling W J, Wang Z H, Wang P, Sun J H, Wei Z Y, Zhang D C, Ma X W, Zhan W L 2007 Appl. Opt. 46 6228
[3] ［3］Zhou Y, Wang G L, Li C M, Peng Q J, Cui D F, Xu Z Y, Wang X Y, Zhu Y, Chen C T, Liu G D, Dong X L, Zhou X J 2008 Chin. Phys. Lett. 25 963
[4] ［4］He J L, Lu X Q, Jia Y L, Man B Y 2000 Acta Phy. Sin. 49 2106 (in Chinese) ［何京良、卢兴强、贾玉磊、满宝元 2000 49 2106］
[5] ［5］Wang G L, Geng A C, Bo Y, Li H Q, Sun Z P, Bi Y, Cui D F, Xu Z Y, Yuan X, Wang X Q, Shen G Q, Shen D Z 2006 Opt. Commun. 259 820
[6] ［6］Zhang H, Wang G, Guo L, Geng A, Bo Y, Cui D, Xu Z, Li R, Zhu Y, Wang X, Chen C 2008 Appl. Phys. B 93 323
[7] ［7］Chen C T, Kanai T, Wang X Y, Zhu Y, Watanabe S 2008 Opt. Lett. 33 282
[8] ［8］Zhao S H, Chen G F, Zhao W, Wang Y S, Yu L J 2001 Chin. Phys. Lett. 18 537
[9] ［9］Ringling J, Kittelmann O, Noack F 1993 Opt. Lett. 18 2035
[10] ］Rotermund F, Petrow V 1998 Opt. Lett. 23 1040
[11] ］Liu Y Q, Zhang J, Liang W X, Wang Z H 2005 Acta Phys. Sin. 54 1593 (in Chinese) ［刘运全、张杰、梁文锡、王兆华 2005 54 1593］
[12] ］Song Y J, Hu M L, Liu B W, Chai L, Wang Q Y 2008 Acta Phys. Sin. 57 6425 (in Chinese) ［宋有建、胡明列、刘博文、柴路、王清月 2008 57 6425］
[13] ］Liu B W, Hu M L, Song Y J, Chai L, Wang Q Y 2008 Acta Phys. Sin. 57 6921 ( in Chinese) ［刘博文、胡明列、宋有建、柴路、王清月 2008 57 6921］
[14] ］Lan X J 2005 Laser Technology (2nd ed) (Beijing: Science Press) p287 (in Chinese) ［蓝信钜 2005 激光技术（第二版）(北京：科学出版社) 第287页］
[15] ］Fürbach A, Le T, Spielmann C, Krausz F 2000 Appl. Phys. B 70 S37
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[1] ［1］Baum P, Lochbrunner S, Riedle E 2004 Opt. Lett. 29 1686
[2] ［2］Zhu J F, Ling W J, Wang Z H, Wang P, Sun J H, Wei Z Y, Zhang D C, Ma X W, Zhan W L 2007 Appl. Opt. 46 6228
[3] ［3］Zhou Y, Wang G L, Li C M, Peng Q J, Cui D F, Xu Z Y, Wang X Y, Zhu Y, Chen C T, Liu G D, Dong X L, Zhou X J 2008 Chin. Phys. Lett. 25 963
[4] ［4］He J L, Lu X Q, Jia Y L, Man B Y 2000 Acta Phy. Sin. 49 2106 (in Chinese) ［何京良、卢兴强、贾玉磊、满宝元 2000 49 2106］
[5] ［5］Wang G L, Geng A C, Bo Y, Li H Q, Sun Z P, Bi Y, Cui D F, Xu Z Y, Yuan X, Wang X Q, Shen G Q, Shen D Z 2006 Opt. Commun. 259 820
[6] ［6］Zhang H, Wang G, Guo L, Geng A, Bo Y, Cui D, Xu Z, Li R, Zhu Y, Wang X, Chen C 2008 Appl. Phys. B 93 323
[7] ［7］Chen C T, Kanai T, Wang X Y, Zhu Y, Watanabe S 2008 Opt. Lett. 33 282
[8] ［8］Zhao S H, Chen G F, Zhao W, Wang Y S, Yu L J 2001 Chin. Phys. Lett. 18 537
[9] ［9］Ringling J, Kittelmann O, Noack F 1993 Opt. Lett. 18 2035
[10] ］Rotermund F, Petrow V 1998 Opt. Lett. 23 1040
[11] ］Liu Y Q, Zhang J, Liang W X, Wang Z H 2005 Acta Phys. Sin. 54 1593 (in Chinese) ［刘运全、张杰、梁文锡、王兆华 2005 54 1593］
[12] ］Song Y J, Hu M L, Liu B W, Chai L, Wang Q Y 2008 Acta Phys. Sin. 57 6425 (in Chinese) ［宋有建、胡明列、刘博文、柴路、王清月 2008 57 6425］
[13] ］Liu B W, Hu M L, Song Y J, Chai L, Wang Q Y 2008 Acta Phys. Sin. 57 6921 ( in Chinese) ［刘博文、胡明列、宋有建、柴路、王清月 2008 57 6921］
[14] ］Lan X J 2005 Laser Technology (2nd ed) (Beijing: Science Press) p287 (in Chinese) ［蓝信钜 2005 激光技术（第二版）(北京：科学出版社) 第287页］
[15] ］Fürbach A, Le T, Spielmann C, Krausz F 2000 Appl. Phys. B 70 S37
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