具有中心对称结构的3m点群晶体中紫外三次谐波的产生
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摘要
研究了中心对称晶体中的三阶非线性频率转换,并在这类晶体中实现了紫外激光的有效输出.确定了负单轴晶体的相位匹配角公式及相应的相位匹配角.选择带有离域共轭π键的冰洲石晶体和α-BBO晶体进行实验.以飞秒激光作为基频光,在Ⅱ类相位匹配方式下,利用α-BBO晶体获得了最高单脉冲能量为37.6μJ的266nm紫外三次谐波,最高转换效率为2.5%;利用冰洲石晶体获得了最高单脉冲能量为19.3μJ的266nm紫外三次谐波,最高转换效率为1.25%.该研究验证了利用中心对称晶体的三阶非线性效应直接获得紫外激光的可行性和获得深紫外激光的可能性,为紫外非线性晶体的探索和深紫外激光的研究提供参考.
A simple one-step direct third-order nonlinear frequency conversion process in centrosymmetric crystals was studied,and an efficient third-harmonic generation in UV region was obtained.The expressions of phase-matching angles were determined.α-BBO crystal and the calcite crystal which both have the delocalizedπbond were selected in our experiment.In type-Ⅱ phase-matched,the maximal output energy was 19.3μJ and the maximal conversion efficiency was about 1.25% at 266 nm in calcite crystal,while the value was 37.6μJ and 2.5%inα-BBO crystal.These results indicate the feasibility of direct third-harmonic generation in UV region,the possibility of direct third-harmonic generation in deepUV region through centrosymmetric crystals,and also demonstrated a succinct and efficient way to generate deep-UV laser and a development direction of nonlinear crystals in UV region.
A simple one-step direct third-order nonlinear frequency conversion process in centrosymmetric crystals was studied,and an efficient third-harmonic generation in UV region was obtained.The expressions of phase-matching angles were determined.α-BBO crystal and the calcite crystal which both have the delocalizedπbond were selected in our experiment.In type-Ⅱ phase-matched,the maximal output energy was 19.3μJ and the maximal conversion efficiency was about 1.25% at 266 nm in calcite crystal,while the value was 37.6μJ and 2.5%inα-BBO crystal.These results indicate the feasibility of direct third-harmonic generation in UV region,the possibility of direct third-harmonic generation in deepUV region through centrosymmetric crystals,and also demonstrated a succinct and efficient way to generate deep-UV laser and a development direction of nonlinear crystals in UV region.
引文
[1]SUDMEYER T,IMAI Y,MASUDA H,et al.12Wcontinuous-wave 266-nm deep-UV generation through 24Wsinglefrequency 1064-nm light from a fiber MOPA[C].Conference on lasers&Electro-optics,2007,1-2.
[2]WANG Li-rong,ZHAI Nai-xia,LIU Li-juan,et al.High-average-power 266nm generation with a KBe2BO3F2prismcoupled device[J].Optics Express,2014,22(22):27086-27093.
[3]XIE Xiao-bing,WEI Dai-kang,MA Xiu-hua,et al.High efficiency single frequency 355nm all-solid-state UV laser[J].Laser Physics,2016,26(5):055403.
[4]CHEN H,LIU Q,YAN P,et al.High-power 355nm ultraviolet lasers operating at ultrahigh repetition rate[J].Laser Physics Letters,2013,10(2):025401.
[5]KUMAR S,CASALS J,WEI Jun-xiong,et al.High-power,high-repetition-rate performance characteristics ofβ-BaB2O4for single-pass picosecond ultraviolet generation at 266nm[J].Optics Express,2015,23(21):28091-28103.
[6]PHILLIPS J,BANERJEE S,SMITH J,et al.High energy,high repetition rate,second harmonic generation in large DKDP,YCOB,and LBO crystals[J].Optics Express,2016,24(17):19682-19694.
[7]KEI T,MASASHI Y,YOSHINORI T,et al.Ultraviolet laser-induced degradation of CsLiB6O10 andβ-BaB2O4[J].Optics Materials Express,2014,4(3):559-567.
[8]KITANO H,MATSUI T,SATO K,et al.Efficient 355-nm generation in CsB3O5crystal[J].Optics Letters,28(4):263-265.
[9]CHEN C,WANG G,WANG X,XU Z.Deep-UV nonlinear optical crystal KBe2BO3F2---discovery growth,optical properties and applications[J].Applied Physics B,2009,97(1):9-25.
[10]PENZKOFER A,OSSIG F,QIU P.Picosecond third-harmonic light generation in calcite[J].Applied Physics B,1988,47(1):71-81.
[11]GRAVIER F,BOULANGER B.Phase-matched third-order frequency generation in TiO2 rutile single crystal[C].Conference on Lasers&Electro-optics,2006,1-2.
[12]LIU Xi,LI Peng-cheng,ZHU Xiao-song,et al.Probing theπ-π*transitions in conjugated compounds with an infrared femtosecond laser[J].Physical Review A,2017,95(3):033412.
[13]BOYD R W.Nonlinear optics[M].Academic Press,New York,2008:32.
[14]KERASIDOU A,ILIOPOULOS K,AYADI A,et al.Third order nonlinear optical response of conjugated photoactive ligands[J].International Conference on Transparent Optical Networks,2015.
[15]石顺祥,陈国夫,赵卫,刘继芳.非线性光学[M].西安:西安电子科技大学出版社,2005.
[16]陈纲,廖理几,郝伟.晶体物理学基础[M].北京:科学出版社,2007.
[17]BANKS P,FEIT M,PERRY M.High-intensity third-harmonic generation[J].Journal of the Optical Society of America B,2002,19(1):102-118.
[18]YANG Xue-lin,XIE Sheng-wu.Expression of third-order effective nonlinear susceptibility for third-harmonic generation in crystals[J].Applied Optics,1995,34(27):6130-6135.
[2]WANG Li-rong,ZHAI Nai-xia,LIU Li-juan,et al.High-average-power 266nm generation with a KBe2BO3F2prismcoupled device[J].Optics Express,2014,22(22):27086-27093.
[3]XIE Xiao-bing,WEI Dai-kang,MA Xiu-hua,et al.High efficiency single frequency 355nm all-solid-state UV laser[J].Laser Physics,2016,26(5):055403.
[4]CHEN H,LIU Q,YAN P,et al.High-power 355nm ultraviolet lasers operating at ultrahigh repetition rate[J].Laser Physics Letters,2013,10(2):025401.
[5]KUMAR S,CASALS J,WEI Jun-xiong,et al.High-power,high-repetition-rate performance characteristics ofβ-BaB2O4for single-pass picosecond ultraviolet generation at 266nm[J].Optics Express,2015,23(21):28091-28103.
[6]PHILLIPS J,BANERJEE S,SMITH J,et al.High energy,high repetition rate,second harmonic generation in large DKDP,YCOB,and LBO crystals[J].Optics Express,2016,24(17):19682-19694.
[7]KEI T,MASASHI Y,YOSHINORI T,et al.Ultraviolet laser-induced degradation of CsLiB6O10 andβ-BaB2O4[J].Optics Materials Express,2014,4(3):559-567.
[8]KITANO H,MATSUI T,SATO K,et al.Efficient 355-nm generation in CsB3O5crystal[J].Optics Letters,28(4):263-265.
[9]CHEN C,WANG G,WANG X,XU Z.Deep-UV nonlinear optical crystal KBe2BO3F2---discovery growth,optical properties and applications[J].Applied Physics B,2009,97(1):9-25.
[10]PENZKOFER A,OSSIG F,QIU P.Picosecond third-harmonic light generation in calcite[J].Applied Physics B,1988,47(1):71-81.
[11]GRAVIER F,BOULANGER B.Phase-matched third-order frequency generation in TiO2 rutile single crystal[C].Conference on Lasers&Electro-optics,2006,1-2.
[12]LIU Xi,LI Peng-cheng,ZHU Xiao-song,et al.Probing theπ-π*transitions in conjugated compounds with an infrared femtosecond laser[J].Physical Review A,2017,95(3):033412.
[13]BOYD R W.Nonlinear optics[M].Academic Press,New York,2008:32.
[14]KERASIDOU A,ILIOPOULOS K,AYADI A,et al.Third order nonlinear optical response of conjugated photoactive ligands[J].International Conference on Transparent Optical Networks,2015.
[15]石顺祥,陈国夫,赵卫,刘继芳.非线性光学[M].西安:西安电子科技大学出版社,2005.
[16]陈纲,廖理几,郝伟.晶体物理学基础[M].北京:科学出版社,2007.
[17]BANKS P,FEIT M,PERRY M.High-intensity third-harmonic generation[J].Journal of the Optical Society of America B,2002,19(1):102-118.
[18]YANG Xue-lin,XIE Sheng-wu.Expression of third-order effective nonlinear susceptibility for third-harmonic generation in crystals[J].Applied Optics,1995,34(27):6130-6135.