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报道了利用脉宽可调的光子晶体光纤飞秒激光放大器抽运矩形波导结构的GaP晶体太赫兹(THz)发射器产生频率可调谐的超快THz脉冲.非线性晶体中光整流过程产生的THz辐射频率随抽运光脉冲宽度而变化. GaP波导THz发射器可通过波导的几何尺寸来控制色散,以达到增加有效作用长度和提高输出功率的目的. 不同横截面尺寸的波导型发射器的THz辐射峰值频率随相位匹配条件的改变而改变,加以脉宽调节技术, 可以在大频谱范围获得频谱精细可调的THz脉冲.实验中在1 mm0.7 mm的波导型THz发射器中获得了频率可调谐的THz脉冲.提出实现THz辐射频率大范围调谐的GaP波导型阵列发射器的实施方案.
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关键词:
- 超快太赫兹波 /
- 频率调谐 /
- GaP波导 /
- 光子晶体光纤飞秒激光
We report on a frequency-tunable terahertz pulse train generated from a rectangular GaP waveguide emitter pumped by a pulse width tunable femtosecond photonic crystal fiber amplifier. The THz frequency can be tuned by varying the pump pulse duration. The dispersion of the emitter can be controlled via the geometry of the waveguide, and the coherent buildup length can be increased to scale up the output power. Waveguides with different cross sections can be used to tune the THz spectrum. Combined with the pump pulse duration tuning technique, THz pulses with a precisely tunable frequency can be obtained. In the experiment, tunable THz radiation is obtained from a GaP waveguide emitter with a cross section of 1 mm0.7 mm. Finally, a GaP emitter array is designed to achieve a wider tuning range.-
Keywords:
- ultrafast terahertz wave /
- frequency tuning /
- GaP waveguide /
- femtosecond photonic crystal fiber laser
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[13] Yang Y P, Feng S, Feng H, Pan X C, Wang Y Q, Wang W Z 2011Acta Phys. Sin. 60 027802 (in Chinese) [杨玉平,冯帅,冯辉,潘学聪,王义全,王文忠 2011 60 027802]
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[18] Vodopyanov K L 2006 Opt. Express 14 2263
[19] Liu F, Song Y J, Xing Q R, Hu M L, Li Y F, Wang C L, ChaiL, Zhang W L, Zheltikov A M, Wang C Y 2010 IEEE Photon.Technol. Lett. 22 814
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[22] Chang G Q, Divin C J, Yang J, Musheinish M A, Williamson S L,Galvanauskas A, Norris T B 2007 Opt. Express 15 16308
[23] Liu B W, Hu M L, Fang X H, Wu Y Z, Song Y J, Chai L, Wang CY, Zheltikov A M 2009 Laser Phys. Lett. 6 44034210-5
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[1] Tonouchi M 2007 Nature Photon. 1 97
[2] Hebling J, Yeh K L, Hoffmann M C, Nelson K A 2008 IEEE J.Sel. Top. Quantum Electron. 14 345
[3] Lu J Y, Chen L J, Kao T F, Chang H H, Chen H W, Liu A S, ChenY C, Wu R B, Liu W S, Chyi J I, Sun C K 2006 IEEE Photon.Technol. Lett. 18 2254
[4] He Y T, Jiang Y S, Zhang Y D, Fan G L 2010 Chin. Opt. Lett. 8162
[5] Lang L Y, Xing Q R, Li S X, Mao F L, Chai L, Wang Q Y 2004Chin. Opt. Lett. 2 677
[6] Ralph S E, Perkowitz S, Katzenellenbogen N, Grischkowsky D1994 J. Opt. Soc. Am. B 11 2528
[7] Wang C L, Tian Z, Xing Q R, Gu J Q, Liu F, Hu M L, Chai L,Wang Q Y 2010 Acta Phys. Sin. 59 7857 (in Chinese) [王昌雷,田震,邢岐荣,谷建强,刘丰,胡明列,柴路,王清月 2010 59 7857]
[8] Dorney T D, Baraniuk R G, Mittleman D M 2001 J. Opt. Soc. Am.A 18 1562
[9] Hou B H, Jian Y Z,Wang Y L, Zhang E P, Fu P Z,Wang L, ZhongR B 2010 Acta Phys. Sin. 59 4640 (in Chinese) [侯碧辉,菅彦珍,王雅丽,张尔攀,傅佩珍,汪力,钟任斌 2010 59 4640]
[10] Wang C, Gong J, Xing Q, Li Y, Liu F, Zhao X, Chai L, Wang C,Zheltikov A M 2010 J. Biophot. 3 641
[11] Ma X J, Zhao H W, Dai B, Liu G F 2008 Acta Phys. Sin. 57 3429 (in Chinese) [马晓菁,赵红卫,代斌,刘桂锋 2008 57 3429]
[12] Chen H, Wang L 2009 Chin. Phys. B 18 2785
[13] Yang Y P, Feng S, Feng H, Pan X C, Wang Y Q, Wang W Z 2011Acta Phys. Sin. 60 027802 (in Chinese) [杨玉平,冯帅,冯辉,潘学聪,王义全,王文忠 2011 60 027802]
[14] Hebling J, Stepanov A G, Almäsi G, Bartal B, Kuhl J 2004 Appl.Phys. B 78 593
[15] Ahn J, Efimov A V, Averitt R D, Taylor A J 2003 Opt. Express 112486
[16] Stepanov A G, Hebling J, Kuhl J 2004 Opt. Express 12 4650
[17] Bass M, Franken P A, Ward J F, Weinreich G 1962 Phys. Rev.Lett. 9 446
[18] Vodopyanov K L 2006 Opt. Express 14 2263
[19] Liu F, Song Y J, Xing Q R, Hu M L, Li Y F, Wang C L, ChaiL, Zhang W L, Zheltikov A M, Wang C Y 2010 IEEE Photon.Technol. Lett. 22 814
[20] Zhang K Q, Li D J 2007 Electromagnetic Theory for Microwavesand Optoelectronics (Berlin: Springer Verlag) pp346–349
[21] Xu J Z, Zhang X C 2007 Opt. Lett. 27 1067
[22] Chang G Q, Divin C J, Yang J, Musheinish M A, Williamson S L,Galvanauskas A, Norris T B 2007 Opt. Express 15 16308
[23] Liu B W, Hu M L, Fang X H, Wu Y Z, Song Y J, Chai L, Wang CY, Zheltikov A M 2009 Laser Phys. Lett. 6 44034210-5
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