[1] Enloe L H, Rodda J L. Laser phase-locked loop [J]. Proc of IEEE, 1965, 53: 165-166.
[2] Stover H L, Steier W H. Locking of laser oscillators by light injection [J]. Appl Phys Lett, 1966, 8(4): 91-93.
[3] Yu C X, Fan T Y. Beam Combining [M]. New York: McGraw-Hill, 2011: 533-571.
[4] Liu Zejin, Zhou Pu, Xu Xiaojun, et al. Coherent beam combining of high power fiber lasers: Progress and prospect [J]. Scientia Sinica Technologica, 2013, 43(9): 979-990. (in Chinese)
[5] Kong H J, Park S, Cha S, et al. Conceptual design of the Kumgang laser: a high-power coherent beam combination laser using SC-SBS-PCMs towards a Dream laser [J]. High Power Laser Science and Engineering, 2015, 3: e1.
[6] Brocklesby W S, Nilsson J, Schreiber T, et al. ICAN as a new laser paradigm for high energy, high average power femtosecond pulses [J]. Eur Phys J, 2014, 223: 1189-1195.
[7] Ma P, Zhou P, Ma Y, et al. Coherent polarization beam combining of four high-power fiber amplifiers using single-frequency dithering technique [J]. IEEE Photon Technol Lett, 2012, 24(12): 1024-1026.
[8] Pawlak R J. Recent developments and near term directions for Navy laser weapons system (LaWS) testbed[C]//SPIE, 2012, 8547: 854705.
[9] Mohring B, Dietrich S, Tassini L, et al. High-energy laser activities at MBDA Germany[C]//SPIE, 2013, 8733: 873304.
[10] Ludewigt K, Riesbeck T, Graf A, et al. 50 kW laser weapon demonstrator of Rheinmetall Waffe Munition[C]//SPIE, 2013, 8898: 88980N.
[11] Lei C, Gu Y, Chen Z, et al. Incoherent beam combining of fiber lasers by an all-fiber 7×1 signal combiner at a power level of 14 kW [J]. Opt Express, 2018, 26(8): 10421-10427.
[12] Sanchez-Rubio A, Fan T Y, Augst S J, et al. Wavelength beam combining for power and brightness scaling of laser systems [J]. Lincoln Laboratory Journal, 2014, 20(2): 52-66.
[13] Augst S J, Redmond S M, Yu C X, et al. Sanchez. Coherent and spectral beam combining of fiber lasers[C]//SPIE, 2012, 8237: 823704.
[14] Huang R K, Chann B, Missaggia L J, et al. Sanchez-Rubio. High-brightness wavelength beam combined semiconductor laser diode arrays [J]. IEEE Photonics Technology Letters, 2007, 19(4): 209-211.
[15] Chann B, Goyal A K, Fan T Y, et al. Efficient, high-brightness wavelength-beam-combined commercial off-the-shelf diode stacks achieved by use of a wavelength-chirped volume Bragg grating [J]. Opt Lett, 2006, 31(9): 1253-1255.
[16] Loftus T H, Thomas A M, Hoffman P R, et al. Spectral beam-combining fiber lasers for high-average-power applications [J]. IEEE J Sel Top Quantum Electron, 2007, 13(3): 487-497.
[17] Loftus T H, Liu A, Hoffman P R, et al. 258 W of spectrally beam combined power with near-diffraction limited beam quality[C]//SPIE, 2006, 6102: 61020S.
[18] Loftus T H, Liu A, Hoffman P R, et al. 522 W average power, spectrally beam-combined fiber laser with near-diffraction-limited beam quality [J]. Opt Lett, 2007, 32(4): 349-351.
[19] Afzal R S, Honea E, Savage-Leuchs M, et al. Spectrally beam combined fiber lasers for high power, efficiency and brightness [C]//SPIE, 2012, 8547: 854706.
[20] Honea E, Afzal R S, Savage-Leuchs M, et al. Advances in fiber laser spectral beam combining for power scaling[C]//SPIE, 2016, 9730: 97300Y.
[21] Reich M, Limpert J, Liem A, et al. Spectral beam combining of ytterbium-doped fiber lasers with a total output power of 100 W[C]//Europhys Conf Abstracts, 2004: 28C Fib-10137.
[22] Klingebiel S, Röser F, Ortac B, et al. Spectral beam combining of Yb-doped fiber lasers with high efficiency [J]. J Opt Soc Am B, 2007, 24(8): 1716-1720.
[23] Schreiber T, Wirth C, Schmidt O, et al. Incoherent beam combining of coutinuous-wave and pulsed Yb-doped fiber amplifiers [J]. IEEE J Sel Top Quantum Electron, 2009, 15(2): 354-360.
[24] Wirth C, Schmidt O, Tsybin I, et al. High average power spectral beam combining of four fiber amplifiers to 8.2 kW [J]. Opt Lett, 2011, 36(16): 3118-3120.
[25] Decker J, Crump P, Fricke J, et al. 25-W monolithic spectrally stabilized 975 nm minibars for dense spectral beam combining [J]. IEEE Photonics Tech Lett, 2015, 27: 1675-1678.
[26] Witte U, Traub M, Meo A D, et al. Compact 35 µm fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini-bars[C]//SPIE, 2017, 9733: 97330H.
[27] Sevian A, Andrusyak O, Ciapurin I, et al. Efficient power scaling of laser radiation by spectral beam combining [J]. Opt Lett, 2008, 33(4): 384-386.
[28] Drachenberg D, Divliansky I, Smirnov V, et al. High power spectral beam combining of fiber lasers with ultra high spectral density by thermal tuning of volume Bragg gratings [C]//SPIE, 2011, 7914: 79141F.
[29] Ott D, Divliansky I, Anderson B, et al. Scaling the spectral beam combining channels in a multiplexed volume Bragg grating [J]. Opt Express, 2013, 21(24): 29620-29627.
[30] Regelskis K, Hou K C, Raciukaitis G, et al. Spatial-dispersion-free spectral beam combining of high power pulsed Yb-doped fiber lasers[C]//Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference and Photonic Applications Systems Technologies, OSA Technical Digest, 2008: CMA4.
[31] Ma Yi, Yan Hong, Peng Wanjing, et al. 9.6 kW common aperture spectral beam combination system based on multi-channel narrow-linewidth fiber lasers [J]. Chinese Journal of Lasers, 2016, 43(9): 0901009. (in Chinese)
[32] Meng H, Sun T, Tan H, et al. High-brightness spectral beam combining of diode laser array stack in an external cavity [J]. Opt Express, 2015, 23(17): 21819-21824.
[33] Zheng Y, Yang Y, Wang J, et al. 10.8 kW spectral beam combination of eight all-fiber superfluorescent sources and their dispersion compensation [J]. Opt Express, 2016, 24(11): 12064-12071.
[34] Zhang J, Peng H, Fu X, et al. CW 50W/M2 = 10.9 diode laser source by spectral beam combining based on a transmission grating [J]. Opt Express, 2013, 21(3): 3627-3632.
[35] Jiang Man, Ma Pengfei, Zhou Pu, et al. Beam quality in spectral beam combination based on multi-layer dielectric grating [J]. Acta Physica Sinica, 2016, 65(10): 104203. (in Chinese)
[36] Chen F, Ma J, Wei C, et al. 10 kW-level spectral beam combination of two high power broad-linewidth fiber lasers by means of edge filters [J]. Opt Express, 2017, 25(26): 32783-32791.
[37] Zheng Ye, Yang Yifeng, Zhao Xiang, et al. Research Progress on Spectral Beam Combining Technology of High-Power Fiber Lasers [J]. Chinese Journal of Lasers, 2017, 44(2): 0201018. (in Chinese)
[38] Zhang Jun, Chen Yongyi, Qin Li, et al. Advances in high power high beam quality diode lasers [J]. Chinese Science Bulletin, 2017, 62(32): 3719-3728. (in Chinese)
[39] Nosu K, Ishio H, Hashimoto K. Multireflection optical multi/demultiplexer using interference filters [J]. Electron Lett, 1979, 15(14): 414-415.
[40] Minott P O, Abshire J B. Grating rhomb diode laser power combiner[C]//SPIE, 1987, 756: 38-49.
[41] Rall J A R, Spadin P L, Zimmerman R K, et al. Test results of a diffraction grating beam combiner[C]//Free-Space Laser Commun Technol, 1990, 1218: 264-275.
[42] White I H. A multichannel grating cavity laser for wavelength division multiplexing applications [J]. J Lightwave Technol, 1991, 9(7): 893-899.
[43] Farries M C, Carter A C, Jones G G, et al. Tunable multiwavelength semiconductor laser with single fibre output [J]. Electron Lett, 1991, 27(17): 1498-1499.
[44] Chann B, Huang R K, Missaggia L J, et al. High-power, near-diffraction-limited diode laser arrays by wavelength beam combining [J]. Opt Lett, 2005, 30(16): 2104-2106.
[45] Cook C C, Fan T Y. Spectral beam combining of Yb-doped fiber lasers in an external cavity[C]//OSA, 1999, 26: 163–166.
[46] Daneu V, Sanchez A, Fan T Y, et al. Spectral beam combining of a broad-stripe diode laser array in an external cavity [J]. Opt Lett, 2000, 25(6): 405-407.
[47] Bochove E J. Theory of spectral beam combining of fiber lasers [J]. IEEE J Quantum Electron, 2002, 38(5): 432-445.
[48] Augst S J, Goyal A K, Aggarwal R L, et al. Wavelength beam combining of ytterbium fiber lasers [J]. Opt Lett, 2003, 28(5): 331-333.
[49] Fan T Y. Laser beam combining for high-power, high-radiance sources [J]. IEEE J Sel Top Quantum Electron, 2005, 11(3): 567-577.
[50] Drachenberg D R, Andrusyak O, Venus G, et al. Thermal tuning of volume Bragg gratings for spectral beam combining of high-power fiber lasers [J]. Appl Opt, 2014, 53(6): 1242-1246.
[51] Wirth C, Schmidt O, Tsybin I, et al. 2 kW incoherent beam combining of four narrow-linewidth photonic crystal fiber amplifiers [J]. Opt Express, 2009, 17(3): 1178-1183.
[52] Newswire P R. Lockheed Martin Demonstrates Weapons Grade High Power Fiber Laser [EB/OL]. [2014-01-28]. https://news.lockheedmartin..
[53] Zhang Yan, Zhang Bin, Zhu Songjun. Analysis of the property of the beam after spectral beam combining [J]. Acta Physica Sinica, 2007, 56(8): 4590-4595. (in Chinese)
[54] Yin Suqin, Zhang Bin. Analysis of the output characteristics of high-power fiber lasers after spectral beam combination [J]. Acta Optica Sinica, 2011, 31(2): 0214002. (in Chinese)
[55] Yu Yi, Wang Weimin, Lu Yan, et al. Simulation of spectrally beam combined diode laser based on grating-cavity [J]. High Power Laser and Particle Beams, 2008, 20(2): 189-192. (in Chinese)
[56] Liu Bo, Zhang Xue. Han Junting, et al. Wavelength beam combining of laser diode array by wavelength-chirped volume Bragg grating external cavity [J]. High Power Laser and Particle Beams, 2008, 20(7): 1057-1062. (in Chinese)
[57] Pu Shibing, Jiang Zongfu, Xu Xiaojun. Numerical analysis of spectral beam combining by volume Bragg grating [J]. High Power Laser and Particle Beams, 2008, 20: 721-724. (in Chinese)
[58] Shen Benjian, Zheng Guangwei, Tan Jichun, et al. Spectral beam combining by phase-shifted reflective volume Bragg gratings [J]. Chinese Journal of Lasers, 2010, 12: 3056-3059. (in Chinese)
[59] Zhan Shengbao, Zhao Shanghong, Ni Shouchun, et al. Design of spectral beam combining based on reflecting volume Bragg grating [J]. High Power Laser and Particle Beams, 2011, 4: 929-933. (in Chinese)
[60] 田飞, 颜宏, 陈黎, 等. 基于平行双光栅的三路光纤激光光谱合成实验研究[C]//中物院高能激光科学与技术重点实验室第三届学术交流会论文集, 2014: 37-41.
[61] 梁小宝, 周泰斗, 王小军, 等. 体布拉格光栅用于高功率宽谱组束的研究[C]//中物院高能激光科学与技术重点实验室第三届学术交流会论文集, 2014: 42-46.
[62]

Zhou Taidou, Liang Xiaobao, Li Chao, et al. 2.5 kW average power, two-channel spectral-beam-combined output based on transmitting volume Bragg grating [J]. Aca Physica Sinica, 2017, 66(8): 084204. (in Chinese)
[63] 颜宏. 基于双光栅的光纤激光光谱合成[D]. 绵阳: 中国工程物理研究院, 2019.
[64]

Wu Z, Zhong Z, Yang L, et al. Beam properties in a spectral beam combining system based on trapezoidal multilayer dielectric gratings [J]. J Opt Soc Am B, 2016, 33(2): 171-179.
[65]

Yang L, Wu Z, Zhang B. Influence of thermal deformation of a multilayer dielectric grating on a spectrally combined beam [J]. Appl Opt, 2016, 55(32): 9091-9100.
[66]

Chen J, Zhang Y, Wang Y, et al. Polarization-independent broadband beam combining grating with measured over 98% diffraction efficiency from 1023nm to 1080nm [J]. Opt Lett, 2017, 42(19): 4016-4019.
[67]

Tian J, Zhang J, Peng H, et al. High power diode laser source with a transmission grating for two spectral beam combining [J]. Optik, 2019, 192: 162918.
[68]

Sun F, Shu S, Zhao Y, et al. High-brightness diode lasers obtained via off-axis spectral beam combining with selective feedback [J]. Opt Express, 2018, 26(17): 21813-21818.
[69]

Sun Fangyuan. Investigation of high beam quality laser by external cavity combination technology[D]. Beijing: University of Chinese Acadeny of Sciences, 2018. (in Chinese)
[70]

Jiang Man. Study on the key technique of fiber laser spectral beam combining [D]. Changsha: National University of Defense Technology, 2017. (in Chinese)
[71]

Chen F, Ma J, Zhu R, et al. Coupling efficiency model for spectral beam combining of high-power fiber lasers calculated from spectrum [J]. Appl Opt, 2017, 56(10): 2574-2579.
[72]

Chen F, Zhang J, Ma J, et al. Beam quality analysis and optimization for 10 kW-level spectral beam combination system [J]. Opt Commun, 2019, 444: 45-55.
[73]

Liu Q, Jin Y, Wu J, et al. Fabrication of the polarization independent spectral beam combining grating [C]//SPIE, 2016, 10255: 1025514
[74]

Mao X, Li C, Qiu K, et al. Design and fabrication of 1300-line/mm polarization-independent reflection gratings for spectral beam combining [J]. Opt Commun, 2020, 458: 124883-4.
[75]

Wu Z, Xu Y, Huang Y. Influence of process errors of dielectric gratings on beam properties in transmission spectral-beam-combining systems [J]. Appl Opt, 2019, 58(16): 4300-4305.
[76]

Schmidt O, Wirth C, Nodop D, et al. Spectral beam combination of fiber amplified ns-pulses by means of interference filters [J]. Opt Express, 2009, 17(25): 22974-22982.
[77]

Jiao H, Niu X, Zhang X, et al. Design and fabrication of a superior nonpolarizing long-wavelength pass edge filter applied in laser beam combining technology [J]. Appl Opt, 2020, 59(5): A162-A166.
[78]

Efimov O M, Glebov L B, Smirnov V I. High efficiency volume diffractive elements in photo-thermo-refractive glass: US, 6673497 [P]. 2004-01-06.
[79]

Andrusyak O, Smirnov V, Venus G, et al. Spectral combining and coherent coupling of lasers by volume Bragg gratings [J]. IEEE J Select Top Quantum Electron, 2009, 15(2): 344-353.
[80]

Andrusyak O, Ciapurin I, Smirnov V, et al. Spectral beam combining of fiber lasers with increased channel density[C]//SPIE, 2007, 6453: 64531L.
[81]

Hamilton C E, Tidwell S C, Lowenthal D D. High-power laser source with spectrally beam-combined diode laser bars [C]//SPIE, 2004, 5336: 1-10.
[82]

Vijayakumar D, Jensen O B, Ostendorf R, et al. Spectral beam combining of a 980 nm tapered diode laser bar [J]. Opt Express, 2010, 18(2): 893-8.
[83]

Hecht J. Beam combining cranks up the power [J]. Laser Focus World, 2012, 48: 41-43.
[84]

Huang R K, Chann B, Burgess J, et al. Teradiode’s high brightness semiconductor lasers [C]//SPIE, 2016, 9730: 97300C.
[85]

Witte U, Schneider F, Traub M, et al. kW-class direct diode laser for sheet metal cutting based on DWDM of pump modules by use of ultra-steep dielectric filters [J]. Opt Express, 2016, 24(20): 22917-22929.
[86]

Huang R K, Chann B, Glenn J D. Ultra-high brightness wavelength-stabilized kW-class fiber coupled diode laser[C]//SPIE, 2011, 7918: 791810.
[87]

Wood M. Laser beam technology development and application [C]//7th Alta Brillanza Workshop, 2015: 24–25.
[88]

Zimer H, Haas M, Nagel S, et al. Spectrally stabilized and combined diode lasers[C]//IEEE Conf on High Power Diode Lasers and Systems, 2015: 31–32.
[89]

Heinemann S, Fritsche H, Kruschke B, et al. Compact high brightness diode laser emitting 500W from a 100 μm fiber[C]//SPIE, 2013, 8605: 86050Q.
[90]

Unger A, Uthoff R, Stoiber M, et al. Tailored bar concepts for 10 mm-mrad fiber coupled modules scalable to kW-class direct diode lasers[C]//SPIE, 2015, 9348: 934809.
[91]

Hengesbach S, Krauch N, Holly C, et al. High-power dense wavelength division multiplexing of multimode diode laser radiation based on volume Bragg gratings [J]. Opt Lett, 2013, 38(16): 3154-3157.
[92]

Fritsche H, Krusche B, Koch R, et al. High brightness, direct diode laser with kW output power [C]//SPIE, 2014, 8965: 89650G.
[93]

Ferrario F, Fritsche H, Grohe A, et al. Building block diode laser concept for high brightness laser output in the kW range and its applications [C]//SPIE, 2016, 9730: 97300G.
[94]

Witte U, Schneider F, Holly C, et al. kW-class direct diode laser for sheet metal cutting based on commercial pump modules [C]//SPIE, 2017, 10086: 1008608.
[95]

Zimer H, Haas M, Ried S, et al. Thin film filter wavelength-locked laser cavity for spectral beam combining of diode laser arrays [C]//Photonics Conference, 2014: 230-231.
[96]

Haas M, Rauch S, Nagel S, et al. Thin-film filter wavelength-stabilized, grating combined, high-brightness kW-class direct diode laser [J]. Opt Express, 2017, 25(15): 17657-17670.
[97]

Strohmaier S G, Erbert G, Meissner-Schenk A H, et al. kW-class diode laser bars[C]//SPIE, 2017, 10086: 100860C.
[98]

Zhang J, Peng H Y, Liu Y, et al. Hundred-watt diode laser source by spectral beam combining [J]. Laser Phys Lett, 2014, 11(12): 125803.
[99]

Zhu Z, Gou L, Jiang M H, et al. High beam quality in two directions and high efficiency output of a diode laser array by spectral-beam-combining [J]. Opt Express, 2014, 22(15): 17804-17809.
[100]

Meng Huicheng, Wu Deyong, Tan Hao, et al. Experimental study on high brightness and narrow band of diode laser by spectral beam combining of grating-external cavity [J]. Chinese Journal of Lasers, 2015, 42(3): 0302003. (in Chinese)
[101]

Meng H, Ruan X, Du W, et al. Scaling the spectral beam combining channel by multiple diode laser stacks in an external cavity [J]. Laser Phys Lett, 2017, 14(4): 045811.
[102]

Lin X, Lin G, Zhao P, et al. Generation of high brightness diode laser by using spectral and polarization beam combination [J]. Opt and Laser Tech, 2019, 116: 219-223.
[103]

Schmidt O, Andersen T V, Limpert J, et al. 187 W, 3.7 mJ from spectrally combined pulsed 2 ns fiber amplifiers [J]. Opt Lett, 2009, 34(3): 226-228.
[104]

Schmidt O, Wirth C, Tsybin I, et al. Average power of 1.1 kW from spectrally combined, fiber-amplifiered, nanosecond-pulsed sources [J]. Opt Lett, 2009, 34(10): 1567-1569.
[105]

Newswire P R. Turning up the heat: latest evolution of Lockheed Martin laser weapon system stops truck in field test [EB/OL]. [2015-03-03]. https://news.lockheedmartin.coming-Up-the-Heat-Latest-Evolution-of-Lockheed-Martin-Laser-Weapon-System-Stops-Truck-in-Field-Test.
[106]

Newswire P R. Lockheed Martin to deliver world record-setting 60 kW laser to U.S. Army [EB/OL]. [2017-03-16]. http://news.lockheedmartin.com.
[107]

Newswire P R. Team Dynetics Receives Contract For Next Phase Of 100 KW-Class Laser Weapon System For U.S. Army [EB/OL]. [2018-08-06]. https://news.lockheedmartin.com.
[108]

Liang X, Chen L, Li C, et al. High average power spectral beam combining employing volume Bragg gratings [J]. High Power Laser and Particle Beams, 2015, 27(7): 071012.
[109]

Zhou T, Liang X, Li C, et al. Spectral beam combining of fiber lasers by using reflecting volume Bragg gratings [J]. Chin Phys Lett, 2016, 33(12): 124205.
[110]

Ma Yi, Yan Hong, Tian Fei, et al. Common aperture spectral beam combination of fiber lasers with 5 kW power high-efficiency and high-quality output [J]. High Power Laser and Particle Beams, 2015, 27(4): 7-9. (in Chinese)
[111]

Jiang M, Ma P, Zhou P, et al. Spectral beam combining of fiber laser with wavelength separation broader than 60 nm [J]. Laser Physics, 2016, 26: 115104.
[112]

Wang X, Jin X, Zhou P, et al. 105 W ultra-narrowband nanosecond pulsed laser at 2 μm based on a monolithic Tm-doped fiber MOPA [J]. Opt Express, 2015, 23(4): 4233-4241.
[113]

Jin X, Lou Z, Zhang H, et al. Random distributed feedback fiber laser at 2.1 μm [J]. Opt Lett, 2016, 41(21): 4923-4926.
[114]

Jin X, Lee E, Luo J, et al. High-efficiency ultrafast Tm-doped fiber amplifier based on resonant pumping [J]. Opt Lett, 2018, 43(7): 1431-1434.
[115]

Sims R A, Willis C C C, Kadwani P, et al. Spectral beam combining of 2 μm Tm fiber laser systems [J]. Opt Commun, 2011, 284: 1988-1991.
[116]

Yilmaz S, Ottenhues C, Theeg T, et al. Single-mode spectral beam combining of high power Tm-doped fiber lasers with WDM cascades [C]//SPIE, 2016, 9728: 97280O.
[117]

Limpert J, Röser F, Klingebiel S, et al. The rising power of fiber lasers and amplifiers [J]. IEEE J Sel Top Quantum Electron, 2007, 13(3): 537-545.
[118]

Liu A, Mead R, Vatter T, et al. Spectral beam combining of high power fiber lasers[C]//SPIE 2004, 5335: 81-88.
[119]

Madasamy P, Jander D R, Brooks C D, et al. Dual-grating spectral beam combining of high-power fiber lasers [J]. IEEE J Sel Top Quantum Electron, 2009, 15(2): 337-343.
[120]

Su Rongtao, Ma Pengfei, Wang Xiaolin, et al. 2.43kw power output of linearly polarized narrow linewidth single mode fiber amplifier [J]. Chinese Journal of Lasers, 2017, 44(3): 0315001. (in Chinese)
[121]

Ma P, Xiao H, Meng D, et al. High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression [J]. High Power Laser Science and Engineering, 2018, 6: e57.
[122]

Platonov N, Yagodkin R, Cruz J, et al. 1.5 kW linear polarized on PM fiber and 2 kW on non-PM fiber narrow linewidth CW diffraction-limited fiber amplifier [C]//SPIE, 2017, 10085: 100850M.
[123]

Ma Yi, Yan Hong, Sun Yinhong, et al. Recent progress of key technologies for spectral beam combining of fiber laser with dual-gratings configuration [J]. Infrared and Laser Engineering, 2018, 47(1): 0103002. (in Chinese)
[124]

Andrusyak O, Smimov V, Venus G, et al. Applications of volume Bragg gratings for spectral control and beam combining of high power fiber lasers [C]//SPIE, 2009, 7195: 71951Q.
[125]

Fan T Y, Goyal A, Sanchez A. Higher power spectrally combined laser systems and related methods. US Patent 6, 697, 192, Feb. 24, 2004.
[126]

Fridman M, Eckhouse V, Davidson N, et al. Simultaneous coherent and spectral addition of fiber lasers [J]. Opt Lett, 2008, 33: 648-650.
[127]

Jain A, Drachenberg D, Andrusyak O, et al. Coherent and spectral beam combining of fiber lasers using volume Bragg gratings [C]//SPIE, 2010, 7686: 768615.
[128]

Ma P, Jiang M, Wang X, et al. Hybrid Beam Combination by active phasing and bandwidth-controlled dichromatic mirror [J]. IEEE Photonics Technology Letters, 2015, 27(19): 2099-2102.
[129]

Yan H, Man Y, Sun Y, et al. Scalable hybrid beam combining of kilowatt fiber amplifiers into a 5-kW beam [J]. Opt Commun, 2017, 397: 95-99.
[130]

McNaught S J, Asman C P, Injeyan H, et al. 100-kW coherently combined Nd: YAG MOPA laser array [C]//Frontiers in Optics 2009/Laser Science XXV/Fall 2009 OSA Optics &Photonics Technical Digest, 2009: FThD2.
[131]

Lim Y L, Dean P, Nikolic M, et al. Demonstration of a self-mixing displacement sensor based on terahertz quantum cascade lasers [J]. Applied Physics Letters, 2011, 99(8): 156-1.
[132]

Grant P D, Laframboise S R, Dudek R, et al. Terahertz free space communications demonstration with quantum cascade laser and quantum well photodetector [J]. Electronics Letters, 2009, 45(18): 952-954.
[133]

Abramov P I, Kuznetsov E V, Skvortsov L A, et al. Skvortsova. Quantum-Cascade Lasers in Medicine and Biology (Review) [J]. Journal of Applied Spectroscopy, 2019, 86(1): 1-26.
[134]

Liang G, Liu T, and Wang Q J. Recent Developments of Terahertz Quantum Cascade Lasers [J]. IEEE Journal of Selected Topics in Quantum Electronics, 2017, 23(4): 1-18.
[135]

Han Y J, Partington J, Pun R C, et al. Gas spectroscopy through multimode self-mixing in a double-metal terahertz quantum cascade laser [J]. Opt Lett, 2018, 43(24): 5933-5936.
[136]

Chen X, Liu X, Guo X, et al. THz near-field imaging of extreme subwavelength metal structures [J]. ACS Photonics, 2020, 7(3): 687-694.
[137]

Köhler R, Tredicucci A, Beltram F, et al. Terahertz semiconductor-heterostructure laser [J]. Nature, 2002, 417: 156.
[138]

Williams B S. Terahertz quantum-cascade lasers [J]. Nature Photonics, 2007, 1: 517-525.
[139]

Deutsch C, Kainz M A, Krall M, et al. High-Power Growth-Robust InGaAs/InAlAs Terahertz Quantum Cascade Lasers [J]. Acs Photonics, 2017, 4(4): 957-962.
[140]

Zhu H, Zhu H, Wang F, et al. Terahertz master-oscillator power-amplifier quantum cascade laser with a grating coupler of extremely low reflectivity [J]. Opt Express, 2018, 26(2): 1942-1953.
[141]

Jin Y, Zhu Q, Reno J L, et al. High power edge-cum-surface emitting terahertz laser arrays phased locked by vacuum guided plasmon waves [J]. Applied Physics Letters, 2020, 116: 131103.
[142]

Jin Y, Reno J L, Kumar S. Phase-locked terahertz plasmonic laser array with 2 W output power in a single spectral mode [J]. Optica, 2020, 7(6): 708-715.
[143]

Kao T, Hu Q, Reno J L. Phase-locked arrays of surface-emitting terahertz quantum-cascade lasers [J]. Applied Physics Letters, 2010, 96: 101106.