[1] Stickley C M, Filipkowski M E, Parra E. Overview of progress in super high efficiency diodes for pumping high energy lasers[C]. SPIE, 6104, 610405(2006).

[2] Bachmann F. Goals and status of German national research initiative BRIOLAS (brilliant diode lasers)[C]. SPIE, 6456, 645608(2007).

[3] Gao X, Ohashi H, Saitoh M et al. Beam combining for three high-power laser-diode stacks with a stripe mirror technique[J]. Japanese Journal of Applied Physics, 43, L1097-L1098(2004). http://ci.nii.ac.jp/naid/150000013261

[4] Tan H, Guo L H, Gao S X et al. Experimental study on fiber coupling based on polarization folding[J]. Laser & Infrared, 44, 361-365(2014).

[5] Li L B, Lou Q H. Spectral combining techniques of fiber lasers[J]. Lasers & Optoelectonics Progress, 43, 37-41(2006).

[6] Zhou Z P, Gao X, Bo B X et al. Fiber coupling analysis of muti-chip laser diodes[J]. High Power Laser and Particle Beams, 26, 031013(2014).

[7] Huang R K, Chann B, Burgess J et al. Direct diode lasers with comparable beam quality to fiber, CO2, and solid state lasers[C]. SPIE, 8241, 824102(2012).

[8] Heinemann S, Fritsche H, Kruschke B et al. Compact high brightness diode laser emitting 500 W from a 100 um fiber[C]. SPIE, 8605, 86050Q(2013).

[9] Liu B, Zhang X, Han J T et al. Wavelength beam combining of laser diode array by wavelength λ-chirped volume Bragg grating external cavity[J]. High Power Laser and Particle Beams, 20, 1057-1062(2008).

[10] Liu B, Li Q, Zhang X et al. Wavelength beam combining of laser diode array to get 20 W CW circle spot emission[J]. High Power Laser and Particle Beams, 21, 1633-1638(2009).

[11] Zhu Z D, 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]. Optics Express, 22, 17804-17809(2014). http://europepmc.org/abstract/med/25089401

[12] Zhang J, Peng H Y, Fu X H et al. CW 50 W/M 2=10.9 diode laser source by spectral beam combining based on a transmission grating [J]. Optics Express, 21, 3627-3632(2013). http://www.ncbi.nlm.nih.gov/pubmed/23481819

[13] Peng H Y, Zhang J, Fu X H et al. High-efficiency external cavity spectral-beam-combined diode laser array[J]. Chinese Journal of Lasers, 40, 0702015(2013).

[14] Zhang Y, Zhang B. Analysis of the spectral beam combining efficiency of diode laser[J]. Infrared and Laser Engineering, 38, 864-872(2009).

[15] Yu Y, Wang W M, Lu Y H et al. Simulation of spectrally beam combined diode laser based on grating-cavity[J]. High Power Laser and Particle Beams, 20, 189-192(2008).

[16] Meng H C, Wu D Y, Tan H 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, 42, 0302003(2015).

[17] Meng H C, Tan H, Li J M et al. Development of spectral beam combining of diode laser by grating and external cavity[J]. Laser & Optoelectronics Progress, 52, 020003(2015).

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

[20] Hengesbach S, Klein S, Holly C et al. Simultaneous frequency stabilization and high-power dense wavelength division multiplexing (HP-DWDM) using an external cavity based on volume Bragg gratings (VBGs)[C]. SPIE, 9733, 97330K(2016).

[21] Witte U, Traub M, Di Meo A et al. Compact 35 um fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini-bars[C]. SPIE, 9733, 97330H(2016).

[22] Holly C, Westphalen T, Traub M et al. High power dense wavelength division multiplexing (HP-DWDM) of frequency stabilized 9xx diode laser bars with a channel spacing of 1.5 nm[C]. SPIE, 8965, 89650C(2014).

[23] Hengesbach S, Klein S, Traub M et al. Simultaneous frequency stabilization, wavelength multiplexing and improvement of beam quality using a self-optimizing external cavity diode laser[J]. Optics Letters, 41, 595-598(2016). http://europepmc.org/abstract/MED/26907432

[24] Hengesbach S, Witte U, Traub M et al. Design of a DFB/DBR Diode Laser Module including spectral multiplexing based on VBGs[C]. High Power Diode Lasers and Systems Conference, 14029598(2013).

[26] Hieta T, Vainio M, Moser C et al. External-cavity lasers based on a volume holographic grating at normal incidence for spectroscopy in the visible range[J]. Optics Communications, 282, 3119-3123(2009). http://www.sciencedirect.com/science/article/pii/S0030401809004180

[27] 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]. Optics Letters, 38, 3154-3157(2013). http://www.ncbi.nlm.nih.gov/pubmed/24104674

[28] Yang L, Wu Z, Zhong Z et al. Effect of crosstalk on combined beam characteristics in spectral beam combining systems[J]. Optics Communications, 384, 30-35(2017). http://www.sciencedirect.com/science/article/pii/S0030401816308562

[29] Andrusyak O G. Dense spectral beam combing with volume Bragg gratings in photo-thermo-refractive glass[D]. Orlando: University of Central Florida(2004).

[30] Wang H, Yuan X, Zhang X et al. Influence of volume Bragg grating reflectivity on spectrum of external cavity laser diode array[J]. Chinese Journal of Lasers, 39, 0602004(2012).

[31] Zhang X. Angular filtering and beam control with volume Bragg gratings[D]. Wuhan: Huazhong University of Science & Technology(2011).

[32] Feng Y. The relationship of angular, wavelength sensitivities and grating parameters in volume Bragg gratings[D]. Wuhan: Huazhong University of Science & Technology(2011).

[33] Haas M, Killi A, Tillkorn C et al. Thin-film filter, wavelength-locked, multi-laser cavity for dense wavelength beam combining of broad-area laser diode bars[J]. Optics Letters, 40, 3949-3952(2015). http://www.opticsinfobase.org/abstract.cfm?uri=ol-40-17-3949

[34] Kruschke B, Fritsche H, Kern H et al. Beam combining techniques for high-power high-brightness diode lasers[C]. SPIE, 9346, 934614(2015).

[35] Fan T Y, Sanchez A, Daneu V et al. Laser beam combining for power and brightness scaling[C]. IEEE Aerospace, 3, 49-54(2000).

[36] Huang R K, Chann B, Tayebati P. Direct diode lasers for industrial sheet metal cutting and welding[C]. Photonics Conference (IPC), 232-233(2014).

[37] Huang R K, Chann B, Burgess J et al. Teradiode's high brightness semiconductor lasers[C]. SPIE, 9730, 97300C(2016).

[38] Tayebati P, combining systems, methods: US20160268761 A1[P]. -09-15)[2016-07-10](2016). https://www.google.com/patents/US20160268761.

[39] Nippgen S, Hengesbach S, Traub M et al. Apodized holographic beam combiners for dense wavelength multiplexing based on Gaussian-beam interference[J]. Optics Letters, 37, 5205-5207(2012). http://www.opticsinfobase.org/abstract.cfm?uri=ol-37-24-5205

[40] Nippgen S, Hengesbach S, Traub M et al. Apodized holographic beam combiners for dense wavelength multiplexing based on Gaussian-beam interference[J]. Optics Letters, 37, 5205-5207(2012). http://www.opticsinfobase.org/abstract.cfm?uri=ol-37-24-5205

[41] Witte U, Rubel D, Traub M et al. Dense wavelength multiplexing and 35um-fiber coupling of wavelength chirped high power diode laser bars[C]. Advanced Solid State Lasers, AF1A, 6(2015).

[42] 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, 230-231(2014).

[43] Zimer H, Haas M, Nagel S et al. Spectrally stabilized and combined diode lasers[C]. High Power Diode Lasers and Systems Conference (HPD), 31-32(2015).

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

[45] Wang L J, Peng H Y, Zhang J et al. Development of beam combining of high power high brightness diode lasers[J]. Infrared and Laser Engineering, 46, 1-10(2017).

[46] Meng H, Sun T, Tan H et al. High-brightness spectral beam combining of diode laser array stack in an external cavity[J]. Optics Express, 23, 21819-21824(2015). http://europepmc.org/abstract/MED/26368158

[47] Lu F. Theoretical and experimental study on spectrual beam combining of diode laser based on grating external cavity. C]. 2015 Annual Report of China Academy of Engineering Physics(II)., 2, 192-193(2015).

[48] 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 Physics Letters, 14, 045811(2017). http://adsabs.harvard.edu/abs/2017LaPhL..14d5811M

[49] Meng H, Ruan X, Wang Z et al. Spectral bandwidth narrowing of high brightness spectral beam combining diode laser[J]. IEEE Photonics Journal, 9, 16772281(2017). http://ieeexplore.ieee.org/document/7867857/

[50] Yang L, Wu Z, Zhong Z et al. Effect of crosstalk on combined beam characteristics in spectral beam combining systems[J]. Optics Communications, 384, 30-35(2017). http://www.sciencedirect.com/science/article/pii/S0030401816308562

[51] Zhan S, Wu Z, Zhang J et al. Comparison of spectral beam combining based on an external cavity with and without microlens array[J]. Optics & Laser Technology, 77, 215-220(2016). http://www.sciencedirect.com/science/article/pii/S0030399215002789

[52] Zhan S, Wu Z, He F et al. Influence of transform-lens focal length on spectral beam combining in an external cavity with a microlens array[J]. Optics Communications, 387, 223-229(2017). http://www.sciencedirect.com/science/article/pii/S0030401816310525