[1] Perry M D, Banks P S, Zweiback Jet al. Laser containing a distributed gain medium: U.S. -8-30[P]. 937, 629.(2005).

[2] Fu X, Liu Q, Li P. et al. Numerical simulation of 30-kW class liquid-cooled Nd∶YAG multi-slab resonator[J]. Optics Express, 23, 18458-18470(2015). http://www.ncbi.nlm.nih.gov/pubmed/26191904

[3] Fu X, Liu Q, Li P et al. Direct-liquid-cooled Nd∶YAG thin disk laser oscillator[J]. Applied Physics B, 111, 517-521(2013). http://link.springer.com/article/10.1007/s00340-013-5366-9

[4] Fu X, Li P, Liu Q et al. 3 kW liquid-cooled elastically-supported Nd∶YAG multi-slab CW laser resonator[J]. Optics Express, 22, 18421-18432(2014). http://www.opticsinfobase.org/abstract.cfm?URI=oe-22-15-18421

[5] Zhang Z, Liu Q, Nie M et al. Experimental and theoretical study of the weak and asymmetrical thermal lens effect of Nd∶YLF crystal for σ and π polarizations[J]. Applied Physics B, 120, 689-696(2015). http://link.springer.com/article/10.1007/s00340-015-6184-z

[6] Zheng D, Xu J, Liu W et al. Spectral Analysis and Growth of Nd∶YLF Crystal. [C]//Asia-Pacific Energy Equipment Engineering Research Conference(2015).

[7] Pollak T M, Wing W F, Grasso R J et al. CW laser operation of Nd∶YLF[J]. IEEE Journal of Quantum Electronics, 18, 159-163(1982).

[8] Murray J E. Pulsed gain and thermal lensing of Nd∶LiYF4[J]. IEEE Journal of Quantum Electronics, 19, 488-491(1983). http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1071924

[9] Ma Z, Gao J, Li D et al. Thermal stress effects of the diode-end-pumped Nd∶YLF slab[J]. Optics Communications, 281, 3522-3526(2008). http://www.sciencedirect.com/science/article/pii/S0030401808002423

[10] Pollnau M, Hardman P J, Kern M A et al. Upconversion-induced heat generation and thermal lensing in Nd∶YLF and Nd∶YAG[J]. Physical Review B, 58, 16076-16092(1998). http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000058000024016076000001&idtype=cvips&gifs=Yes

[11] Ye Z, Liu C, Tu B et al. Kilowatt-level direct-'refractive index matching liquid'-cooled Nd∶YLF thin disk laser resonator[J]. Optics Express, 24, 1758-1772(2016). http://europepmc.org/abstract/MED/26832554

[12] Ligrani P M, Niver R D. Flow visualization of Dean vortices in a curved channel with 40 to 1 aspect ratio[J]. Physics of Fluids, 31, 3605-3617(1988). http://scitation.aip.org/content/aip/journal/pof1/31/12/10.1063/1.866877

[13] Mehta R D. The aerodynamic design of blower tunnels with wide-angle diffusers[J]. Progress in Aerospace Sciences, 18, 59-120(1979). http://www.sciencedirect.com/science/article/pii/0376042177900033

[14] Han L S. Hydrodynamic entrance lengths for incompressible laminar flow in rectangular ducts[J]. Journal of Applied Mechanics, 27, 403-409(1960). http://adsabs.harvard.edu/abs/1960JAM....27..403H

[15] Moonen P, Blocken B, Carmeliet J. Indicators for the evaluation of wind tunnel test section flow quality and application to a numerical closed-circuit wind tunnel[J]. Journal of Wind Engineering and Industrial Aerodynamics, 95, 1289-1314(2007). http://www.sciencedirect.com/science/article/pii/S0167610507000487

[16] Moonen P, Blocken B, Roels S et al. Numerical modeling of the flow conditions in a closed-circuit low-speed wind tunnel[J]. Journal of Wind Engineering and Industrial Aerodynamics, 94, 699-723(2006). http://www.sciencedirect.com/science/article/pii/S0167610506000341

[17] Mehta R D, Bradshaw P. Design rules for small low-speed wind tunnels[J]. Aeronautical Journal, 83, 443-449(1979). http://journals.cambridge.org/abstract_S0001924000031985