[1] [1] Letokhov V S. Generation of light by scattering medium with negative resonance absorption [J]. Sov. Phys. JEPT, 1968, 26: 835.

[2] [2] Noginov M A, Messaoud B, et al. Study of absorption and reflection in soild-state random laser media [J]. Appl. Opt., 2004, 43(21): 4237-4243.

[3] [3] Cao H, Xu J Y, Chang S H. Transition from amplified spontaneous emission tolaser action in strongly scattering media [J]. Phys. Rev. E, 2000, 61(2): 1985-1989.

[4] [4] Cao H, Zhao Y G. Random laser action in semiconductor powder [J]. Phys. Rev. Lett., 1999, 82(11): 2278-2281.

[5] [5] Cao H. Lasing in random media [J]. Waves Random Media, 2003, 13: R1-R39.

[6] [6] Wang Chun, Liu Jinsong. Polarization dependence of lasing modes in two-dimensional random lasers [J]. Phys. Lett. A, 2006, 353(3): 269-272.

[7] [7] Sushil M, Marilena R, Renato T, et al. Amplified extended modes in random lasers [J]. Phys. Rev. Lett., 2004, 93(5): 053903.

[8] [8] Sushil M, Stefano C, et al. Temprature-tunable random lasing: numerical calculations and experiments [J]. J. Opt. Soc. Am. B, 2004, 21(1): 201-207.

[11] [11] Niginov M A, Bahoura M, Noginova N E, et al. Stimulated emission in scattering and composite dielectric media(random lasers):effect of particle size [C]. SPIE, 2003, 5218: 124-129.

[13] [13] Wolf P E, Maret G. Weak localization and coherent backscattering of photons in disordered media [J]. Phys. Rev. Lett., 1985, 55: 2696-2699.

[14] [14] van der Mark M B, van Albada M P, et al. Light scattering in strongly scattering and weak localization [J]. Phys. Rev. B, 1988, 37: 3575-3592.