Effect of external feedback on lasing in random media

We have studied the effect of external feedback on random laser action in ZnO polycrystalline thin films. Reinjection of light into scattering-formed cavities strongly influences modes, intensity, and threshold of random lasers. We have compared the effect of external feedback from the side of the film and that from the film surface. Our study opens the possibility of controlling random laser frequencies by external feedback.

[1]  D. Weitz,et al.  Internal reflection of diffusive light in random media. , 1991, Physical review. A, Atomic, molecular, and optical physics.

[2]  R. Chang,et al.  Effect of laser intensity on the properties of carbon plasmas and deposited films , 1997 .

[3]  D. Wiersma,et al.  Experimental evidence for recurrent multiple scattering events of light in disordered media. , 1995, Physical review letters.

[4]  N. Lawandy,et al.  External-feedback effects in high-gain scattering media. , 1997, Optics letters.

[5]  Feng,et al.  Correlations and fluctuations of coherent wave transmission through disordered media. , 1988, Physical review letters.

[6]  Berkovits,et al.  Surface reflections and optical transport through random media: Coherent backscattering, optical memory effect, frequency, and dynamical correlations. , 1990, Physical review. B, Condensed matter.

[7]  N. Lawandy,et al.  Laser action in strongly scattering media , 1994, Nature.

[8]  H. C. Ong,et al.  Determination of the optical constants of zinc oxide thin films by spectroscopic ellipsometry , 1998 .

[9]  A. Lagendijk,et al.  Influence of internal reflection on diffusive transport in strongly scattering media , 1989 .

[10]  Alan B. Tveten,et al.  Feedback‐induced line broadening in cw channel‐substrate planar laser diodes , 1980 .

[11]  Berkovits,et al.  Geometric scaling of the optical memory effect in coherent-wave propagation through random media. , 1989, Physical review. B, Condensed matter.

[12]  Robert P. H. Chang,et al.  Ultraviolet lasing in resonators formed by scattering in semiconductor polycrystalline films , 1998 .

[13]  N. Lawandy,et al.  Interface reflection effects in photonic paint. , 1995, Optics letters.

[14]  A. Z. Genack,et al.  Scattering for super-radiation , 1994, Nature.