Categories
Works

Random stack of resonant dielectric layers as a laser system

Opt. Exp.Vol. 12, No. 15 July 26, 2004 Page: 3307 – 3312

Yan Feng and Ken-ichi Ueda, University of Electro-Communications

We propose a random stack of resonant dielectric layers as a system for random-laser study. Owing to the Fabry–Perot resonance of the dielectric layers, the propagation of light in such systems is frequency dependent (a band structure). As a consequence, if the system is designed such that pump light is in passband while optical gain is in stop band, the laser threshold can be reduced dramatically compared with those of completely disordered systems.

Categories
Works

Multiple-color cw visible lasers by frequency sum-mixing in a cascading Raman fiber laser

Multiple-color cw visible lasers by frequency sum-mixing in a cascading Raman fiber laser

Yan Feng, Shenghong Huang, Akira Shirakawa, and Ken-ichi Ueda, University of Electro-Communications

Multiple cw visible lasers at wavelengths ranging from 550nm to 625nm were generated by intracavity frequency sum-mixing of a cascading Raman fiber laser in a type-I noncritically phase-matched lithium triborate crystal. The phase matching conditions for individual wavelengths were realized by tuning the temperature of the lithium triborate crystal.