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Single Frequency Ytterbium Fiber Laser From Linear Cavity with Loop Mirror Filter

Japanese Journal of Applied Physics
Vol. 43, No. 10B, 2004, pp.L1379-L1381

Single Frequency Ytterbium Fiber Laser From Linear Cavity with Loop Mirror Filter
Shenghong Huang*, Yan Feng, Guanshi Qin, Akira Shirakawa, Mitsuru Musha and Ken-ichi Ueda

Single frequency ytterbium fiber laser was demonstrated by combining polariztion controller and loop mirror filter in linear laser cavity. Spatial hole burning effect was eliminated by adjusting polarization controller appropriately. The loop mirror with unpumped ytterbium fiber as a narrow bandpass filter can discriminate laser longitudinal modes efficiently. Output power up to 11.7 mW at 1064 nm were obtained for lauched pump power of 68 mW at 976 nm, the slope efficiency is about 22%.

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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.