Abstract

We report, for the first time to our knowledge, a radially polarized and passively Q-switched Yb-doped fiber laser. By using a Cr4+:YAG crystal as a saturable absorber and a photonic crystal grating as a polarization mirror, a radially polarized pulse is produced, which has 202W of peak power, 75ns duration, and ~92% polarization purity at a 56.6kHz repetition rate. The Q-switched pulse with radial polarization from the fiber laser would facilitate numerous applications.

© 2010 Optical Society of America

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