Spectrum broadening in optical frequency-shifted feedback Nd:YVO...

The influence of feedback level and shifted frequency on laser spectrum and power spectrum is investigated experimentally and theoretically. Due to optical frequency-shifted feedback, the spectrum of Nd:YVO4 microchip laser is expanded into one with multi equal-spaced sidebands around its initial central frequency. The detail of expanded spectrum depends on both the shifted frequency and relaxation oscillation frequency. Optical feedback level decides the possible maximum spectrum range. Neverth