Based on the optical rotatory dispersion effect, an optical filter for selecting the second harmonic of a frequency-doubled laser is constructed from quartz in combination with polarizers. The operating principle is analyzed by matrix formulation, and the result indicates that the second harmonic of a frequency-doubled laser will be obtained when the rotation angle has a difference of (2n+1)'pi'/2 (n=0, 1, 2, 3, ...) between the two polarizations of the second-harmonic laser and the fundamental laser. The spectrum of the output laser is taken by the AQ-6315A spectrometer, and the experimental results are in good agreement with the theoretical results.
© 2007 Chinese Optics Letters
Shan Zhang, Fuquan Wu, Wendi Wu, and Haifeng Wang, "Quartz optical filter for wavelength selection of frequency-doubled laser based on optical rotatory dispersion effect," Chin. Opt. Lett. 5, 717-719 (2007)