Abstract

Nd-based gain media has more than 30 emission lines in the near infrared, potentially providing a very rich set of lines for multicolor laser operation. On the other hand, owing to the methods employed, most of the two-color laser experiments with Nd-systems demonstrated dual-wavelength operation in only one pair of wavelengths. In this work, we have numerically investigated the performance of off-surface optic axis crystal quartz birefringent filters (BRFs) as frequency selective elements in two-color laser operation of Nd-doped gain media. Our analysis has shown that a crystal quartz BRF with an optic axis diving by 25° into the plate could provide two-color laser operation in more than 40 pairs of Nd lines in properly designed cavities. The two-color operation wavelengths could be adjusted by simple rotation of the BRF about an axis normal to the surface. Fine adjustment of the angle via a motorized rotation stage fed by an error signal from a balanced detector could provide control of power in each lasing line. To our knowledge, such diversity in wavelength selection has not been achieved from any Nd-based system before, showing the potential of the method.

© 2018 Optical Society of America

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