Development of diode-pumped Yb~(3+):doped crystal lasers for application in spectroscopy and metrology: two-wavelength and single mode operation

摘要

We demonstrate and investigate (theory, experiment) a peculiar mode of cw Yb~(3+):doped crystal laser operation when two emissions, at two independently tunable wavelengths, are simultaneously produced. Both emissions are generated from a single pumped volume and take place either in a single beam or in spatially separated beams. The laser employs original two-channel cavities that use a Passively Self-Injection Locking (PSIL) control to reduce the intracavity losses or a very simple for practical realization two near collinear channels cavity. A two-wavelength, single longitudinal mode generation is also obtained. The results reported are based on the example of Yb~(3+):GGG laser and Yb~(3+):YAG laser. The lasers operate in the range 1023-1033 nm and 1030-1040 nm, respectively with a total output power of ～ 0.4 W.