Simultaneous single-frequency oscillations on different transitions and antiphase relaxation oscillation dynamics in laser-diode-pumped microchip LiNdP/sub 4/O/sub 12/ lasers

Simultaneous single-frequency oscillations on different transitions have been observed experimentally in a laser-diode-pumped microchip LiNdP/sub 4/O/sub 12/ laser. The peculiar modal input-output characteristics and the antiphase relaxation oscillation dynamics have been reproduced theoretically using rate equations, including the strong spatial localization of population inversions, cross saturation, and resonant reabsorption loss in an unpumped region brought about by the inherent high Nd concentrations.