Simultaneous single-frequency oscillations on different transitions in a laser-diode-pumped LiNdP(4)O(12) laser

Simultaneous single-mode oscillations on different transitions were observed in a laser-diode-pumped microchip LiNdP(4)O(12) laser. The unusual modal-output characteristics of the laser were reproduced by multitransition-oscillation laser model equations that include cross saturation of population inversions with a strong spatial exponential decay and transition-dependent resonant reabsorption loss.