Dynamical instability, chaotic pulsations, and generalized bistability have been observed in a laser-diode-pumped microchip Nd:YAG laser operating in a double transition scheme in which lasing occurs on two transitions with overlapping gain profiles, F<sub>3/2</sub><sup>4</sup>(2)→ I<sub>11/2</sub><sup>4</sup>(3) and F<sub>3/2</sub><sup>4</sup>(1)→ I<sub>11/2</sub><sup>4</sup>(2), and simultaneously involves excited Nd atoms from different sublevels of the upper manifold. The modeling of the experimental results requires rate equations that include cross-gain coupling among oscillating modes that belong to different transitions whose population inversion densities are determined by the Boltzmann distribution.
© 2001 Optical Society of America
Kenju Otsuka, Jing-Yuan Ko, Tamaki Kubota, Siao-Lung Hwong, Tsong-Shin Lim, Jyh-Long Chern, Ba An Nguyen, and Paul Mandel, "Instability in a laser-diode-pumped microchip Nd:YAG laser in a n-ary product scheme," Opt. Lett. 26, 1060-1062 (2001)