We present what is to our knowledge the first theoretical and experimental estimation of the thermal characteristics of a composite Nd:YAG rod with an Al<sub>2</sub>O<sub>3</sub> (sapphire) end in diode-end-pumped geometry. The peak temperature rise in the active segment is calculated to be reduced to 66% and the focal length of the thermal lens was measured to be reduced by 20% compared with a noncomposite Nd:YAG rod. By using a composite rod we successfully demonstrated the improvement of high-power performance that is due to reduction of thermally induced birefringence, which has not been observed in a composite rod with an undoped YAG end.
© 1998 Optical Society of America
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3460) Lasers and laser optics : Lasers
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.6810) Lasers and laser optics : Thermal effects
Masaki Tsunekane, Noboru Taguchi, and Humio Inaba, "Reduction of Thermal Effects in a Diode-end-pumped, Composite Nd:YAG Rod with a Sapphire End," Appl. Opt. 37, 3290-3294 (1998)