We present comparative studies on laser performance of diode end-pumped, composite Nd:YAG rods with undoped ends at 946 nm. Efficient heat removal in a composite rod can reduce the peak of rise in temperature in the active segment to 61% by theoretical calculation. The maximum, continuous-wave output power of 1.5 W, which is three times higher than a conventional noncomposite rod, was obtained at an absorbed pump power of 8 W because of the 55 deg reduction in temperature rise that was estimated experimentally. The performance and characteristics of composite rods in quasi-three-level laser operation are analyzed and discussed in detail, taking into account the reduction in reabsorption loss, which is strongly temperature dependent.
© 1998 Optical Society of America
Original Manuscript: January 5, 1998
Revised Manuscript: March 30, 1998
Published: August 20, 1998
Masaki Tsunekane, Noboru Taguchi, and Humio Inaba, "Efficient 946-nm laser operation of a composite Nd:YAG rod with undoped ends," Appl. Opt. 37, 5713-5719 (1998)