For the first time to the authors' knowledge, laser activity has been achieved in low-phonon-energy, moisture-resistant bromide host crystals, neodymium-doped potassium lead bromide (Nd3+:KPb2Br5) and rubidium lead bromide (Nd3+:RbPb2Br5; RPB). Laser activity at 1.07 µm was observed for both crystalline materials. Laser operation at the new wavelengths 1.18 and 0.97 µm that resulted from the ^4 F_5/2 + H_9/2 - ^4 I_J transitions (J=13∕2 and J=11∕2) in Nd:RPB was achieved in a solid-state laser material. Rare-earth-doped MPb2Br5 (M = K, Rb) is a promising candidate for long-wavelength infrared applications because of its low phonon frequencies and other favorable features. In principle, Nd3+:MPb2Br5 has high potential for laser operation at new wavelengths as well as for the achievement of short-wavelength lasing as a result of upconversion.
© 2005 Optical Society of America
Katja Rademaker, Ernst Heumann, Günter Huber, Stephen A. Payne, William F. Krupke, Ludmila I. Isaenko, and Arnold Burger, "Laser activity at 1.18, 1.07, and 0.97 µm in the low-phonon-energy hosts KPb2Br5 and RbPb2Br5 doped with Nd3+," Opt. Lett. 30, 729-731 (2005)