Diode-Pumped CW Laser Operation of a c-cut Nd:YAlO 3 Crystal on Low-Gain Emission Lines Around 1.1 $\mu\textrm{m}$

We report on the diode-pumped continuous-wave laser operation of a c-cut Nd:YAlO 3 (YAP) laser crystal at various low gain emission wavelengths around 1.1 μm by using a simple and compact linear cavity and a glass etalon. Inserting and tilting the etalon in a particular position, single-wavelength operation at 1099 nm is achieved first, at low pump power, with a maximum output power value of 0.15 W. Then, increasing the pump power leads to dual-wavelength operation at 1079 and 1099 nm with a maximum output power value of 2.28 W and a laser slope efficiency value of about 20%. Further tilting the etalon, dual- and single-wavelength laser operations could be achieved, for the first time to our knowledge, at 1090 and 1106 nm. Single-wavelength laser operations at 1106 and 1090 nm are obtained with maximum output power values of 0.25 and 1.44 W, respectively, and simultaneous dual-wavelength lasing could be obtained with a maximum output power value of 1.89 W and a laser slope efficiency value of nearly 18%.