High-power CW diode-side-pumped Nd:YAP laser at 1 341.4 nm

A high-power linearly polarized CW diode-side-pumped Nd:YAlO3(Nd:YAP) laser oscillating at 1 341.4 nm was reported. By analyzing the level structure and characteristics of transition in Nd:YAP crystal, the advantages of Nd:YAP crystal as a kind of working matter medium of 1.3 μm laser were displayed. Different output couplers for the laser were studied by experiment. Finally, a c-axis polarized laser with an output power as high as 121 W at 1 341.4 nm was obtained with a coupler transmittance of 6.5% at the maximum pumping power of 555 W. The beam quality factor was 34, the optical-optical efficiency was 21.8% and the optical slope efficiency was 41%. The a-axis polarized laser at 1 339.2 nm was also successfully obtained at the c-axis polarized laser being instable.