Progress of On-Chip Wavelength Stabilization of Laser Diodes for Seeding and Pumping of High-Power Solid-State and Fiber Lasers

摘要

In high-power continuous wave (CW) applications, system designers look for a reduction of the quantum defect to operate with less heat dissipation, lower risk of catastrophic damage, and enhanced conversion efficiency. The same features typically allow for reduced fiber length and nonlinearities in high peak power fiber amplifiers, enabling higher energy extraction and higher performance. However, such preferred wavelengths often have narrow absorption bandwidths and require pumping with narrow emission linewidth as well as accurate center wavelength, such as 1532 nm for Er:YAG [1]. Quasi-CW (Q-CW) operation of pump diodes would also greatly benefit from a reduced wavelength temperature coefficient, limiting thermal effects linked to steep variation in driving current and maintaining a narrow bandwidth required for efficient pumping.