Abstract
High-power all-solid-state single-frequency continuous-wave (CW) lasers have been applied in basic research such as atomic physics, precision measurement, radar and laser guidance, as well as defense and military fields owing to their intrinsic advantages of high beam quality, low noise, narrow linewidth, and high coherence. With the rapid developments of sciences and technologies, the traditional single-frequency lasers cannot meet the development needs of emerging science and technology such as quantum technology, quantum measurement and quantum optics. After long-term efforts and technical research, a novel theory and technology was proposed and developed for improving the whole performance of high-power all-solid-state single-frequency CW lasers, which was implemented by actively introducing a nonlinear optical loss and controlling the stimulated emission rate (SER) in the laser resonator. As a result, the output power, power and frequency stabilities, tuning range and intensity noise of the single-frequency lasers were effectively enhanced.
Highlights
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
When the incident pump power of the all-solid-state single-frequency CW laser is increased to scale up the output power, the mode competition becomes so intense that the multi-longitudinal mode (MLM) and mode hopping are occurred and observed
It was clear that the nonlinear loss was large enough to suppress the oscillation of nonlasing modes and the mode hopping when the transmission of the output coupler was lower than 19% and the designed laser could well work with long-term stable SLM operation
Summary
When the incident pump power of the all-solid-state single-frequency CW laser is increased to scale up the output power, the mode competition becomes so intense that the multi-longitudinal mode (MLM) and mode hopping are occurred and observed. According to the parameters of the designed laser resonator and Equation (1), the relationship between the normalized linear and nonlinear losses was theoretical predicted and the critical condition for SLM and MLM operation of the solid-state laser resonator was obtained. After deliberately introducing the nonlinear loss to the laser resonator to realize the SLM operation of a single-frequency laser, a dual-wavelength single-frequency laser was quickly achieved In this case, the output powers of the fundamental-wave and secondharmonic-wave lasers were decided by the intracavity linear and nonlinear losses when the incident pump power was ensured. Depending on the measured intracavity linear loss, the incident pump power of the designed single-frequency laser increased to 113 W, the transmission of the output coupler was optimized to 25%, and an all-solid-state single-frequency CW 1064 nm laser was achieved [24] with a maximum output power up to 50.3 W. Reprinted with permission from [25] c The Optical Society
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