Abstract
Near-infrared nanosecond (ns) single-longitudinal-mode (SLM) pulse light generated from an optical parametric oscillator (OPO) is an important source in nonlinear optics and high-precision spectral analysis. In this Letter, a stable SLM near-infrared ns pulse light source generated from the OPO is presented, which is achieved by developing a seed-injection automatic locking technique based on a pulse-integrated photodetector (PIPD). Depending on the PIPD, the peak power of the pulse light detected by the photodiode is converted to the average power by integrating several pulses. As a result, the detector saturation is thoroughly eliminated, and the interference signal including the resonance point between seed and pulse lights can easily be attained by scanning the resonator length. On this basis, a microcontroller unit (MCU) is employed to realize automatic locking by looking for the minimum value of the interference signal. Finally, a SLM 824 nm pulse light source with an output power of 20.5 W and a linewidth of 51.42 MHz is obtained. The presented method can pave the way to implement a low-cost and compact high-average-power SLM pulse OPO.
Funder
National Natural Science Foundation of China
National Key Research and Development Program of China
The first Lab-National Innovation Center (Shanxi) science and technology innovation project
Fund for Shanxi "1331 Project" Key Subjects Construction
Research Project Supported by Shanxi Scholarship Council of China
Applied Basic Research Project of Shanxi Province
Program for the Innovative Talents of High Education Institution of Shanxi
Special fund for Science and Technology Innovation Teams of Shanxi Province
Shanxi Province Patent Conversion Project