High-average-power single-frequency pulse optical parametric oscillator based on pulse-integrated seed-injection...

Area of Science:

• Nonlinear Optics
• Laser Physics
• Spectroscopy

Background:

• Single-longitudinal-mode (SLM) near-infrared nanosecond (ns) pulse light from optical parametric oscillators (OPOs) is crucial for nonlinear optics and high-precision spectral analysis.
• Existing methods for achieving stable SLM OPO output often face challenges with detector saturation and complex control mechanisms.

Purpose of the Study:

• To develop a stable and reliable method for generating SLM near-infrared ns pulse light from an OPO.
• To overcome limitations of previous techniques, particularly detector saturation, for improved spectral analysis and nonlinear optics applications.

Main Methods:

• Implementation of a seed-injection automatic locking technique utilizing a pulse-integrated photodetector (PIPD).
• The PIPD converts peak pulse power to average power by integrating multiple pulses, preventing detector saturation.
• A microcontroller unit (MCU) is employed to automatically lock the OPO by identifying the minimum interference signal during resonator length scanning.

Main Results:

• A stable SLM 824 nm ns pulse light source was successfully generated.
• The OPO achieved an output power of 20.5 W with a narrow linewidth of 51.42 MHz.
• The developed technique effectively eliminated detector saturation, enabling precise control and signal acquisition.

Conclusions:

• The presented seed-injection automatic locking technique offers a robust solution for stable SLM OPO operation.
• This method facilitates the development of low-cost, compact, and high-average-power SLM pulse OPOs.
• The findings have significant implications for advancing high-precision spectral analysis and nonlinear optical applications.