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Tunable narrow-linewidth high-peak-power sub-nanosecond optical parametric generator by injection seeding
Optics Express
|October 12, 2022
Summary
We developed a cost-effective tunable optical parametric generator (OPG) using injection seeding. This laser system achieves high peak power and a narrow linewidth, making it suitable for applications like lidar and spectroscopy.
Area of Science:
- Nonlinear Optics
- Laser Physics
Background:
- Optical Parametric Generators (OPGs) are crucial for tunable coherent light generation.
- Achieving narrow linewidths and high peak powers simultaneously in OPGs presents a significant challenge.
Purpose of the Study:
- To develop an efficient, tunable optical parametric generator (OPG) with a linewidth near the Fourier transform limit.
- To demonstrate the benefits of injection seeding a non-resonant OPG system.
Main Methods:
- Utilized injection seeding with a tunable diode laser.
- Employed a high-peak-power sub-nanosecond (426 ps) laser for pumping.
- Used a high-gain MgO-doped periodically poled lithium niobate (PPMgLN) crystal.
Main Results:
- Achieved a signal peak power of 0.343 MW at 1638 nm.
- Reached a total conversion efficiency of 47.9% at a 1-kHz pulse repetition rate.
- Demonstrated a tunable OPG signal range of 1510-1638 nm with a GHz-level linewidth, two orders of magnitude narrower than unseeded OPGs.
Conclusions:
- Injection seeding offers a robust and cost-effective method for narrow-linewidth OPGs without complex cavity electronics.
- The developed compact, tunable PPMgLN OPG with high performance is significant for lidar and spectroscopy.
