Related Experiment Video
Updated: Jul 4, 2025
10:17
20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
Published on: July 12, 2017
11.5K
Narrowband, intracavity-pumped, type-II BaGa2GeSe6 optical parametric oscillator
Optics Express
|February 1, 2024
Summary
We developed a tunable optical parametric oscillator for mid-infrared light generation. This system achieves 1.1 mJ of energy near 8 µm with a narrow spectral width using a novel cascade design and Volume Bragg Grating for spectral control.
Area of Science:
- Optics and Photonics
- Nonlinear Optics
- Laser Physics
Background:
- Optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
- Cascade OPOs offer enhanced nonlinear conversion but require careful design for efficiency and spectral control.
Purpose of the Study:
- To demonstrate a tunable, singly-resonant, cascade optical parametric oscillator (OPO).
- To achieve spectral narrowing in the mid-infrared (mid-IR) region.
- To investigate intracavity pumping and Volume Bragg Grating (VBG) spectral control.
Main Methods:
- Utilized a cascade OPO configuration with BaGa₂GeSe₆ as the nonlinear crystal.
- Employed intracavity pumping in the second stage of the OPO.
- Implemented a Volume Bragg Grating (VBG) for spectral narrowing of the signal wave from the first stage.
Main Results:
- Achieved tunable output from 6.62 to 11.34 µm.
- Obtained maximum energy of 1.1 mJ near 8 µm in the narrowband regime (spectral width ~20 cm⁻¹, pulse duration ~7 ns) at 100 Hz.
- Reported overall conversion efficiencies of 4.0% (broadband) and 3.1% (narrowband) from 1 to 8 µm.
Conclusions:
- The demonstrated cascade OPO design enables efficient, tunable mid-IR generation with spectral control.
- Intracavity pumping and VBG spectral narrowing are effective strategies for enhancing OPO performance.
- This work provides a robust platform for mid-IR applications requiring narrowband, high-energy pulses.
