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Longwave infrared, single-frequency, tunable, pulsed optical parametric oscillator based on orientation-patterned
Optics Letters
|June 16, 2015
Summary
We developed a novel optical parametric oscillator using orientation-patterned GaAs for tunable mid-infrared laser generation. This device enables sensitive detection of ammonia gas, crucial for environmental monitoring.
Area of Science:
- Nonlinear Optics
- Laser Physics
- Materials Science
Background:
- Optical parametric oscillators (OPOs) are essential for generating tunable laser light.
- Achieving stable, single-frequency output in pulsed OPOs remains a challenge.
- Orientation-patterned semiconductors offer promising nonlinear optical properties.
Purpose of the Study:
- To demonstrate a nanosecond, single-frequency nested cavity optical parametric oscillator (NesCOPO).
- To utilize orientation-patterned GaAs (OP-GaAs) for mid-infrared generation.
- To assess the NesCOPO's potential for differential absorption lidar applications.
Main Methods:
- Fabrication of an OP-GaAs crystal.
- Construction of a dual-cavity, doubly-resonant NesCOPO.
- Pumping the NesCOPO with a pulsed single-frequency Tm:YAP microlaser.
- Utilizing Vernier spectral filtering for single-longitudinal-mode operation.
Main Results:
- Achieved a low threshold energy of 10 μJ.
- Demonstrated stable single-frequency emission in the 10.3-10.9 μm range.
- Successfully performed standoff detection of ammonia vapor at 10.4 μm.
- Showcased discrimination of interfering water vapor absorption.
Conclusions:
- The demonstrated NesCOPO based on OP-GaAs is a viable source for mid-infrared applications.
- Its single-frequency output and tunable range are suitable for differential absorption lidar.
- This technology advances standoff gas sensing capabilities.
