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09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Continuous-wave, two-crystal, singly-resonant optical parametric oscillator: theory and experiment.
G K Samanta1, A Aadhi, M Ebrahim-Zadeh
1Theoretical Physics Division, Physical Research Laboratory, Navarangpura, Ahmedabad 380 009, India. gsamanta@prl.res.in
Optics Express
|April 24, 2013
Summary
This study introduces a two-crystal optical parametric oscillator (T-SRO) for high-power laser generation. The T-SRO design enhances pump power handling and reduces crystal damage, achieving 6.5 W output power.
Area of Science:
- Nonlinear Optics
- Laser Physics
- Materials Science (MgO:sPPLT)
Background:
- Singly-resonant optical parametric oscillators (SROs) are crucial for tunable coherent light generation.
- Scaling SROs to higher powers is limited by crystal damage and thermal effects.
- Dual-wavelength generation in optical parametric oscillators offers versatile applications.
Purpose of the Study:
- To theoretically and experimentally investigate a continuous-wave, two-crystal, singly-resonant optical parametric oscillator (T-SRO).
- To analyze the performance of the T-SRO, including threshold reduction, gain bandwidth, and wavelength separation.
- To demonstrate the high-power capabilities and novel measurement techniques enabled by the T-SRO scheme.
Main Methods:
- Utilized two identical 30-mm MgO:sPPLT crystals in a four-mirror ring cavity.
- Employed two separate green pump beams.
- Solved coupled amplitude equations under the undepleted pump approximation for theoretical analysis.
- Experimentally verified performance, including output power and spectral characteristics.
Main Results:
- Achieved a total output power of 6.5 W with 16.2 W of green pump power (532 nm).
- Demonstrated that the T-SRO has the same acceptance bandwidth as a single-crystal SRO.
- Showcased the ability to handle higher total pump power, reducing crystal damage risk and thermal effects.
- Observed coherent energy coupling between intra-cavity resonant signal waves, producing Raman spectral lines.
- Reported a new technique for measuring the temperature acceptance bandwidth of a single-pass parametric amplifier.
Conclusions:
- The T-SRO design effectively enhances high-power operation of optical parametric oscillators.
- The T-SRO scheme offers advantages in pump power handling and crystal longevity.
- The T-SRO enables novel diagnostic techniques for nonlinear optical processes.
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