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Monolithic optical parametric oscillator using chirped quasi-phase matching.

Karl A Tillman¹, Derryck T Reid

¹Ultrafast Optics Group, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK.

|June 5, 2007

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A novel monolithic optical parametric oscillator (OPO) achieves high efficiency using chirped gratings in lithium niobate. This compact, stable device demonstrates excellent pump-to-signal conversion for nanosecond pulse generation.

Area of Science:

Nonlinear optics
Laser physics
Materials science

Background:

Optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
Developing efficient, compact, and stable OPOs is an ongoing challenge.
Periodically poled lithium niobate (PPLN) is a key material for nonlinear optical devices.

Purpose of the Study:

To develop a highly efficient, monolithic, Q-switched nanosecond optical parametric oscillator.
To investigate the impact of longitudinal chirp in PPLN gratings on OPO performance.
To achieve high pump-to-signal conversion efficiency and specific pulse characteristics.

Main Methods:

Fabrication of a monolithic PPLN crystal with multiple quasi-phase-matched gratings, including unchirped and progressively chirped gratings.

Related Experiment Videos

Utilizing a Q-switched laser as the pump source for the optical parametric oscillator.

Characterization of the OPO's temporal and spectral performance using sonogram traces.

Main Results:

Demonstrated a monolithic, Q-switched nanosecond OPO with high efficiency.
Achieved a pump-to-signal conversion efficiency of approximately 50%.
Generated 50 microJ pulses at 1.55 microm with a 20 nm spectral bandwidth.
Presented sonogram traces illustrating the effect of crystal chirp on performance.

Conclusions:

The monolithic design enhances device compactness, stability, and robustness.
Longitudinal chirp in PPLN gratings can be effectively used to tailor temporal and spectral properties of OPO output.
The developed OPO represents a significant advancement in efficient nanosecond pulse generation.