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Picosecond synchronously pumped ZnGeP2 optical parametric oscillator.

Jean-Baptiste Dherbecourt¹, Antoine Godard, Myriam Raybaut

¹ONERA the French Aerospace Lab, Chemin de la Hunière 91761 Palaiseau, France. jean-baptiste.dherbecourt@onera.fr

|July 3, 2010

Summary

We demonstrate a picosecond optical parametric oscillator using a zinc germanium phosphide (ZGP) crystal. This device efficiently generates tunable mid-infrared laser pulses, achieving up to 800 mW of average power.

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Area of Science:

Optics and Photonics
Nonlinear Optics
Laser Physics

Background:

Optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
Synchronously pumped OPOs offer precise temporal control of output pulses.
Zinc Germanium Phosphide (ZGP) is a nonlinear crystal suitable for mid-infrared applications.

Purpose of the Study:

To experimentally demonstrate a picosecond, singly resonant, synchronously pumped optical parametric oscillator (SPOPO) utilizing a ZGP crystal.
To investigate the tuning characteristics and output power of the ZGP SPOPO system.
To explore the potential of cascaded SPOPOs for generating mid-infrared radiation.

Main Methods:

The ZGP SPOPO was pumped using idler radiation from a periodically poled lithium niobate (PPLN) SPOPO.

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Noncritical 90-degree phase matching was employed in the ZGP crystal.

The pump wavelength was tuned from 2.25 to 2.5 micrometers to achieve wavelength tuning.

Output power and spectral characteristics were measured.

Main Results:

The ZGP SPOPO operated with picosecond pulse durations (approximately 8 ps) at a 76 MHz repetition rate.
The device was successfully tuned across the 3.8-5.6 micrometer wavelength range.
An average output power of approximately 800 mW was achieved at 4 micrometers.
Stable and continuous picosecond pulse train generation was confirmed.

Conclusions:

The experimental operation of a picosecond ZGP SPOPO was successfully demonstrated.
The ZGP SPOPO provides efficient and tunable mid-infrared radiation generation.
This technology holds promise for various spectroscopic and sensing applications in the mid-infrared spectrum.