Antoine Berrou

Compact, single-frequency, doubly resonant optical parametric oscillator pumped in an achromatic phase-adapted double-pass geometry.

We report on a nested-cavity, doubly resonant optical parametric oscillator (NesCOPO) architecture for widely tunable, mid-IR, single-frequency generation. By use of an achromatic phase-adapted double-pass pumping scheme, this new, low-threshold, semimonolithic architecture only requires two free-standing cavity mirrors and a nonlinear crystal with a mirror coating deposited on its input facet while the other facet is antireflection coated. It is thus as simple and compact as any basic linear optical parametric oscillator cavity, is easily tunable, and displays low sensitivity to mechanical vibrations. Using a high-repetition-rate (4.8 kHz) microlaser as the pump source of the NesCOPO, we demonstrate a compact source that provides pulsed, stable single-frequency output over a wide spectral range (3.8-4.3 μm) with a high peak power (up to 50 W), which are properties well suited for practical gas sensing applications.

Mid-IR Entangled-Cavity Doubly Resonant OPO pumped by a micro-laser

By pumping a mid infrared entangled cavity doubly resonant optical parametric oscillator with a micro-laser, we demonstrate the full potentialities of this widely tunable source : high spectral purity, compactness and low threshold of oscillation.

Fine frequency tuning and ±3 MHz frequency stabilisation of a nanosecond mid-infrared doubly resonant optical parametric oscillator

We demonstrate 100 GHz continuous tuning and plusmn3 MHz frequency stabilization of the signal radiation delivered by an entangled cavity nanosecond OPO while the frequency fluctuation of the pump radiation is larger than 500 MHz.

Mid-IR entangled-cavity doubly resonant OPO with back-conversion minimization and automated tuning

Entangled cavity optical parametric oscillators are known as powerful devices to fulfill requirements for high resolution spectroscopy. We demonstrate here that output performances can be strongly improved by using a partial pump beam reflection.

Achromatic double-pass configuration in a single longitudinal mode doubly resonant OPO

We present a new, low threshold, narrow linewidth, entangled cavity scheme for nanosecond OPO. Thanks to this compact design, open loop single longitudinal mode operation is achieved over hours with 5 MHz short term stability.

High Brightness 2 µm Source Based on A Type II Doubly Resonant ECOPO

For CO2 DIAL, the single mode output of a type II PPLN, entangled-cavity nanosecond OPO is amplified to 11 mJ at 2.05 µm, with 3MHz frequency stability and a M2quality factor better than 1.9.

Mid-IR photoacoustic spectroscopy by use of an entangled-cavity doubly resonant OPO

An entangled cavity optical parametric oscillator is applied for photoacoustic spectroscopy in the wavelength range of 3.8-4.3 mum. High resolution spectra of N2O are reported around 3.8 and 4 mum.

Single longitudinal mode, 3 MHz frequency stable, 11mJ, type II doubly resonant OPO/OPA for CO 2 DIAL

For CO 2 differential-absorption LIDAR, the single-mode output of a type-II PPLN entangled-cavity nanosecond doubly-resonant OPO emitting at 2.05 µm is amplified to 11 mJ, with 3 MHz rms frequency stability and a M2 ≪ 1.9.

Double-Pass Single Mode ECOPO with Achromatic Phase-Adaptation

We report on a new ECOPO architecture for nanosecond OPO with low oscillation threshold and narrow linewidth. We demonstrate open loop single longitudinal mode operation over several hours with short term stability of 5 MHz.

Fine Frequency Tuning and ±3 MHz Frequency Stabilisation of a Nanosecond Mid-Infrared Doubly Resonant Optical Parametric Oscillator

We demonstrate 100 GHz continuous tuning and plusmn3 MHz frequency stabilization of the signal radiation delivered by an entangled cavity nanosecond OPO while the frequency fluctuation of the pump radiation is larger than 500 MHz.