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

Hardy, B.; Guilbaud, Sylvain; Berrou, A.; Raybaut, Myriam; Godard, Antoine; Lefebvre, M.

doi:10.1364/cleo.2009.cwj3

Cited by 1 publication

(1 citation statement)

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“…Adequate dissociation of signal and idler cavities allows us to achieve a single coincidence of signal and idler modes under the parametric gain bandwidth. To induce a lower oscillation threshold and prevent back conversion of the signal and idler wave to the pump in the backward direction, mirror M3 is also used to double-pass the pump into the DROPO, and the relative phase of the three interacting waves is properly adjusted by translation of the wedged non linear crystal [13], [14], [15] . Using this ECOPO architecture, we fully benefit from the low oscillation threshold of the DROPO scheme and SLM operation can be intrinsically obtained at any wavelength achievable with a given non linear crystal, with a high frequency purity: side mode suppression ratio better than 30 dB have been demonstrated previously with similar devices [9] .…”

Section: Master Oscillator Principlementioning

confidence: 99%

A novel 2 μm, frequency conversion based, laser transmitter for CO 2 DIAL

et al. 2009

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We report on a novel 2 µm laser transmitter for CO 2 DIAL, based on a nanosecond parametric master oscillator-power amplifier architecture. The master oscillator is an entangled-cavity, doubly resonant, optical parametric oscillator, based on a type-II periodically poled Lithium Niobate nonlinear crystal. This device provides single-longitudinal-mode radiation, with a high frequency stability and high beam quality, with no need of an additional seeding source. The 2.05 µm signal emission is amplified by multi-stage parametric amplifiers to generate more than 10 mJ. After amplification, both the spectral purity and beam quality are maintained: we demonstrate single-longitudinal-mode emission with a frequency stability better than 3 MHz rms, within a nearly diffraction limited beam, with a M 2 quality factor close to 1.5. The unique performances of this parametric architecture make this device a relevant transmitter for CO 2 differentialabsorption LIDAR. Such approach could be readily duplicated for the detection of other greenhouse gases.

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