Double-pass single mode ECOPO with achromatic phase-adaptation

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

doi:10.1364/assp.2009.mb21

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(2 citation statements)

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“…Such short term, shot by shot, stability performance could be improved using better mechanical design and better piezo-electric transducers, but is already compatible with high accuracy LIDAR measurements. Yet the device could still be improved : to prevent mode hops behaviour of the device after a few minutes, due to pump and mechanical instabilities, a shorter cavity, mechanically more stable, could be implemented [18] : mode hop-free, free running long term stability (over hours) can thus be expected. …”

Section: Laser Transmitter Architecture and Performancesmentioning

confidence: 99%

“…After better optimization of the interacting waves temporal (delay line) and spatial mode matching and beam divergences inside the non linear amplifier crystals, use of a higher energy pump source can be combined with the increase of beam sizes inside the KTP stages [7] ; another way to suppress this detrimental walk-off effect would be to implement high aperture PPLN crystals [6] . Next steps will now be dedicated to the implementation of a shorter cavity for the ECOPO, in order to achieve mode-hop-free, free running long term stability (over hours) as we recently demonstrated with a new ECOPO [18] . Efforts are also made towards miniaturization of the device, in order to improve the mechanical robustness and stability ( Figure 9).…”

Section: System Optimisation and Perspectivesmentioning

confidence: 99%

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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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Section: Laser Transmitter Architecture and Performancesmentioning

confidence: 99%