Optical parametric oscillators with pumping by femtosecond pulses for broadband lidar gas analysis of atmosphere
2006
The middle IR or so-called "fingerprint" region of atmospheric gases is most attractive for multicomponent remote gas
analysis of the atmosphere. Femtosecond lidars can be applied to this purpose. In recent years compact powerful laser
systems have been developed, which emit the pulses of femtosecond duration. First of all, those are solid-state lasers
based on wide-band active media: Ti 3+ :Al 2 0 3 (λ = 0.75-1 μm) and Cr 3+ :MgSiO 4 (1.2-1.32 μm). Frequency conversion of
these quite promising and basic sources of super-short pulses into other spectral ranges using non-centrosymmetrical
nonlinear crystals seems to be quite attractive, especially if preserving duration of the transformed radiation. Usually to
overcome the problem middle IR femtosecond pulses are generating with two- or three-stage low efficiency frequency
converters with nonlinear crystals. High efficiency middle IR semiconductor crystals are not suitable for one-stage
generation because high optical loss at near IR.
This study was aimed at search and investigation of nonlinear crystals, in which effective single-stage optical parametric
oscillators. The investigation includes estimation of phase- and group-velocity matching conditions, phase-matching
spectral and angular widths, and potential efficiencies. The possibilities of using a hyper broadband nonlinear-optical
frequency converter of femtosecond pulse radiation for design of multicomponent mixture analyzers are investigated.
The method of broadband lidar sensing of atmospheric gases by the DOAS-technique (Differential Optical Absorption
Spectroscopy) is described. The numerical simulation of DOAS sensing of atmospheric gas components using the
frequency-converted femtosecond radiation is carried out.
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