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AlGaAs/GaAs room-temperature pulse-operating mid-infrared (λ∼9.5μm) quantum-cascade lasers (QCLs) have been developed for application in gas detection systems. The 1046.4cm−1 spectral line selected from the multimode laser spectrum was used for the ammonia detection with resolution at ppb level.
In the paper the steering possibility of nonlinear light beam in chiral nematics film are presented. We measured the propagation of light beam at the distance of few millimeters and the nonlinear self-focusing was observed for a light power of order of few tenths of milliwatts. Additional, in a waveguide induced by the nematicon, other low-power light beam (signal beam) with different wavelength was...
We demonstrate experimentally the existence of spatial solitons in a chiral nematic liquid crystal planar cell. Due to the optical reorientational nonlinearity there were created for a light power of a few milliwatts. The low absorption allows us to observe soliton propagation distance over lengths of a few millimeters.
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