<title>Two-frequency IR cw LFM lidar for remote sensing of hydrocarbons and gas vapor</title>

Abstract

The problems of working out the IR-CW-LFM-lidar with transformation of one frequency laser radiation into two frequency and tuning probability are considered. Comparative analysis results for characteristics of two frequency laser radiators put into differential IR-CW-LFM-lidars are given. The perspectivity for amplitude-phase electrooptical devices developmeni is shown. Their scheme decisions are considered. Theoretical and experimental investigation results of transformation parameters effect on purity of radiator output spectrum, as the main function, which determines the metrological characteristics of IR-CW-LFM-lidar on the whole are presented. The possibilities of IR-CW-LFM-lidars with frequency transformation realizing different ways of gas remote sensing are estimated. The experimental setup's structural scheme is presented.

Universal Microwave Photonics Approach to Frequency-Coded Quantum Key Distribution

“…The operation of AMPC-PCAM QKD system with frequency encoding is based on amplitudephase modulation conversion of the photon carrier realized with the procedures described by Il'in-Morozov's method and its implementations on one or two modulators [29,30]. Variants of constructive AM interference are shown in Figure 13 in the case of constructive PC on Alice and Bob sides.…”

Poly-harmonic Analysis of Raman and Mandelstam-Brillouin Scatterings and Bragg Reflection Spectra

“…One of possible ways to decide specified problems of FBG reflection spectra characterization is based on FBG probing by the two-frequency radiation which average frequency at calibration point is adjusted on the central wavelength of FGB spectrum, and its detune and-or amplitudes difference between components are used as informative factors for definition of enclosed physical field parameter [4,41]. The two-frequency measurement technique finds more and more appendices in various problems, for example: research of atmospheric gases absorption contours [42,43], measurement of dielectric coverings thickness [44], the analysis of FBG spectrum contour [45], an estimation of communication lines selective devices temperature drift [46], etc. Distinctions consist in parameters of used two-frequency signal or radiation, the requirements shown to their stability and techniques of measuring transformation.…”