1979
DOI: 10.1007/bf00608429
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Conversion of broad-band light in nonlinear crystals

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Cited by 3 publications
(4 citation statements)
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“…When a divergent beam of broadband IR radiation propagates through a nonlinear optical crystal in the phase matching direction, the second harmonic of one of the input frequencies and sum frequencies is generated [14][15][16][17]. The phase matching conditions under nonlinear optical interaction are determined by the dependence of refractive indices on the R ratio in LiNbO 3 crystal.…”
Section: Resultsmentioning
confidence: 99%
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“…When a divergent beam of broadband IR radiation propagates through a nonlinear optical crystal in the phase matching direction, the second harmonic of one of the input frequencies and sum frequencies is generated [14][15][16][17]. The phase matching conditions under nonlinear optical interaction are determined by the dependence of refractive indices on the R ratio in LiNbO 3 crystal.…”
Section: Resultsmentioning
confidence: 99%
“…The width of the converted radiation spectrum depends to a great extent on the type of crystal used, its thickness, type of interaction (phase matching), and the position of the phase matching frequency in the spectrum of broadband IR radiation [14][15][16][17][18]. Con verted radiation has a maximum spectral width when the 90° phase matching frequency (ω 0 ) is chosen exactly in the middle of the frequency range of the incident IR radiation.…”
Section: Resultsmentioning
confidence: 99%
“…First, the conversion of broadband infrared radiation in nonlinear crystals was carried out by using narrowband laser pump radiation. However, this method for the visualization of infrared images has some disadvantages such as the spotty image structure caused by the coherence of laser pump radiation, distortion of the image size along one of the directions (in the plane of phase matching), narrow spectral frequency interval of the converted radiation of 20-30 cm −1 (occasionally, of 200-300 cm −1 ), and sharp deterioration of the converted image when the spectral frequency interval of the infrared radiation is increased or when the pump radiation is focused [6].…”
Section: Introductionmentioning
confidence: 99%
“…At the same time, there are a number of interesting experimental and theoretical results of studies of the conversion of broadband infrared radiation by the use of incoherent pump radiation. It has been shown that when certain conditions are fulfilled, the process of harmonic generation for incoherent pump radiation can be more effective than that for coherent laser pump radiation [6,7]. Then, nonlinear visualization of the infrared image of a thermal object by using pumping from nonlaser sources is the most reasonable method.…”
Section: Introductionmentioning
confidence: 99%