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6607519 
Journal Article 
Spectroscopic investigations of polymer phototropic media, used for controlling laser radiation 
Eremeeva, EP; Ovchinnikov, VM; Arkhipov, VP; Ivanova, TF; Piterkin, BD; Smirnova, ZA 
1984 
Yes 
Journal of Applied Spectroscopy
ISSN: 0021-9037
EISSN: 1573-8647 
40 
4 
384-389 
INSPEC:2485668 
Phototropic media based on polymethine dyes (PD) are widely used in quantum electronics to make devices for controlling 1,06-mum radiation; these devices permit changing the spacetime and spectral characteristics of laser systems. During use, these devices are subjected to the action of intense light fluxes and sometimes to ionising radiation as well. This changes the physicochemical characteristics of the phototropic media, which is the factor responsible for the operational instability of laser systems as a whole. An important problem in this connection is the comprehensive study of the degradation of phototropic media in intense light fluxes and under the action of ionising radiation for the purpose of creating highly efficient and reliable devices for controlling laser radiation. The authors investigated by spectrometry and radiofrequency spectrometry (EPR) the changes induced in the physicochemical characteristics of polymers as well as PPM based on PD with an absorption band in the region 1.0-1.03 mum by the following types of radiation: coherent-resonant (lambda-1.06 mum) and nonresonant (lambda=0,694 mum) and incoherent ionising ultraviolet (UV) and gamma radiation from Co60. The objects of the investigation were specimens of polystyrene (PS), polymethyl methacrylate (PMMA), copolymers of methyl methacrylate (MMA) and butylacrylate (BA), MMA and styrene (ST) as well as PPM based on PMMA films (40-70 mum thick) and PD 3955, 4203, 5736, and 2681u.