15 March 2004 Laser-limiting materials for medical use
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Proceedings Volume 5261, Smart Medical and Biomedical Sensor Technology; (2004) https://doi.org/10.1117/12.521641
Event: Optical Technologies for Industrial, Environmental, and Biological Sensing, 2003, Providence, RI, United States
The important problem of modern laser medicine is the decrease of an exposure of biological tissues outside of an operational field and can be solved by optical radiation limiting. Organic dyes with reversibly darkening can be placed onto surfaces of irradiated tissues or can be introduced in solder for laser welding of vessels. The limiting properties of a set of nontoxic organic compounds were investigated. Nonlinear optical properties of dyes having reverse saturable absorption (pyran styryl derivatives, cyanine and porphyrine compounds) were studied under XeCl and YAG:Nd (II harmonics) lasers excitation. The effect of attenuation of a visible laser radiation is obtained for ethanol solutions of cyanines: radiation attenuation coefficient ( AC) = 25-35 at N/S = 100-250 MW/cm2. In water solutions of such compounds in UV spectrum range AC ≈ 10. The spectral characteristics of compounds appeared expedient enough to operational use in laser limiters (broad passband in visible range of a spectrum). Under the data of Z-scanning (the scheme F/10) value AC ≈ 70 was reached. The limiting of power laser radiation in visible (λ = 532 nm) and UV- (λ = 308 nm) spectral region and nanosecond pulse duration (7 -13 ns) across porphyrine solutions and their complexes with some metals (13 compounds) was investigated too. The comparative study of optical limiting dependence on intensity of laser radiation, solvent type and concentration of solutions was carried out for selecte wavelength. There was shown a possible use of pyran styryl derivatives DCM as limiters of visual laser radiation. To understand a mechanism of laser radiation limitation the light induced processes were experimentally and theoretically studied in organic molecules. The quantum-chemical investigation of one cyanine compound was carried out. There were noted the perspectives of laser radiation limiting by application of inverted schemes of traditional laser shutters. Usage of phenomena of light -induced opalescence in one-component liquids and spinodal decay in stratifying liquid solutions is proposed.
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Vitaly M. Podgaetsky, Vitaly M. Podgaetsky, Tat'yana N. Kopylova, Tat'yana N. Kopylova, Sergey A. Tereshchenko, Sergey A. Tereshchenko, Alexander V. Reznichenko, Alexander V. Reznichenko, Sergey V. Selishchev, Sergey V. Selishchev, } "Laser-limiting materials for medical use", Proc. SPIE 5261, Smart Medical and Biomedical Sensor Technology, (15 March 2004); doi: 10.1117/12.521641; https://doi.org/10.1117/12.521641

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