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Beam modification during propagation through aqueous microalgae suspension of interest to waveguidingстатья
- Авторы: Kovačević Aleksander, Pajić Tanja, Jovanović Djordje, Stanić Marina, Pavlović Danica, Fedotova Olga, Khasanov Oleg, Rusetski Rygor, Lekić Marina, Salatić Branislav, Jelenković Branislav
- Сборник: 16 th Photonics Workshop
- Серия: 12
- Том: 3
- Год издания: 2023
- Первая страница: 53
- Аннотация: Chlorella sorokiniana, due to its highest resistivity to heat and high light intensity among all Chlorella species, is a good candidate in the applications of light generation, waveguiding and modulation. Relative refractive index with respect to water is makes the cells the positive polarizability particles and lowest absorption in the green region of the visible spectrum reduces the thermal effects generated from the propagating high power laser beam.During laser beam propagation through aqueous suspensions of metal nanoparticles or microscopic marine bacteria, nonlinear effects, like thermo-optical, scattering, optical gradient forces take place in shaping the beam. However, strong thermal absorption of metal and sensitivity to strong light of cells limit the range of beam power. We examined the propagation of the 532 nm CW laser beam of various powers through the suspension of freshwater green microalga C. sorokiniana of various concentrations, placed in a glass vessel. For two concentrations of algae (0.5× 107 cm-3 and 1× 107 cm-3) and several selected values of beam power (2-4 W) the beam experiences self-guiding and changes in exit cross section. In this work, we pay attention to broader range of powers (0.1-5 W) and concentrations and investigate the diameter change during propagation and the cross-section change at exit wall of the vessel due to nonlinear effects, which might be interesting for waveguiding and optimal laser propagation in biological suspensions.
- Добавил в систему: Федотова Ольга Михайловна