A band-stop angular filter(BSF)based on hump volume Bragg gratings(HVBGs)is proposed.Band-stop filtering in a two-stage amplifier laser system is discussed and simulated.Simulation results show that small-scale self-f...A band-stop angular filter(BSF)based on hump volume Bragg gratings(HVBGs)is proposed.Band-stop filtering in a two-stage amplifier laser system is discussed and simulated.Simulation results show that small-scale self-focusing effects in the laser system can be effectively suppressed with the BSF due to the control of fast nonlinear growth in a specific range of spatial frequencies in the laser beam.Near-field modulation of the output beam from the laser system was decreased from 2.69 to 1.37 by controlling the fast nonlinear growth of spatial frequencies ranging from 0.6 mm-1to 1.2 mm-1 with the BSF.In addition,the BSF can be used in a plug-and-play scheme and has potential applications in high-power laser systems.展开更多
A model describing the propagation of optical waves in a hologram volume grating is studied. Then the effects of the change in the average permittivity and conductivity of a grating on diffraction efficiency are discu...A model describing the propagation of optical waves in a hologram volume grating is studied. Then the effects of the change in the average permittivity and conductivity of a grating on diffraction efficiency are discussed. Finally a comparision of the results of this model with those by Solymar is made. The authors come to a conclusion that the effects of the change can be compensated.展开更多
基金supported by the National Key R&D Program of China(No.2016YFF0100903)the National Natural Science Foundation of China(NSFC)(Nos.61775153,61705153,and 11504255)+1 种基金the Natural Science Foundation of Jiangsu Province(No.BK20141232)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘A band-stop angular filter(BSF)based on hump volume Bragg gratings(HVBGs)is proposed.Band-stop filtering in a two-stage amplifier laser system is discussed and simulated.Simulation results show that small-scale self-focusing effects in the laser system can be effectively suppressed with the BSF due to the control of fast nonlinear growth in a specific range of spatial frequencies in the laser beam.Near-field modulation of the output beam from the laser system was decreased from 2.69 to 1.37 by controlling the fast nonlinear growth of spatial frequencies ranging from 0.6 mm-1to 1.2 mm-1 with the BSF.In addition,the BSF can be used in a plug-and-play scheme and has potential applications in high-power laser systems.
文摘A model describing the propagation of optical waves in a hologram volume grating is studied. Then the effects of the change in the average permittivity and conductivity of a grating on diffraction efficiency are discussed. Finally a comparision of the results of this model with those by Solymar is made. The authors come to a conclusion that the effects of the change can be compensated.
