首页|Space-time light sheet with a controllable group velocity and reduced diffraction by combining multiple frequencies each carrying multiple Laguerre-Gaussian modes
Space-time light sheet with a controllable group velocity and reduced diffraction by combining multiple frequencies each carrying multiple Laguerre-Gaussian modes
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NSTL
Elsevier
We simulate space-time (ST) light sheet generation by combining multiple frequency comb lines, each carrying multiple Laguerre-Gaussian modes. Due to the correlation relationship between the spatial and temporal domain, the resulting ST light sheet has (a) a controllable group velocity and (b) reduced diffraction. We investigate the deviation of the group velocity from the designed value while varying the propagation distance and number of modes. The simulation results show that (i) the range of the propagation distance that the group velocity v(g) remains near the target value tends to decrease when v(g) deviates from the speed of light, (ii) when the maximum mode number increases, the simulated group velocity tends to be closer to the target value. In addition, we also characterize the reduced diffraction by the ratio of propagation distance over which the axial intensity is reduced by half (D-0.5I) with and without the spatial and temporal spectral correlation. Our results show that the ratio of the D-0.5I tends to (i) increase when the number of frequency lines increases, (ii) increase when the number of modes increases, and (iii) decrease when the target group velocity v(g) approaches the speed of light.
NSTL
Elsevier
