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Optical rectification is one of the most widely used methods to generate broadband terahertz (THz) radiation using femtosecond laser pulses. In this work, we report the generation of THz radiation from GaP crystals based on optical rectification using a pulsed Bessel beam, i.e., a beam with a spatial profile described by a zeroth-order Bessel function of the first kind. It is shown that the nondiffracting...
Terahertz wave generation based on optical rectification in GaP waveguide emitters with a femtosecond zeroth-order Bessel beam was reported. The non-diffracting nature of the Bessel beam enabled an enhancement of the THz output power by factors of 3.46 and 3.34 from GaP waveguides of 6 and 10 mm, respectively, compared with a Gaussian beam having the same beam size and pump power as the central spot...
We investigate experimentally two counter-propagating beams that travel through multimode fibers with strong mode coupling. The interferences between waves going through time-reversed paths can enhance, and surprisingly sometimes suppress, coherent backscattering to the input mode.
We demonstrate a novel mechanism for controlling absorption of coherent light bytwo orders of magnitude. By varying the phase of incident laser light in a two-port geometry, the absorption is greatly enhanced or reduced.
An arbitrary body or aggregate can be made perfectly absorbing at discrete frequencies, if a precise amount of dissipation is added under specific conditions of coherent monochromatic illumination. This effect arises from the interaction of optical absorption and wave interference, and corresponds to moving a zero of the S-matrix onto the real wavevector axis. It is thus the time-reversed process...
Lasing was realized a sub-micron GaAs disk, which was fabricated by standard optical lithography and wet-etching method. As the disk thickness is comparable to the disk radius, 3D-FDTD was used to simulate the resonant modes.
In this talk, we demonstrate that the lasing threshold in a semiconductor microstadium can be minimized by tuning its shape. Contrary to common expectation, modes of such a completely open fully chaotic microcavity may have long lifetime. As the dielectric microstadium represents a completely open fully chaotic cavity, this work opens the door to control chaotic microcavity lasers by tailoring its...
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