The Experts below are selected from a list of 132 Experts worldwide ranked by ideXlab platform

B. Lundin - One of the best experts on this subject based on the ideXlab platform.

  • ACTIVE SPACE EXPERIMENTS WITH ELECTRON BEAM INJECTION : WHISTLER Wave EMISSION AND COMPATIBLE ON-BOARD VLF RECEIVER
    Europhysics Letters (EPL), 1995
    Co-Authors: C. Krafft, B. Lundin
    Abstract:

    The compatibility of the spectral characteristics of VLF receivers with the peculiarities of the electromagnetic emissions radiated by electron beams artificially injected into the ionospheric plasma during active space experiments is discussed. It is shown that the signal amplitude at the output of a narrow frequency filter on board the remote receiver essentially depends on the ratio of the frequency width of the filter to the intrinsic frequency width of the whistler signal connected with the ray representation of the Emitted Wave field. The results of our study can also be used to choose the appropriate parameters of an ulterior spectral analysis of the wide-band receiver records to obtain clearly interpretable spectral data.

C. Lei - One of the best experts on this subject based on the ideXlab platform.

  • Spontaneous emission and optical gain in a Fabry–Perot microcavity
    Applied Physics Letters, 1992
    Co-Authors: Dennis G. Deppe, C. Lei
    Abstract:

    The Fabry–Perot microcavity is analyzed in terms of its modification of the spontaneous emission and stimulated emission from a thin gain medium, which is contained between distributed Bragg reflectors. The structures correspond to the vertical‐cavity surface‐emitting semiconductor laser. Gain enhancement due to the cavity is calculated and compared to the case of a large Fabry–Perot cavity. The critical parameters in determining the degree of gain enhancement are the (large cavity) coherence length of the spontaneously Emitted Wave packet, and reflector design.

Hiromasa Ito - One of the best experts on this subject based on the ideXlab platform.

  • thz Wave surface Emitted difference frequency generation in nonlinear materials
    Applied and Environmental Microbiology, 2000
    Co-Authors: Yuri Avetisyan, Kodo Kawase, Hiromasa Ito
    Abstract:

    Summary form only given. The nonlinear difference-frequency mixing between two laser sources is widely used method of coherent THz-Wave generation. Unfortunately many nonlinear materials have a large absorption in THz region. To overcoming this problem we offer to realize difference frequency generation (DFG) in surface emitting geometry (SEG). In contrast to collinear geometry, the thickness of nonlinear optical Waveguide, which is usually much less than its length determine the absorption of Emitted Wave in SEG. The additional advantage of SEG is a significant increase of generation efficiency due to the possibility of application of resonant cavities both at a pumping and at a difference frequency. The SEG allows the separate optimization of both optical and THz cavities. We have proposed a new simple method of THz-Wave generation in the strongly absorbing material based on the surface-Emitted DFG.

C. Krafft - One of the best experts on this subject based on the ideXlab platform.

  • ACTIVE SPACE EXPERIMENTS WITH ELECTRON BEAM INJECTION : WHISTLER Wave EMISSION AND COMPATIBLE ON-BOARD VLF RECEIVER
    Europhysics Letters (EPL), 1995
    Co-Authors: C. Krafft, B. Lundin
    Abstract:

    The compatibility of the spectral characteristics of VLF receivers with the peculiarities of the electromagnetic emissions radiated by electron beams artificially injected into the ionospheric plasma during active space experiments is discussed. It is shown that the signal amplitude at the output of a narrow frequency filter on board the remote receiver essentially depends on the ratio of the frequency width of the filter to the intrinsic frequency width of the whistler signal connected with the ray representation of the Emitted Wave field. The results of our study can also be used to choose the appropriate parameters of an ulterior spectral analysis of the wide-band receiver records to obtain clearly interpretable spectral data.

Dennis G. Deppe - One of the best experts on this subject based on the ideXlab platform.

  • Spontaneous emission and optical gain in a Fabry–Perot microcavity
    Applied Physics Letters, 1992
    Co-Authors: Dennis G. Deppe, C. Lei
    Abstract:

    The Fabry–Perot microcavity is analyzed in terms of its modification of the spontaneous emission and stimulated emission from a thin gain medium, which is contained between distributed Bragg reflectors. The structures correspond to the vertical‐cavity surface‐emitting semiconductor laser. Gain enhancement due to the cavity is calculated and compared to the case of a large Fabry–Perot cavity. The critical parameters in determining the degree of gain enhancement are the (large cavity) coherence length of the spontaneously Emitted Wave packet, and reflector design.