In this work we investigated the possibility of generating subpicosecond pulses as a result of a modulation instability of continuous wave signals with a large modulation depth. In our case a large modulation depth of a continuous wave is achieved by using a cylindrical waveguides with a running refractive index wave (RRIW). Here, the entire cascade fiber system is a cylindrical waveguides RRIW connected in series with a section of passive fiber with anomalous dispersion. To achieve high peak power values in the generated pulse train, it is necessary to add a section of active fiber with normal dispersion to the stage. It is shown that, as a result of the regime of a induce modulation instability, pulses with a peak power that are orders of magnitude higher than the power of the incoming pump wave can be formed.
In this paper it was investigated the dynamics of frequency-modulated pulses in fiber cascades, consisting of a fibers with sequentially formed refractive index gratings with different periods. It is shown that the proposed scheme can be used to generate picosecond and subpicosecond pulses with peak powers of the order of ~1 MW. In the considered cascade structures, it is shown that it is possible to form stable sequences of pico- and subpicosecond pulses with a subterahertz repetition rate directly from continuous wave signals as a result of a modulation instability regime.
The effect of broad-range (10 nm) self-sweeping near 2100 nm in Ho-doped fiber laser has been demonstrated experimentally. The narrowband linearly-polarized tunable radiation with average output power of more than 200 mW is obtained. The use of highly-doped holmium fiber allowed to obtain the widest sweeping range. The polarization maintaining elements and temperature stabilization of the active fiber were applied to stabilize the laser operation. The developed source can be used for spectroscopy of Nitrous oxide, having absorption lines in that spectral region.
The possibilities of using plasma formed by laser radiation in Ge- and Si semiconductors to create plasma antennas are analyzed. The dependences of the amplitude of the emitted microwave signal in the range of 6-7.5 GHz on the laser power and the length of the irradiated section on the semiconductor plate, which served as a transmitting vibrating antenna, were obtained. It is shown that the amplitude of the transmitted signal during the formation of a plasma antenna in Si and Ge crystals can be increased by more than an order of magnitude. The proposed method for creating a semiconductor plasma antenna with initiation by laser radiation has great prospects for creating materials with controlled electromagnetic characteristics in the radio, microwave and THz spectral ranges.
Multiwavelength lasing in the random distributed feedback fiber laser is demonstrated by employing an all fiber Lyot filter. Stable multiwavelength generation is obtained, with each line exhibiting sub-nanometer line-widths. A flat power distribution over multiple lines is also obtained, which indicates the contribution of nonlinear wave mixing towards power redistribution and equalization in the system. The multiwavelength generation is observed simultaneously in first and second Stokes waves.
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