Pumping optical multiplexing high-efficiency generating high power THz radiation pulse source

A technology of terahertz radiation and pump light, applied in the field of terahertz radiation technology, can solve the problems of bulky pump source, limited popularization and application, and low overall efficiency, and achieve simple overall structure, improved conversion efficiency, and low operating costs Effect

Inactive Publication Date: 2009-04-15
TIANJIN UNIV
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Problems solved by technology

Although free electron lasers can generate ultrafast THz radiation pulses of 10-100 μJ, their bulky size greatly limits their popularization and application; high-power femtosecond lasers are used to excite large-aperture photoconductive switches, and the center frequency of the radiation is only at At 0.5THz; using a...

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  • Pumping optical multiplexing high-efficiency generating high power THz radiation pulse source
  • Pumping optical multiplexing high-efficiency generating high power THz radiation pulse source
  • Pumping optical multiplexing high-efficiency generating high power THz radiation pulse source

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] Photonic crystal fiber femtosecond laser amplifiers, such as figure 1 As shown in component 1, the working wavelength is 1.04μm, the pulse repetition rate is greater than 50MH, the average output power is greater than 10W, and the pulse width is 100fs. The original photonic crystal fiber femtosecond laser amplifier is used to reciprocate the two-pass method of the dispersion compensation grating pair, and is transformed into a one-pass method. The grating with 600-1200 lines / mm is used, and the distance between the two gratings is 2-4cm. Properly adjust the spacing of the grating pair so that the beam from the photonic crystal fiber femtosecond laser amplifier without dispersion compensation passes through the grating pair once. In addition to compensating the dispersion of the carried amplifier, the beam is expanded and the pulse wavefront is tilted at the s...

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Abstract

The invention discloses a high-power terahertz radiation pulse source which is efficiently generated by the multiplexing of pump light. The high-power terahertz radiation pulse source which is efficiently generated by the multiplexing of pump light comprises a photonic crystal fiber femtosecond laser amplifier, a beam pulse wave surface tiltometer and a dual-purpose dispersion compensator, a multiplexing cavity length matching control system, a pump light multiplexing cavity, a multiplexing cavity length adjustor and a terahertz radiation pulse emitter. The invention has the advantages that the photonic crystal fiber femtosecond laser amplifier is adopted; by using a multipass cavity structure and a grating for dispersion compensation and a beam pulse wave surface tilt method, the pump light utilization rate is improved; the theory limit that the efficiency of the pump light converted into THz radiation is extremely low is overcome, and the high-power running is realized; in addition, the invention has simple whole structure, good stability and low running cost.

Description

technical field [0001] The invention relates to a high-power terahertz radiation pulse source for efficiently generating high-power terahertz radiation by multiplexing pump light, which belongs to the terahertz (THz) radiation technology. Background technique [0002] Terahertz wave (also known as THz wave) refers to the spectrum range of 0.1-10THz (1THz=10 12 Hz) electromagnetic waves. As early as the 1920s, scientists drew attention to THz waves. Historically, THz waves have only been known in the field of astronomy (used to detect the radiation background of the Big Bang) and in laser plasma diagnostics. In 1981, the birth of the femtosecond laser provided an ideal pump source for the generation of THz radiation pulses; then the THz time-domain spectrum technology (THz-TDS) based on the femtosecond laser was invented. The technology can simultaneously detect the phase and amplitude information of electromagnetic waves. The advent of THz radiation pulses has shown the ...

Claims

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Application Information

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IPC IPC(8): G02F1/35H01S3/063G02B23/02
Inventor 邢岐荣刘丰王昌雷栗岩峰田震王月宾
Owner TIANJIN UNIV
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