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

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 ...

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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 Ti:Sapphire femtosecond laser amplifier as the excitation source can generate nJ-level THz pulses, but the pump source is bulky and very expensive; using a high-average-power fiber femtosecond laser as the excitation source can generate pJ ultrafast THz radiation pulses, but the overall efficiency of the system remains low

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