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THz radiation reinforcing method through light line array

A filament and array technology, applied in the field of high-field laser physics, can solve the problems of low photon conversion efficiency and limited THz application, and achieve the effect of enhancing THz radiation power, high THz light wave power, and good signal-to-noise ratio.

Active Publication Date: 2013-11-27
天津理特光电科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

The average power of THz waves currently generated is on the order of nanowatts to microwatts, and the photon conversion efficiency is extremely low, which greatly limits the practical application of THz

Method used

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  • THz radiation reinforcing method through light line array
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  • THz radiation reinforcing method through light line array

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Experimental program
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Effect test

Embodiment 1

[0033] figure 1 It is a schematic diagram of using a step-type phase plate to generate a controllable filament array to enhance THz radiation according to an embodiment of the present invention. In the embodiment of the present invention, an 800 nm femtosecond laser is used, the pulse width is about 50 fs, the repetition frequency is 1 kHz, and the beam radius is about 9 mm. After the femtosecond laser is collimated by the collimation diaphragm (not shown), it is divided into two beams by the high-reflection mirror 1. The stronger light is the pump light, and the weaker light is the probe light.

[0034] After passing through the delay device, the probe light is combined with the THz light wave at the thin-film polarization beam combiner 12 through two mirrors. The optical path of the probe light after beam combining is described below.

[0035] The pump light passes through the chopper 6, the plano-convex lens 7, and the BBO crystal 8 in sequence, and generates a light fil...

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Abstract

The invention relates to a THz radiation reinforcing method through a light line array, which comprises the following steps: calibrated femtosecond laser are focused by a focusing lens to generate light line; a BBO crystal is mounted behind the focusing lens to generate a two-color field; a step-type phase plate is mounted in front of the focusing lens to generate controllable light line array to reinforce the THz radiation. Compared with the conventional THz radiation reinforcing method, the method provided by the invention has the advantage that a simple, compact, and feasible structure is provided; the generated THz is impulse light wave, has higher average power and signal-to-noise ratio compared with THz generated without the phase plate, and can be applied to THz remote detection; the THz radiation reinforcing method can reinforce THz radiation power, increases the signal-to-noise ratio, and can be applied to THz spectral analysis.

Description

technical field [0001] The invention belongs to the field of strong-field laser physics, and relates to a method for enhancing Terahertz radiation (Terahertz Generation), in particular to enhancing THz radiation by generating an optical filament array. Background technique [0002] THz light generally refers to electromagnetic waves with a wavelength between 30 μm and 3 mm, and its working band is between electromagnetic waves and infrared rays. Due to the special position of the electromagnetic spectrum in which THz is located, it has many superior characteristics and has great scientific significance. Its superior characteristics are mainly manifested in the following aspects: First, the photon energy carried by THz light waves is low, only one millionth of that of X-rays, and does not generate ionizing radiation. It can perform repeated and non-destructive imaging on the human body or other objects Secondly, the vibration and pure rotation frequency of polar gas molecul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01V8/10
Inventor 刘伟伟郭兰军赵佳宇
Owner 天津理特光电科技有限公司
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