Quasi-phase-matching higher harmonic device based on ultrasonic modulation

A quasi-phase matching and high-order harmonic technology, which is applied in nonlinear optics, instruments, optics, etc., can solve the problems of high operating cost, limited interaction area between laser and gas, and inability to generate high-intensity harmonic radiation, etc., to achieve The effect of large adjustable range and simple operation

Inactive Publication Date: 2009-08-26
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Its shortcoming is that the shortest distance between two nickel tubes is only 0.4mm, which makes it difficult to produce harmonic radiation in a shorter band, and there are only two nickel tubes, and the laser and gas interaction area is limit

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  • Quasi-phase-matching higher harmonic device based on ultrasonic modulation

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Embodiment Construction

[0016] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0017] Such as figure 1 As shown, this embodiment includes: femtosecond laser 1, focusing lens 2, ultrasonic transducer 3, strip nozzle 4, metal film 5, X-ray spectrometer 6, computer 7, vacuum chamber 8, decompression gas valve 9 , Control panel 10. On the output optical path of the laser 1, there are focusing lens 2, ultrasonic transducer 3, He gas (sprayed by strip nozzle 3), metal film 5, and X-ray spectrometer 6, wherein ultrasonic transducer 3, strip-shaped The nozzle 4, the metal film 5, and the X-ray spectrometer 6 are all placed in a vacuum chamber 8. The u...

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Abstract

The invention relates to a quasi-phase-matching higher harmonic device based on ultrasonic modulation in the laser technical field, which comprises a femto-second laser, a focusing lens, an ultrasonic transducer, a bar type nozzle, a metallic film, an X ray spectrometer, a computer, a vacuum chamber, a decompression gas valve and a control panel. The output light path of the femto-second laser is sequentially provided with the focusing lens, the ultrasonic transducer, inert gases, the metallic film and the X ray spectrometer. Lasers emitted by the femto-second laser is focused below the bar type nozzle by the lens and interact with the inert gases with density periodic variation which is spouted by the nozzle and modulated by an ultrasonic field to radiate higher harmonics which are reflected into the X ray spectrometer after being filtered by the metallic film and then are sent into the computer. The device meets the quasi-phase-matching condition of the higher harmonics by using ultrasonic modulation gas density, is convenient to be operated and simple and easy, can propel the coherent light source of the higher harmonics soft X ray to shorter waver.

Description

technical field [0001] The invention relates to a device in the field of laser technology, in particular to a quasi-phase-matching high-order harmonic device based on ultrasonic modulation. Background technique [0002] Due to its important application value in lithography, high-resolution imaging, and microscopic imaging of biological living cells, coherent light sources in the soft X-ray band have become a frontier topic in laser science research in recent years. Using the interaction of ultrafast strong laser field and noble gas to generate High Harmonic Generation (HHG) is a main method to obtain coherent soft X-rays. However, due to the phase mismatch between the fundamental wave and the harmonic wave during transmission, the conversion efficiency of HHG is quite low, only 10 -11 , seriously restricting the application of HHG. Although there are currently some technologies that can push high-order harmonics to the extreme ultraviolet region and improve the conversion ...

Claims

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Application Information

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IPC IPC(8): G02F1/35
Inventor 郑莉陈险峰路明唐嵩松
Owner SHANGHAI JIAO TONG UNIV
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