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Nonlinear spectral phase measuring method

A technology of phase measurement and measurement method, applied in the field of nonlinear spectral phase measurement, can solve problems such as wasting time, and achieve the effects of improving accuracy, simple and fast data processing, and reducing errors

Inactive Publication Date: 2017-05-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This not only wastes time, but also adds a lot of variables to the experiment

Method used

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Embodiment 1

[0038] This method proposes a new phase-sensitive nonlinear spectral measurement method, which mainly includes two parts: spectral acquisition and data processing. The schematic diagram of the optical path of the instrument is as follows: figure 1 shown.

[0039] This method is suitable for the measurement of all nonlinear optical spectra, such as: frequency doubling spectrum, sum frequency spectrum and four-wave mixing, etc., and different input pump sources are selected according to different nonlinear conditions. Use the first CCD-type spectrometer 8 and the second CCD-type spectrometer 9 to complete spectrum collection.

[0040] Wherein, the first CCD-type spectrometer 8 is used to collect the sum of the nonlinear spectral signals of the sample to be tested 1 and the reference crystal 6; the second CCD-type spectrometer 9 is used to collect the nonlinear spectrum of the sample to be tested 1 with half-wave loss signal, and the sum of the nonlinear spectral signal of the ...

Embodiment 2

[0044] Combine below figure 1 and figure 2 , and mathematical formulas, the scheme in embodiment 1 is further introduced, the embodiment of the present invention proposes a new phase-sensitive nonlinear spectral measurement method, which can be divided into two parts, spectrum acquisition and data processing, the embodiment of the present invention Taking the detection of the sum-frequency spectrum as an example, the implementation method is described in detail below:

[0045] The hardware structure of the spectrum acquisition part is as follows: figure 1 shown. First, the infrared ultrashort pulse laser and the visible light ultrashort pulse laser are used as the input pump source 1, and are input in a collinear manner.

[0046] The input pumping source 1 is divided into two beams through the first beam splitter 2, and simultaneously irradiates on the reference crystal 6 (for example: it can be a quartz crystal, which is not limited in the embodiment of the present inventio...

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Abstract

The invention discloses a nonlinear spectral phase measuring method and relates to the technical field of nonlinear spectral detection. The nonlinear spectral phase measuring method is applicable to the measurement of all nonlinear optical spectra, such as doubled-frequency spectrum, sum-frequency spectrum and four-wave mixing spectrum; different pumped sources are selected for collinear input according to different nonlinearity conditions. Two CCD (charge coupled device) spectrographs are used respectively to detect a sum of nonlinear signals from sample under test and reference crystal, and a sum of a nonlinear signal of a sample under test, having half-wave loss, and a nonlinear signal of the reference crystal; the acquired spectral signals are subjected to simple data processing to obtain amplitude and phase information of the nonlinear spectrum of the sample under test; the nonlinear spectral phase measuring method is an efficient accurate nonlinear spectral information acquisition means, having a promising prospect in nonlinear spectrum studies.

Description

technical field [0001] The invention relates to the technical field of nonlinear spectrum detection, in particular to a nonlinear spectrum phase measurement method. Background technique [0002] Nonlinear optics is used to study the phenomenon of a series of nonlinear changes produced by substances under strong light irradiation. Only when the laser has a sufficient intensity can the material produce nonlinear optical effects. [0003] In the 1960s, nonlinear optics got an early stage of development. At this stage, the second harmonic generation (frequency doubling), difference frequency, sum frequency, stimulated Brillouin scattering, stimulated Raman Scattering, two-photon absorption, saturable absorption, optical parametric oscillator and other nonlinear optical phenomena are observed and studied. [0004] In the 1970s, nonlinear optics continued to develop in depth. Researchers successively discovered a variety of important nonlinear optical effects, and carried out sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28
CPCG01J3/2803
Inventor 马翔云王洋王慧捷杜建宾陈达李奇峰
Owner TIANJIN UNIV
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