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Method and device for ultrafast time discrimination measurement of seed photo-signal

A technology of time resolution and optical signal, which is applied in spectrum investigation and instrumentation, can solve the problems of high precision adjustment of optical system, time resolution of only sub-picoseconds, and low time resolution, so as to achieve convenient use and adjustment, and work The effect of wide frequency band range and high signal detection accuracy

Inactive Publication Date: 2008-09-24
PEKING UNIV
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Problems solved by technology

[0004] In order to solve the problem of low time resolution of traditional technologies, fluorescence ultrafast spectroscopy technologies such as "time-resolved fluorescence up-conversion technology (Fluorescence Up-Conversion)" and "optical Kerrgate technology (Optical KerrGate)" have been developed in recent years.
The former has the same time resolution capability as the femtosecond pulse width used, but requires high precision adjustment of the optical system, and the detection of the fluorescence spectrum is a single-wavelength detection, and the detection area is in the ultraviolet band; the latter uses organic solvents as the work medium with sub-picosecond time resolution
In addition, since these two methods only utilize part of the fluorescence in the detection and are not sensitive to weak fluorescence, they are greatly limited in the detection of low fluorescence quantum yields.

Method used

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  • Method and device for ultrafast time discrimination measurement of seed photo-signal
  • Method and device for ultrafast time discrimination measurement of seed photo-signal
  • Method and device for ultrafast time discrimination measurement of seed photo-signal

Examples

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Embodiment 1

[0084] The supercontinuum white light amplification of embodiment one water

[0085] Such as Figure 11 As shown, the ultrashort laser pulse source system 1 uses a titanium sapphire femtosecond laser and a laser frequency doubling crystal. The laser frequency doubling crystal should be able to work in the infrared to ultraviolet band, and its refractive index can be in phase with the optical parameter of the working band. Matched nonlinear crystals, such as BBO crystals, KTP crystals, LiNbO 3 crystals etc. In this embodiment, a crystal BBO (the crystal is used for frequency doubling, denoted as BBO1 ) is used, and it is arranged after the energy adjustment, collimation and beam reduction and spatial filtering system 2 . The femtosecond laser outputs an infrared pulse with a central wavelength of 800nm, a pulse width of 120fs, an energy of 400μJ, and a repetition rate of 1kHz. Femtosecond pulses at 400 nm with an energy of 70 μJ. After the femtosecond pulse is split by the ...

Embodiment 2

[0091] Fluorescence amplification of embodiment two DCM dyes

[0092] Similar to the supercontinuous white light amplifying device of Example 1 "the sample is water", such as Figure 13 As shown, the ultrashort laser pulser uses a titanium sapphire femtosecond laser and a laser frequency doubling crystal. The femtosecond laser output is an infrared pulse with a center wavelength of 800nm, a pulse width of 120fs, an energy of 400μJ, and a repetition rate of 1kHz. After the pulse is collimated by narrowing the beam (or adding vacuum pinhole spatial filtering), it is passed through the BBO 1 After frequency doubling, a femtosecond pulse with a wavelength of 400nm and an energy of 70μJ is obtained. After the femtosecond pulse is split by the beam splitter BS, the 400nm frequency doubled pulse passes through the ultra-fine numerical control mobile platform, the total reflection mirror M4, M5, lens L2 and other components After processing, it is sent to the parameter amplification ...

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Abstract

The invention relates to a method and a device, which conducts super-fast time identification and measurement to seed optical signal. The method essentially includes the following steps: (1) super short laser pulse produced by a laser pulse light source is split into two paths by an optical beam splitting system after energy regulation, collimated beam narrowing and spatial filtering system optimization and selection, among which one path passes a time delay control system and a parameter pump pulse optical path, and the other path passes a seed exciting pulse optical path; (2) the collected seed optical signal and the pump pulse incident into a parameter amplifying system, so that the parameter amplifying system conducts ultra fast amplification to the sample seed optical signal under a linear amplifying state; (3) a parameter amplifying signal detecting system is used to detect, record, refer to and revise the signal, and give corresponding detecting result to ultra fast spectra analysis and time identification and measurement of amplifying the seed optical signal. The invention can amplify the weak seed optical signal and realize detection of ultra fast time identification, and is a novel detecting method in the field of ultra fast spectroscopy.

Description

technical field [0001] The invention relates to a method and device for fast measurement and time resolution of femtosecond laser pulses, in particular to a method and device for ultrafast time resolution measurement of seed optical signals. Background technique [0002] Femtosecond (femtosecond, abbreviated as fs, 1fs=10 -15 s) Due to its extremely high-precision time resolution, laser pulses have become an extremely important and even the only means for people to study ultrafast transient phenomena today. Driven by the strong drive of demand, people are not only interested in the generation technology of such pulses, but also in the basic research work on their own performance. It is also under the support of some forward-looking basic research that some ultra-fast and ultra-intense laser pulse generation equipment with adjustable wavelength, ideal bandwidth and pulse width, and extremely high energy have emerged one after another, and have been applied to more and more r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00G01J3/28
Inventor 李锋铭王树峰杨宏龚旗煌
Owner PEKING UNIV
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