Normal-temperature normal-pressure femto-second CARS (Coherent Anti-stokes Raman Spectroscopy) time-resolved spectrum measuring system

A technology of time-resolved spectroscopy and measurement systems, applied in optical radiation measurement, measurement devices, spectrometry/spectrophotometry/monochromator, etc., to achieve clear and visible periodic changes, precise resolution, and easy experimental conditions Effect

Inactive Publication Date: 2010-09-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing gas femtosecond CARS time-resolved spectrum measurement needs to be carried out under the experimental conditions of high temperature and high pressure, and provides a femtosecond CARS time-resolved spectrum measurement system at normal temperature and pressure

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  • Normal-temperature normal-pressure femto-second CARS (Coherent Anti-stokes Raman Spectroscopy) time-resolved spectrum measuring system
  • Normal-temperature normal-pressure femto-second CARS (Coherent Anti-stokes Raman Spectroscopy) time-resolved spectrum measuring system
  • Normal-temperature normal-pressure femto-second CARS (Coherent Anti-stokes Raman Spectroscopy) time-resolved spectrum measuring system

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specific Embodiment approach 1

[0017] Specific implementation mode one: combine figure 1 Illustrate this specific embodiment, the normal temperature and pressure femtosecond CARS time-resolved spectral measurement system, which includes a femtosecond laser 1, a first optical parametric amplifier OPA1, a second optical parametric amplifier OPA2, a first beam splitter D1, a second beam splitter Sheet D2, first mirror R1, second mirror R2, third mirror R3, fourth mirror R4, fifth mirror R5, sixth mirror R6, seventh mirror R7, eighth mirror R8 , the ninth reflector R9, the tenth reflector R10, the eleventh reflector R11, the twelfth reflector R12, the thirteenth reflector R13, the fourteenth reflector R14, the fifteenth reflector R15, the first Optical delay line DL1, second optical delay line DL2, first lens L1, second lens L2, third lens L3, filter FL, sample cell 2, probe 3, monochromator 4, photomultiplier tube 5, BOXCAR6, oscilloscope 7 and spatial filter 8,

[0018] The laser light output by the femtose...

specific Embodiment approach 2

[0035] Specific implementation mode two: the following combination figure 2 This embodiment will be specifically described. The difference between this specific embodiment and the normal temperature and pressure femtosecond CARS time-resolved spectral measurement system described in the first specific embodiment is that it also includes a first aperture H1, a second aperture H2, a third aperture H3, a fourth aperture Diaphragm H4, fifth diaphragm H5 and sixth diaphragm H6, the first diaphragm H1 is placed on the optical path of the beam C reflected from the first mirror R1 to the second mirror R2, the second diaphragm H2 is placed on the beam C is reflected from the second mirror R2 to the optical path of the second beam splitter D2, and the third aperture H3 is placed on the optical path of the Stokes beam F reflected from the tenth mirror R10 to the eleventh mirror R11, The fourth aperture H4 is placed on the optical path of the Stokes beam F reflected from the twelfth mir...

specific Embodiment approach 3

[0037] Embodiment 3: The difference between this embodiment and the normal temperature and pressure femtosecond CARS time-resolved spectral measurement system described in Embodiment 1 is that femtosecond laser 1 pumps the first optical parametric amplifier OPA1 and the second optical parametric amplifier. OPA2, applying the sum frequency, difference frequency and frequency doubling technology to output 240 nanometers to 20 microns full computer automatic control femtosecond tunable laser, the femtosecond laser 1 is a kilohertz femtosecond laser manufactured by Coherent Company of the United States, the described The central wavelength of the laser output by the femtosecond laser 1 is 800nm, the pulse energy is 2.5mJ, and the pulse width is 40fs; the first optical parametric amplifier OPA1 and the second optical parametric amplifier OPA2 are TOPAS-800-fs manufactured by Coherent Corporation of the United States Optical Parametric Amplifier.

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Abstract

The invention relates to a normal-temperature normal-pressure femto-second CARS (Coherent Anti-stokes Raman Spectroscopy) time-resolved spectrum measuring system which relates to the technical field of nonlinear optics and solves the problem of multiple limiting factors of traditional femto-second CARS time-resolved spectrum measuring experiment. Beams output by a femto-second laser are adjusted through a series of reflectors and optical delay lines by the system to form three bundles of beams which have approximate energy and are respectively positioned on three peaks of a square on the vertical direction of the beams, the beams are focused to a sample pool and then emit a new beam along a specific angle, i.e. a CARS signal, the CARS signal is filtered through a filter plate, then received by a probe and input to a monochromator, the data acquisition of an electrical signal converted by a photomultiplier is carried out by utilizing BOCCAR, and the data are input to a computer for data processing. The invention can carry out femto-second CARS time-resolved spectrum measurement under the experimental conditions of normal temperature and normal pressure and is applicable for the femto-second CARS spectrum measurement of gas samples and liquid samples in a static sample pool.

Description

technical field [0001] The invention relates to the technical field of nonlinear optics, in particular to a CARS spectrum measurement system under normal temperature and pressure experimental conditions. Background technique [0002] CARS (Coherent Anti-Stokes Raman Scattering), that is, coherent anti-Stokes Raman scattering is a coherent nonlinear laser spectroscopy technology, which has the advantages of good directionality, high sensitivity and strong anti-background interference ability. applied to many fields. With the advent of femtosecond lasers, using femtosecond laser pulses as light sources, femtosecond CARS with ultra-fast time resolution and high signal strength has been widely used in coherent control of chemical reactions, biological microscopic imaging, trace elements, etc. and free radical concentration detection, combustion diagnosis and other fields; use femtosecond CARS time-resolved spectroscopy to study ultrafast intramolecular dynamics; provide the str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/44G01N21/65G01N21/01
Inventor 陈德应夏元钦张天天贺平于欣樊荣伟
Owner HARBIN INST OF TECH
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