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A portable high-resolution optical fiber cars micro-excitation source device and its implementation method

A high-resolution, excitation source technology, applied in measurement devices, optics, analytical materials, etc., can solve the problems of slow tuning speed, poor repeatability, large and complex systems, etc., to achieve reliable spectral compression, strong environmental interference resistance, and improved The effect of spectral resolution

Active Publication Date: 2015-12-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, CARS microscopy and spectroscopy systems mainly use two Ti:Sapphire lasers with feedback control or two optical parametric oscillators pumped by the same pump source as the excitation source. It is difficult to adjust the synchronization of pump light and Stokes light. Wavelength tuning uses a mechanical device, the tuning speed is slow, and the repeatability is poor, which makes the whole system huge and complicated, requiring full-time technicians to maintain and adjust the system, which seriously hinders the wide application of CARS

Method used

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  • A portable high-resolution optical fiber cars micro-excitation source device and its implementation method
  • A portable high-resolution optical fiber cars micro-excitation source device and its implementation method

Examples

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Embodiment 1

[0029] Example 1: Portable high-resolution optical fiber CARS micro-excitation source device

[0030] A portable high-resolution optical fiber CARS microscopic excitation source device and method, the specific implementation examples are as follows: the whole device consists of: femtosecond fiber laser light source 1, beam splitter 2, electronically controlled phase retarder 3, polarizer 4, Photonic crystal fiber 5, multimode fiber 6, single-mode fiber 7, electronically controlled delay line 8, beam combiner 9, output port 11, in specific implementation, the light source 1 is a femtosecond fiber laser light source, the pulse width is 100fs, the center The wavelength is from 600nm to 980nm, and the modulation frequency is within 100MHz.

[0031] The femtosecond laser pulse provided by the femtosecond fiber laser source has a pulse width of 60-150fs, a center wavelength of 600nm-1060nm, a repetition frequency of 50-200MHz, and an average power of 80mW-200mW;

[0032] The electr...

Embodiment 2

[0040] Embodiment 2: Generation method of portable high-resolution optical fiber CARS microscopic excitation source

[0041] The femtosecond laser pulse is generated by a femtosecond fiber laser, and passes through a beam splitter to generate two beams of femtosecond pulse light, which are used as pump light and Stokes light respectively. The Stokes light changes the polarization state after passing through the electronically controlled phase retarder, and then combines the analyzer to modulate the power of the pulsed laser. In the photonic crystal fiber, femtosecond pulsed light with different powers produces different optical soliton frequency shifts, realizing Fast and wide tuning, and then through the serial connection of multi-mode fiber and single-mode fiber, the chirp processing of Stokes light pulses is realized to compress the spectral width; the other beam of pump light is adjusted by an electronically controlled delay line to make it Synchronized with the Stokes lig...

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Abstract

The invention discloses a portable high-resolution optical fiber CARS microscopic excitation source device and an implementation method. The device sequentially comprises a femtosecond optical fiber laser light source (1), a beam splitter (2), an electronically-controlled phase delayer (3), an analyzer (4), a photonic crystal fiber (5), a multimode fiber (6), a single mode fiber (7), an electronically-controlled delay line (8), a beam combiner (9), an output port (11) and a control module (10) according to the sequence from input to output. The portable high-resolution optical fiber CARS microscopic excitation source device has the advantages that the optical fiber structure is adopted, environment anti-interference performance is high, and the device is portable and has the ability to be quickly connected with a commercialized microscope to enable a CARS imaging function to be achieved; chirp processing can be carried out on pulsed light by means of the combined optical fiber structure, the stable and reliable spectral compression is achieved, and the spectral resolution is improved.

Description

technical field [0001] The invention belongs to the field of nonlinear optical imaging, and in particular relates to a portable high-resolution optical fiber excitation source for CARS microscopic imaging, which can be used for detection of material components in the fields of biology and chemistry. Background technique [0002] Coherent Anti-Stokes Raman Scattering (CARS) uses four-wave mixing to detect molecular vibrations. When the frequency difference between pump light and Stokes light is equal to the vibration frequency of the molecule to be detected, the natural vibration of the molecule is resonantly enhanced. , when the probe light interacts with it, a strong anti-Stokes scattering signal will be generated. The CARS signal is generated in the coherent process, and the signal has strong directionality and is easy to collect. The CARS signal is anti-Stokes light, which is blue-shifted relative to the excitation light, and it is easy to filter out the interference of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35G01N21/01
Inventor 江俊峰刘铁根刘琨郭洪龙
Owner TIANJIN UNIV
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