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Femtosecond inteferometer for testing diffuser optical characteristic

A technology of optical characteristics and scatterers, applied in the field of femtosecond interferometers, which can solve problems such as spectral linewidth and femtosecond holographic barriers

Inactive Publication Date: 2005-01-05
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the linewidth of femtosecond lasers is usually above 5nm, and the shorter the pulse, the wider the spectral line, which brings obstacles to many researches on femtosecond holography

Method used

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  • Femtosecond inteferometer for testing diffuser optical characteristic

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Embodiment Construction

[0026] See first figure 1 , figure 1 It is the structural block diagram of the femtosecond interferometer for testing the optical characteristics of the scatterer of the present invention. It can be seen from the figure. Its composition is that it includes a femtosecond laser 1, a beam splitter 2, and a plurality of mirrors 6, 7, 8, and 8. 9. Optical delay line composed of 9, 10, the first total reflection mirror 3, the second total reflection mirror 5, the third total reflection mirror 11, the half mirror 4, a sample room, a detector 12 and a calculator 13. The positional relationship of each component is as follows: install the beam splitter 2 on the laser output optical path of the femtosecond Ti:Sapphire laser 1 to obtain two output beams (A, B), the A beam passes through the second mirror 5, and the optical delay The wire, the third mirror 11 and the half mirror 4 enter the detector 12, and the B beam is reflected by the first mirror 3 into the sample 14, and then reflected b...

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Abstract

The invention is a femtosecond interferometer for testing the scattering body optical characters. It includes femtosecond laser, a splitter, an optical delaying line made up of several blocks of reflectors, the first holophote, the second holophote, the third holophote, a semitransparent and half-reflection mirror, a sample chamber, a detector and a computer. The relation between each component is: a splitter is arranged on the output light path of femtosecond titanium gem laser, acquires tow beams of output beams (A, B). The beam A enters the detector through the second reflector, optical delaying line, and the third reflector and the semitransparent and half-reflection mirror; but the beam B enters the sample through the first reflector, and then is reflected into the detector through the semitransparent and half-reflection mirror, meets with the beam A and intervenes, forms a hologram, the hologram is sent to the computer after being digitalized. The invention can provide the optical character of the strong scattering body with high precision and high resolution, and provides a strong tool and researching method for biomedicine.

Description

Technical field: [0001] The invention belongs to a physical testing instrument, especially a femtosecond interferometer for testing the optical characteristics of scatterers, which is suitable for testing the optical characteristics of various strong scatterers. Background technique: [0002] Since biological tissue is a highly scattering medium, when light propagates in a biological medium, not only does it absorb, but it also scatters. The degree of absorption and scattering is related to the incident wavelength. For red light and near-infrared light with wavelengths between 600-1000nm, the tissue absorbs the least, and the light attenuation is mainly due to scattering. Experimental measurements on human tissues show that the mean free path of near-infrared light propagating in tissues is generally tens to hundreds of microns, depending on the incident wavelength. [0003] The mechanism of optical imaging of biological tissues is the interaction between near-infrared light and ...

Claims

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Application Information

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IPC IPC(8): G01N21/45
Inventor 陈建文高鸿奕朱化凤李儒新徐至展
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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