Coaxial optical system of spectrometer using volume holographic grating and prism to split light

Abstract

The invention discloses a spectrometer coaxial optical system adopting a combination of two volume holographic gratings and a prism for light splitting, relates to the field of spectrometer light splitting systems and solves the problem that an existing off-axis-type grating dispersion spectrum system is large in size, difficult to mount and adjust and low in stability. The spectrometer coaxial optical system comprises an imaging lens, a slit, a collimating lens, a light splitting element, a converging lens and a CCD (charge coupled device) detector, the slit is positioned at an image focal point of the imaging lens, the light splitting element comprises the volume holographic gratings which are completely identical and the prism, the volume holographic gratings are glued on two sides of the prism respectively, the imaging lens images object light in the slit, the collimating lens collimates the object light to be parallel light, and the parallel light is refracted at an interface of the first volume holographic grating and the prism to enter the prism after diffraction light splitting through the first volume holographic grating, totally reflected on the undersurface of the prism to reach an interface of the prism and the second volume holographic grating and converged on the CCD detector through the converging lens after diffraction light splitting through the second volume holographic grating. The spectrometer coaxial optical system is compact in structure, simple to mount and adjust and high in light energy utilization rate.

Description

technical field [0001] The invention relates to the technical field of spectrometer light-splitting systems, in particular to a spectrometer coaxial optical system that uses volume holographic gratings and prisms for light-splitting. Background technique [0002] The spectrometer is an instrument used to obtain the spectral information of the target. It detects and identifies the target or analyzes the material composition through the spectral image of the target. It is widely used in the fields of national production, scientific research and military affairs. [0003] The spectrometer spectroscopic system can be divided into dispersion type and modulation type according to its spectroscopic principle. The dispersion type is divided into a prism dispersion spectroscopy system and a grating dispersion spectroscopy system, and the modulation type is mainly a Fourier transform system. In the dispersive spectral spectroscopic system, the dispersion rate of the prism is low, the...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of large volume, difficult installation and adjustment, and poor stability existing in the existing off-axis grating dispersion spectroscopy system, the present invention provides a spectrometer coaxial optical system that uses a volume holographic grating and a prism to split light

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