Multiple-wavelength spectroscopic apparatus

Abstract

A multi-wavelength spectroscopic apparatus is provided. In the multi-wavelength spectroscopic apparatus using diffraction gratings, a first diffraction grating is a diffraction grating with diffraction efficiencies of p-polarized light and s-polarized light being equal on a short wavelength side of an operating wavelength range, and a second diffraction grating is a diffraction grating with diffraction efficiencies of p-polarized light and s-polarized light being equal on a long wavelength side of an operating wavelength range. By performing dispersion with two such diffraction gratings, it is possible to enlarge the amount of angular dispersion, and to produce a spectroscopic apparatus, which cancels wavelength dependencies of the diffraction efficiencies and has a small wavelength dependency of the diffraction efficiency.

Description

technical field [0001] The present invention relates to a spectroscopic device having the feature of simultaneously processing multiple wavelengths, and more particularly, the present invention relates to a structure of a spectroscopic unit which realizes miniaturization of an optical system and realizes low polarization within an operating wavelength range dependence and low insertion loss. Background technique [0002] In the past, spectroscopic devices were mainly used in measuring instruments and observation equipment to detect monochromatic spectra, etc. However, in recent years, due to the expansion of communication capacity by multiplexing in a certain wavelength range, and the expectation of using the difference in wavelength to obtain the flexibility of system operation, a kind of optical splitting device based on the simultaneous utilization of multiple wavelengths is sought. [0003] In order to apply a device including a spectroscopic device in an optical commun...

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Problems solved by technology

[0030] In addition to the problems of the second method, the third method also has the following problems, for example, the optical structure inside the device is three-dimensional (the array elements are tilted by 45 degrees with respect to the grooves of the diffraction grating), and the overall angular dispersion About 1 /  of the second method, as shown in Figure 4

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