Study of a high-resolution infrared spectrometer by using an integrated multigrating structure

Abstract

A new type of infrared spectrometer system working in the optical communication field has been studied and constructed. In order to achieve both high spectral resolution and fast data acquisition speed, an integrated grating with five subgratings and a set of five line-array InGaAs detectors are used to work in the 1450–1650nm wavelength range without any scanning and mechanical moving parts. The system has been calibrated with a spectral resolution of about 0.08nm and a fast data acquisition time of less than 40ms (>5nm∕ms) in the entire spectral range.