This guide provides detailed information about infrared detectors, which are utilized across various fields such as measurement, analysis, industry, communications, agriculture, medicine, physical-and-chemical science, astronomy, and aerospace. The document outlines the spectral response ranges supported by these detectors, emphasizing their versatility in the infrared region. It includes a comprehensive lineup of products offered by Hamamatsu, showcasing different types of infrared detectors such as InGaAs PIN photodiodes, InAs photovoltaic detectors, and thermopile detectors. Each product is described with its specific spectral response range, peak sensitivity wavelength, and other technical specifications. The guide aims to assist users in selecting the appropriate infrared detector for their specific applications, ensuring optimal performance based on the required spectral response. The information is structured to facilitate easy navigation and understanding of the various options available in the infrared detector market.