A brief introduction to the IRS1000H portable Raman spectrometer, which is a professional refrigeration portable Raman spectrometer. The IRS1000H Raman spectrometer is equipped with a deep cooled fiber optic spectrometer, which adopts a transmission grating and C-T optical path design inside. Through optimized optical path design and strict selection of optical components, the IRS1000H portable Raman spectrometer can achieve higher spectral resolution and eliminate stray light interference inside the spectrometer. Simultaneously using a detector with two-stage cooling and active heat dissipation, it can achieve a deep cooling mode, with a minimum cooling effect of -25 ℃, and control the dark noise of the spectrometer within ± 8counts.