Multipass optical system excitation Raman spectra

摘要

Optical system excitation Raman spectra invention relates to analytical instrument engineering and is intended to increase the intensity of the Raman scattering signal light (RED) by repeatedly passing the laser beam through one point in space from which scattered light is collected. The invention can be used in gas-Raman spectrometer or other devices requiring an increase the power density of laser radiation in one point. System consists of a laser, as well as sequentially disposed on the main optical axes of the two identical positive lens, which focuses coincide, and returning a Porro prism additionally installed before the first lens, another Porro prism. Moreover, this prism is mounted so as to face the largest face of the lens, while each reflecting face forms an angle of 45 degrees with the main optical axis in the plane containing the laser beam, and, in relation thereto, the prism is set so that is spaced from its axis at distance l = d / 2, where d - diameter of the laser beam.