Patent ID: 9696206
Date: 2017-07-04
CPC Classifications: G01J,G01N

Claim:
1. A terahertz-wave spectrometer comprising: a light source for emitting laser light; a branching unit for splitting the laser light emitted from the light source into pump light and probe light; a terahertz-wave generator for generating a terahertz wave in response to the pump light incident thereon after branching off at the branching unit; a spectroscopic prism, having entrance and exit surfaces for the terahertz wave and an arrangement surface for one or more objects to be measured, for propagating therewithin the terahertz wave incident on the entrance surface, causing the arrangement surface to reflect or transmit therethrough the terahertz wave, and then emitting the terahertz wave from the exit surface; and a terahertz-wave detector for receiving the terahertz wave emitted from the exit surface of the spectroscopic prism and the probe light branching off at the branching unit and detecting a correlation between the terahertz wave and the probe light, wherein, in the spectroscopic prism, a prism part including the arrangement surface is configured to slide with respect to a main part in the width direction of the main part in a direction intersecting the optical path of the terahertz wave transmitted through the spectroscopic prism, while a plurality of arrangement regions to be arranged with the one or more objects are provided in the arrangement surface in the prism part along a sliding direction, the arrangement surface thus being configured so that after completing the measurement of one object the prism part can be slid so as to shift the next object onto the optical path of the terahertz wave so that a plurality of objects can be measured smoothly and continuously, wherein the main part is provided with a groove into which the prism part including the arrangement surface is slidably fitted, and wherein the prism part has a surface contacting the main part.