Spectral measurnig device

摘要

A holder ( 30 ) that holds a specimen ( 100 ) is disposed outside a vacuum chamber ( 50 ) with a light transmission window ( 52 a). A light detection unit and a light radiation unit having a terahertz light generator ( 6 ) are fixed on a base ( 53 ) disposed inside the vacuum chamber. The light radiation unit irradiates terahertz pulse light onto the specimen ( 100 ) placed outside the vacuum chamber via the light transmission window ( 52 a) and the resulting specimen light from the specimen ( 100 ) is received at the light detection unit via the light transmission window ( 52 a). The base ( 53 ) in the vacuum chamber and the holder ( 30 ) disposed outside the vacuum chamber are connected via a connecting member ( 54 a) passing displaceably through a barrier wall of a vacuum chamber ( 50 ) with airtight sealing so as to fix the relative position of the holder to the base.