Patent ID: 8742353
Filing Date: 2014-06-03
Classification: G01N

Abstract:
1. A single terahertz wave time-waveform measuring device comprising: a light source which outputs pulsed light; a separator which two-separates the pulsed light output from the light source, and outputs one of the two-separated pulsed lights as a pump light and the other as a probe light; a terahertz wave generator which generates and outputs a terahertz wave by receiving an input of the pump light output from the separator; a wave synthesizer which receives inputs of the terahertz wave which was output from the terahertz wave generator and transmitted through or reflected by an object to be measured and the probe light which was output from the separator and reached, and synthesizes coaxially and outputs the terahertz wave and the probe light; an electro-optic crystal which receives inputs of the terahertz wave and the probe light output from the wave synthesizer, induces birefringence along with propagation of the terahertz wave, and changes a polarized state of the probe light by the birefringence and outputs the probe light; a pulse front tilting unit which makes pulse fronts of the terahertz wave and the probe light when being input into the electro-optic crystal nonparallel to each other by tilting the pulse front of any of the pump light, the terahertz wave, and the probe light; and a detecting device which detects a distribution of polarized state changes on a beam cross-section of the probe light output from the electro-optic crystal.