Armstrong, Westerman, Hattori, McLeland and Naughton
Device for producing an electric potential having a difference frequency of a self-mixed signal in a laser resonator
 A device and method for measuring a difference frequency having a simple structure and utilizing optogalvanic effect for measuring a difference frequency when carbon dioxide laser light of a single wavelength is varied in frequency by a measuring object. When a part of frequency varied laser light is mixed with an original frequency of laser light by self-mixing in a laser resonator, a strength of the laser light in the resonator is modulated to a difference frequency between the original frequency and the variation frequency. Since a current change in response to strength of light is generated by the optogalvanic effect in the laser resonator, when a frequency of optogalvanic current change is measured, the difference frequency can be measured. 
Korea Research Institute of Standards and Science
G
G01J
inventional
Young-Pyung Yun-Myung Jong-Woon
Kim Kim Choi