Title :
Possibility of measuring displacement with sub-nanometre accuracy by ring laser operating in lock-in regime
Author :
Son, Jung-Young ; Strilets, I.A. ; Chun, Joo-Hwan ; Shin, Sanghun ; Choi, Yong Jin ; Lee, Hyuk Soo
Author_Institution :
Korea Inst. of Sci. & Technol., Seoul, South Korea
fDate :
7/22/1999 12:00:00 AM
Abstract :
The intensity difference between counterpropagating waves in ring lasers with back-reflection waves from external mirrors is analysed to enable a highly accurate measurement of displacement to be obtained. The difference is expressed as a periodic function of the distances between the ring laser mirrors and their corresponding mirrors. The measurement accuracy attainable with the difference can be in the sub-nanometre range
Keywords :
displacement measurement; gyroscopes; laser mirrors; light interferometers; light interferometry; measurement by laser beam; ring lasers; back-reflection waves; counterpropagating waves; displacement measurement; external mirrors; gyroscope; highly accurate measurement; intensity difference; lock-in regime; periodic function; ring lasers; sub-nanometre accuracy;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19990878
