Recent progress in two-color laser diagnostics

Abstract

This paper describes an innovative laser diagnostic instrument, a two color FIR laser interferometer/polarimeter, under development at the National Institute for Fusion Science, aiming for the establishment of reliable electron density/current density profile measurement techniques in the next step magnetically confined fusion devices such as ITER. In the process of searching for new laser oscillation lines, we have successfully achieved the powerful laser lines simultaneously oscillating at 57.2 and 47.7 μm, which lead to the construction of a new type of two color laser interferometer. So far we have been developing a two color laser interferometer, and confirmed its original function, vibration subtraction, in a test stand. In this conference, development of laser diagnostics which is a combined system of a two color laser interferometer and a polarimeter including hardware development necessary for future fusion devices will be presented.