Development of a phase contrast imaging system based on a yttrium aluminum garnet laser with folded beam for observations of density fluctuations in compact helical system.
A near-infrared laser phase contrast optical system incorporating a folded beam was developed in order to measure the distribution of density fluctuations in a high-temperature plasma. The coherent light source used was an yttrium aluminum garnet laser stabilized by a ring oscillator. The probe beam system separates and reflects the incident and exiting beams with a polarizer and a fully reflective mirror with a waveplate. This system was employed with a compact helical system to detect fluctuations at the plasma edge.
Matsuo
K
K
Fukuoka Institute of Technology, 3-30-1 Wajirohigashi Higashi-ku, Fukuoka-shi, Fukuoka 811-0295, Japan.
Uchida
N
N
Kawakubo
M
M
Iguchi
H
H
Okamura
S
S
Matsuoka
K
K
Akiyama
T
T