title: Automated optical field mapping using a single-mode fiber interferometer.
abstract: Spatial distribution of optical phase and amplitude can be measured by using a single-mode optical-fiber interferometric system. Following the first proposal of the measuring principle by the present authors in 1978, a further development of the measuring system is now reported. The major achievement is the use of a novel spatial filter and a set of photodetectors by which the interference fringe position is located. Combining them with analog signal-processing circuitry and with a mechanical feedback system, fully automated recording of the optical phase and amplitude distribution is successfully achieved. The method is used to measure phase-front distribution near a Gaussian beam waist.
authors.forename: M
authors.initials: M
authors.lastname: Liyama
authors.forename: T
authors.initials: T
authors.lastname: Kamiya
authors.forename: H
authors.initials: H
authors.lastname: Yanai