Problems regarding linearity of data of a laser interferometer with a single-frequency laser |
| |
Affiliation: | a Institute of Scientific Instruments of the Academy of Sciences of the Czech Republic, Královopolská 147, 612 64 Brno, Czech Republic |
| |
Abstract: | In this paper, the main causes of scale nonlinearity of a laser interferometer with a single-frequency laser and a quadrature fringe detection system are described. The primary causes of scale nonlinearity are quadrature phase shift error and imperfect optical elements in the interferometer and detection unit. A method for measuring this nonlinearity with an optical compensator is described. Nonlinearities arising from quadrature phase shift error, unequal amplitudes, and electronic offsets in the detection unit can be compensated by means of a PC program as described herein. By using a differential interferometer with a resolution of 0.3 nm, the nonlinearity compensation was experimentally verified, and by averaging the measured values for 20 s, a linearity better than ±0.5 nm was achieved. |
| |
Keywords: | Interferometers Laser applications Phase shift Optical devices Interferometry Laser interferometer Single frequency laser |
本文献已被 ScienceDirect 等数据库收录! |
|