Acousto-optic modulation-based 2mu m polarized orthogonal laser emitting system applied to laser heterodyne interferometer

• Main Authors: WANG CHUNHUI, GAO LONG, CONG HAIFANG, LI YANCHAO, QU YANG
• Format: Patent
• Language: Chinese; English
• Published: 07.03.2012
• Subjects: BASIC ELECTRIC ELEMENTS; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DEVICES USING STIMULATED EMISSION; ELECTRICITY; FREQUENCY-CHANGING; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TESTING

The invention discloses an acousto-optic modulation-based 2mu m polarized orthogonal laser emitting system applied to a laser heterodyne interferometer, which relates to a polarized orthogonal laser source emitting system. The system solves the problem of low measurement precision of the laser heterodyne interferometer due to polarized mixing error of the conventional orthogonal polarized light source emitting system. The system comprises a 2mu m laser device, a plurality of fiber collimators, a polarization sheet, a fiber beam splitter, two acousto-optic frequency shifters, a polarization controller, a polarized beam splitter prism and a plurality of fibers, wherein the laser of the 2mu m laser device passes through the fiber collimators and the polarization sheet and then enters the fiber beam splitter, the input laser is split into two beams of P laser by the fiber beam splitter, one beam of P laser enters one acousto-optic frequency shifter through the fibers to perform frequency shift and then enters the