Method of reducing optical interference and cross -talk of double optical tweezers using a single laser light source , and apparatus

摘要

Low drift of sensitivity and high power is required in order to study experimentally the mechanism of one molecule, which are achieved by the optical tweezers using optical tweezers device for force measurement. Is separated by the polarizer, and is condensed by the objective lens of high numerical aperture, CW infrared laser beam, producing two traps. It is used the same laser, and and produced the trap of both, to the force measured by back focal plane interferometry. Two beams to be incident on the optical microscope portion is to be such that the orthogonal polarization each other, large parasitic signal regardless, interference occurs to them. As a result of comparison to the light optical model results of the experiment, the interference pattern, (found to be) that is caused by the polarized light is rotated by the slide glass and the lens surface of the optical microscope portion. The two methods for reducing the cross talk, it is possible, and the polarization modified by passing two times the optical microscope portion, to frequency shift the one of the laser are separated.