The Study of Retroreflective Laser Beams Interference Phase-Shift Effect

Abstract

Abstract: This paper describes a novel optical interference effect, namely retroreflective laser beams interference phase-shift effect. When a focused He-Ne laser beam passes through a cuvette containing liquid sample, the two reflective beams (retroreflective beams)coming from the front and the back surfaces of the cuvette will recombine and generate optical interference effect. The optical-phase-shift between retroreflective beams at the time t depends upon the changes in refractive index of the sample △n. It has been deduced that the relative change of signal intensity at the detector is proportional to △n under the condition of △nl<<λ, where l is the length of the sample within the cuvette and λ is the laser wavelength.The possibility of determining the small changes in the concentration of micro-volume sample was verified experimentally. Its application to the capillary electrophoresis detector was also demonstrated.

Key words: Laser, Refractive index, Interference phase-shift effect, Capillary electrophoresis

TrendMD:

DENG Yan-Zhuo, HE Jin-Lan. The Study of Retroreflective Laser Beams Interference Phase-Shift Effect[J]. Chem. J. Chinese Universities, 1994, 15(5): 667.

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The Study of Retroreflective Laser Beams Interference Phase-Shift Effect

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