Exploring novel methods of interferometric detection of ultrasmall phase shifts

Jaesuk Hwang; Martin M. Fejer; William E. Moerner

doi:10.1117/12.478913

19 June 2003 Exploring novel methods of interferometric detection of ultrasmall phase shifts

Jaesuk Hwang, Martin M. Fejer, William E. Moerner

Proceedings Volume 4962, Manipulation and Analysis of Biomolecules, Cells, and Tissues; (2003) https://doi.org/10.1117/12.478913
Event: Biomedical Optics, 2003, San Jose, CA, United States

Abstract

We propose a new method to detect ultrasmall nonreciprocal phase shifts in solids based on the Sagnac interferometer combined with internal optical modulation of the absorption. The Sagnac interferometer with heterodyne balanced detection is expected to enable shot-noise-limited detection of phase shift as a result of its insensitivity to frequency and amplitude fluctuations of the laser. The low-concentration molecular sample is internally modulated by optical saturation with a pulsed laser. This internal modulation makes the molecular absorption time-dependent, and also removes the possibility of amplitude modulation feedthrough. We describe the design of this experiment and present preliminary characterizations of the noise performance.

Citation Download Citation

Jaesuk Hwang, Martin M. Fejer, and William E. Moerner "Exploring novel methods of interferometric detection of ultrasmall phase shifts", Proc. SPIE 4962, Manipulation and Analysis of Biomolecules, Cells, and Tissues, (19 June 2003); https://doi.org/10.1117/12.478913

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