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Journal of the Physical Society of Japan

A Michelson Interferometer for Relative Phase Locking of Optical Beams(Atomic and molecular physics)

Guowei Li, Sheng-Jhe Huang, Hsu-Sheng Wu, Shiang Fang, De-Sheng Hong, Tarek Ali Mohamed, Dian-Jiun Han

Published Feb 15, 2008• 0 citations
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Applied Optics•Feb 26, 2015•4 citations
A Michelson-type interferometer is built to dynamically lock the optical phase difference between the two-arm laser beams. The phase difference is tunable and allowed for continuous adjustments nearly by 160°. Under the best locking condition, a relative phase stability better than 0.1° is achieved starting from the original phase jitter of 10 to 15°. The interferometer is made by simply adding a pair of Brewster windows in one arm of the conventional setup, yet it provides much robust phase locking. It is readily applicable for optical lattice construction and nondestructive phase contrast imaging of ultracold atoms.
We developed a high resolution Michelson interferometer with a two-frequency He-Ne laser positioning system in order to stabilize the relative phase of a pulse pair. The control resolution corresponded to a 12 as time resolution or a phase of 1.5 degrees at 900 nm. This high resolution Michelson interferometer can generate a phase-locked pulse pair either with a specific relative phase such as 0 or pi radians or with an arbitrary phase. Coherent control of an InAs self-assembled quantum dot was demonstrated using the high resolution Michelson interferometer with a microspectroscopy system.
We propose an improved interference-based encoding that is suitable for security validation application. Two random phase masks are designed by a specific iterative phase retrieval algorithm; they serve as the system phase lock and the authentication key. In the validation process, two-beam interference is implemented using the two masks with a classical Michelson interferometer; the phase lock is fixed on one interference arm, and the authentication key is presented on another moveable arm, which can output two recognizable images by moving a certain distance. Without the correct authentication key, the secret image cannot be recognized even knowing the system lock. As a result, the validation result can be simply determined by checking the interference outputs. Numerical simulations are performed to demonstrate the validity and security of the proposed optical validation method.