TEM10 homodyne detection as an optimal small displacement and tilt measurements scheme
Vincent Delaubert, Nicolas Treps, Mikael Lassen, Charles C. Harb, Claude Fabre, Ping Koy Lam, Hans A. Bachor
Abstract
We report an experimental demonstration of optimal measurements of small displacement and tilt of a Gaussian beam - two conjugate variables - involving a homodyne detection with a TEM10 local oscillator. We verify that the standard split detection is only 64% efficient. We also show a displacement measurement beyond the quantum noise limit, using a squeezed vacuum TEM10 mode within the input beam.
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