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Stable, mode-matched, medium-finesse optical cavity incorporating a microcantilever mirror: Optical characterization and laser cooling
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10.1063/1.2405373
/content/aip/journal/rsi/78/1/10.1063/1.2405373
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/1/10.1063/1.2405373
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Scale drawing of the cavity. The cantilever chip is visible at the right-hand side of the drawing; the cantilever itself is not visible at this scale. Also shown is the orientation of the coordinate system used in the text. The coordinate system’s origin is at the center of curvature of the input coupler. The force of gravity points along the negative direction.

Image of FIG. 2.
FIG. 2.

Reflected intensity as a function of cantilever displacement for four different cavity geometries. In (a) the cantilever is positioned at approximately {0, 0, }, i.e., towards the input coupler from the input coupler’s center of curvature (the coordinate system is given Fig. 1). The cavity is nominally stable, but diffraction losses appear to limit the finesse. Multiple transverse modes are visible within each free spectral range. In (b) the cantilever is approximately at {0, 0, 0}, i.e., the hemispherical configuration. Here the finesse is at its maximum and the transverse modes visible in (a) have become degenerate. In (c) the cantilever is at {0, 0, }. This renders the cavity unstable and leads to a low finesse. In (d) the cantilever is approximately at {0, , 0}. Here the input beam only partially overlaps with the cantilever.

Image of FIG. 3.
FIG. 3.

A more detailed scan of the cavity reflection peak. Here the cantilever is positioned at approximately {0,0,0}, i.e., in the hemispherical geometry. The solid line is a fit to the formula given in the text and corresponds to a finesse .

Image of FIG. 4.
FIG. 4.

Laser cooling of the cantilever. The power spectral density of the cantilever displacement, , is plotted with the cooling laser off (squares) and on (circles). The solid lines are fits to the expected form for a damped harmonic oscillator. With the cooling laser off, the fit gives . With the cooling laser on, .

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/content/aip/journal/rsi/78/1/10.1063/1.2405373
2007-01-22
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stable, mode-matched, medium-finesse optical cavity incorporating a microcantilever mirror: Optical characterization and laser cooling
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/1/10.1063/1.2405373
10.1063/1.2405373
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