Optics & Photonics News

COVER STORY

Mid-IR Spectroscopic Sensing

Nathalie Picqué and Theodor W. Hänsch

Advances in mid-IR light sources and spectrometers are spurring development of fast, powerful instruments to explore a range of scientific, industrial and biomedical problems.

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IMAGE OF THE WEEK

Interference Butterfly
Interference Butterfly

Creation of this interference photograph began with opaque masks of green, blue, violet and black, with zones of partial transparency in areas of the photo where the color was to appear. The photosensitive element (PSE)—which was not panchromatic, but was sensitive only to the monochromatic light of the 632.8-nm illuminating laser—comprised a transparent base layer, a photosensitive layer, an index-matching fluid and an angular reflecting layer. The colors in the photograph arise from the different angles of incidence that the wave normal of the laser beam (expanded to a center diameter of around three inches) made with the PSE. The incident light interfered with the reflected light to form standing waves that were recorded by the PSE as partially reflecting, equally spaced layers. The spacing of those layers, when the recorded photograph is viewed in white light, determines the color reflected to the viewer’s eye.


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OSA Publishing

Recently Published

Synchronous in-phase and quadrature demodulation technique for resonant micro-optic gyroscope

Applied Optics, Vol. 58 Issue 18, pp.5050-5056 (2019)
The phase modulation and demodulation technique is widely used in resonant optical gyroscopes to accurately detect resonance frequencies, which dir...

Gradient-index dark hole based on conformal mapping with etendue conservation

Optics Express, Vol. 27 Issue 13, pp.18493-18507 (2019)
An omnidirectional light collector consisting of an axisymmetric spatially gradient refractive index medium can almost perfectly absorb light rays,...

Measurement of 85Rb nP-state transition frequencies via single-photon Rydberg excitation spectroscopy

JOSA B, Vol. 36 Issue 7, pp.1850-1857 (2019)
We report the measurement of transition frequencies of Rb85 atoms in a room-temperature vapor cell to nP1/2 (n=34–53) and nP...

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