Topics in this Issue
Out-of plane deformation measurements of the 3 m diameter Backplane Stability Test Article (BSTA) for the James Webb Space Telescope, obtained by a spatially phase-shifted digital speckle-pattern interferometer. The "snapshots" are taken with temperature intervals of 2 K during a 40 K to 60 K test. The dark red indicates 1.8 μm deformation toward the observer; the dark blue indicates 3.0 μm deformation away from the observer. The mirror segment assembly fittings (squares) bend away from the observer due to the negative coefficient thermal expansion of lnvar. The frame tubes bulge forward because of their "hour-glassing" behavior as a function of temperature. For further details, see the paper by Saif et al. pp. 737-745.
- Aug 20 2014 : Optica Research | UAlberta Engineers Take Major Step Toward Photonic Circuits - nano-optical cables that could replace copper wiring on computer chips… more
- Aug 06 2014 : New Hand-Held Device Uses Lasers, Sound Waves for Deeper Melanoma Imaging - A new hand-held device that uses lasers and sound waves may change... more
- Jul 30 2014 : OSA Journal Portfolio Continues to Lead Optics Category in Total Citations and Articles in Thomson Reuters 2014 Journal Citation Reports - The Optical Society (OSA) is pleased to announce its full portfolio... more
- Jul 28 2014 : Wearable Device for the Early Detection of Common Diabetes-related Neurological Condition - A group of researchers in Taiwan has developed a new optical... more
- Optical properties of the metals Al, Co, Cu, Au, Fe, Pb,...
- Optical properties of metallic films for vertical-cavity...
- Laser Beams and Resonators
- Fast & Furious focal-plane wavefront sensing
- Optical Constants of Water in the 200-nm to 200-?m...
- Exact analytic solutions of Maxwell’s equations...
- Phase retrieval algorithms: a comparison
- Simplifying numerical ray tracing for characterization of...
- Model-based phase shifting interferometry
- Measuring refractive index using the focal displacement...