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Digital holographic interferometer using simultaneously three lasers and a single monochrome sensor for 3D displacement measurements
Tonatiuh Saucedo-A., M. H. De la Torre-Ibarra, F. Mendoza Santoyo, Ivan Moreno
The use of digital holographic interferometry for 3D measurements using simultaneously three illumination directions was demonstrated by Saucedo et al. (Optics Express 14(4) 2006). The technique records two consecutive images where each one contains three holograms in it, e.g., one before the ... [Opt. Express 18, 19867-19875 (2010)]
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3D reconstruction of light flux distribution on arbitrary surfaces from 2D multi-photographic images
Xueli Chen, Xinbo Gao, Duofang Chen, Xiaopeng Ma, Xiaohui Zhao, Man Shen, Xiangsi Li, Xiaochao Qu, Jimin Liang, Jorge Ripoll, Jie Tian
Optical tomography can demonstrate accurate three-dimensional (3D) imaging that recovers the 3D spatial distribution and concentration of the luminescent probes in biological tissues, compared with planar imaging. However, the tomographic approach is extremely difficult to implement due to the ... [Opt. Express 18, 19876-19893 (2010)]
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Hiding objects and creating illusions above a carpet filter using a Fourier optics approach
Kedi Wu, Guo Ping Wang
Invisibility carpet cloaks are usually used to hide an object beneath carpet. In this paper we propose and demonstrate a carpet filter to hide objects and create illusions above the filter by using a Fourier optics method. Instead of using transformation optics, we get electromagnetic parameters of ... [Opt. Express 18, 19894-19901 (2010)]
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Ultrashort pulse generation from 1.56 µm mode-locked VECSEL at room temperature
Aghiad Khadour, Sophie Bouchoule, Guy Aubin, Jean-Christophe Harmand, Jean Decobert, Jean-Louis Oudar
We report on a picosecond pulse source delivering near transform-limited pulses in the 1.55 µm wavelength region, based on an optically pumped InP-based mode locked Vertical External Cavity Surface Emitting Laser (VECSEL). The cavity combines two semiconductor elements, a gain structure which ... [Opt. Express 18, 19902-19913 (2010)]
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Voltage-assisted photoaligning effect of an azo dye doped in a liquid crystal with negative dielectric anisotropy
Kuang-Yu Yang, Wei Lee
We demonstrate a method of controlling the pretilt angle by field-assisted photoalignment in a vertically-aligned liquid crystal doped with a dichroic azo dye. By dynamically measuring both the pretilt angle and anisotropy in absorbance, we present detailed alignment variations in both the polar ... [Opt. Express 18, 19914-19919 (2010)]
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Broadband one-dimensional photonic crystal wave plate containing single-negative materials
Yihang Chen
The properties of the phase shift of wave reflected from one-dimensional photonic crystals consisting of periodic layers of single-negative (permittivity- or permeability-negative) materials are demonstrated. As the incident angle increases, the reflection phase shift of TE wave decreases, while ... [Opt. Express 18, 19920-19929 (2010)]
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Fast wideband source tuning by extra-cavity parametric process
Bill P.-P. Kuo, Stojan Radic
Fundamental and practical performance limits of continuously tunable optical sources using extra-cavity mixing process are examined. While the parametric process cannot overcome the fundamental tunable limit set by the uncertainty principle, it offers a new path in overcoming the practical ... [Opt. Express 18, 19930-19940 (2010)]
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Light fields with an axially expanded intensity distribution for stable three-dimensional optical trapping
Susanne Zwick, Christian Schaub, Tobias Haist, Wolfgang Osten
We introduce a new kind of light field to improve and simplify the trapping process of axially displaced particles. To this end we employ a light field with an axially expanded intensity distribution, which at the same time enables stable axial trapping. We present simulations of the axial ... [Opt. Express 18, 19941-19950 (2010)]
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An interferometric current sensor based on optical fiber micro wires
Mohammad Belal, Zhang-qi Song, Yongming Jung, Gilberto Brambilla, Trevor Newson
In this paper we demonstrate a compact current sensor using the optic fiber micro wire, based on the idea of interferometrically measuring the thermally induced optical phase shifts as a result of heat produced due to the flow of electric current over short transit lengths. A responsivity of ... [Opt. Express 18, 19951-19956 (2010)]
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Design of a Si-based lattice-matched room-temperature GeSn/GeSiSn multi-quantum-well mid-infrared laser diode
G. Sun, R. A. Soref, H. H. Cheng
This paper presents modeling and simulation of a silicon-based group IV semiconductor injection laser diode in which the active region has a multiple quantum well structure formed with Ge_0.9Sn_0.1 quantum wells separated by Ge_0.75Si_0.1Sn_0.15 barriers. These alloy compositions were chosen to ... [Opt. Express 18, 19957-19965 (2010)]
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