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Showing 1 to 12 of 50459 entries
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High-resolution digital holography utilized by the subpixel sampling method.

Applied optics

Claus D, Fritzsche M, Iliescu D, Timmerman B, Bryanston-Cross P.
PMID: 21857692
Appl Opt. 2011 Aug 20;50(24):4711-9. doi: 10.1364/AO.50.004711.

A novel (to our knowledge) approach for resolution improvement in digital holography is presented in this paper. The proposed method is based on recording the incoming interference field on a complementary metal-oxide semiconductor (CMOS) camera with subpixel resolution. The...

Optimal proportional relation between laser power and pulse number for the fabrication of surface-microstructured silicon.

Applied optics

Peng Y, Wen Y, Zhang D, Luo S, Chen L, Zhu Y.
PMID: 21857699
Appl Opt. 2011 Aug 20;50(24):4765-8. doi: 10.1364/AO.50.004765.

We experimentally demonstrate that, under the same laser fluence, there exists an optimal proportional relation between the laser power and pulse number for the fabrication of surface-microstructured silicon. During this fabrication process, the pulse number represents the interaction time...

Characterization of the optical properties of an infrared blocked impurity band detector.

Applied optics

Woods SI, Kaplan SG, Jung TM, Carter AC.
PMID: 21857706
Appl Opt. 2011 Aug 20;50(24):4824-33. doi: 10.1364/AO.50.004824.

Si:As blocked impurity band detectors have been partially deprocessed and measured by Fourier transform spectroscopy to determine their transmittance and reflectance at cryogenic temperatures over the wavelength range 2 μm to 40 μm. A method is presented by which...

Infrared/millimeter wave mirror array beam combiner design and analysis.

Applied optics

Tian Y, Sun G, Li F, Yan H, Zhang L, Li Z.
PMID: 24979417
Appl Opt. 2014 Jun 20;53(18):3875-83. doi: 10.1364/AO.53.003875.

The design method of an infrared/millimeter wave mirror array type of beam combiner was investigated. The beam combiner was composed of a support plate, air gap, and mirror array. It had two advantages: one was that the size of...

Long-period gratings for selective monitoring of loads on a wind turbine blade.

Applied optics

Glavind L, Buggy S, Canning J, Gao S, Cook K, Luo Y, Peng GD, Skipper BF, Kristensen M.
PMID: 24979432
Appl Opt. 2014 Jun 20;53(18):3993-4001. doi: 10.1364/AO.53.003993.

An optical fiber sensor based on long-period gratings (LPG) for selective measurements of flap- and edge-wise bending of a wind turbine blade is presented. Two consecutive LPGs separated by 40 mm interfere to improve resolution and reduce noise in...

Average capacity for optical wireless communication systems over exponentiated Weibull distribution non-Kolmogorov turbulent channels.

Applied optics

Cheng M, Zhang Y, Gao J, Wang F, Zhao F.
PMID: 24979434
Appl Opt. 2014 Jun 20;53(18):4011-7. doi: 10.1364/AO.53.004011.

We model the average channel capacity of optical wireless communication systems for cases of weak to strong turbulence channels, using the exponentiation Weibull distribution model. The joint effects of the beam wander and spread, pointing errors, atmospheric attenuation, and...

Development of a portable deflectometry system for high spatial resolution surface measurements.

Applied optics

Maldonado AV, Su P, Burge JH.
PMID: 24979436
Appl Opt. 2014 Jun 20;53(18):4023-32. doi: 10.1364/AO.53.004023.

The Slope-Measuring Portable Optical Test System (SPOTS) is a new, portable, high-resolution, deflectometry device that achieves mid to high (20 to 1000 cyc/m) spatial frequency optical surface metrology with very little filtering and very little noise. Using a proof...

Measurement and reconstruction of three-dimensional configurations of specimen with tiny scattering based on digital holographic tomography.

Applied optics

Chen X, Zhao J, Wang J, Di J, Wu B, Liu J.
PMID: 24979439
Appl Opt. 2014 Jun 20;53(18):4044-8. doi: 10.1364/AO.53.004044.

Based on digital holographic tomography, a method for measuring the three-dimensional (3D) configuration of a transparent object with tiny scattering is proposed. By rotating a Michelson interferometer around static specimen, a series of the phase change distributions of reconstructed...

Fabrication of channel waveguides in dye-doped polymer films by a beam-processing machine based on photo induced bleaching.

Applied optics

Azari A, Mohajerani E, Abedi Z, Eslami Z.
PMID: 24216576
Appl Opt. 2013 Oct 20;52(30):7228-32. doi: 10.1364/AO.52.007228.

Irreversible changes in the refractive index of a dye-doped polymer film by photo induced bleaching were measured with a Mach-Zehnder interferometer. The decrease in the refractive index of the film for various laser powers and various radiation times has...

Modeling angular-dependent spectral emissivity of snow and ice in the thermal infrared atmospheric window.

Applied optics

Hori M, Aoki T, Tanikawa T, Hachikubo A, Sugiura K, Kuchiki K, Niwano M.
PMID: 24216578
Appl Opt. 2013 Oct 20;52(30):7243-55. doi: 10.1364/AO.52.007243.

A model of angular-dependent emissivity spectra of snow and ice in the 8-14 μm atmospheric window is constructed. Past field research revealed that snow emissivity varies depending on snow grain size and the exitance angle. Thermography images acquired in...

Embedded optical waveguides fabricated in SF10 glass by low-repetition-rate ultrafast laser.

Applied optics

Bai J, Long X, Liu X, Huo G, Zhao W, Stoian R, Hui R, Cheng G.
PMID: 24216582
Appl Opt. 2013 Oct 20;52(30):7288-94. doi: 10.1364/AO.52.007288.

Symmetric embedded waveguides were fabricated in heavy metal oxide SF10 glass using slit-shaped infrared femtosecond laser writing in the low-repetition frequency regime. The impact of the writing parameters on the waveguide formation in the transverse writing scheme was systemically...

Study of the nonuniform behavior of temperature sensitivity in bare and embedded fiber Bragg gratings: experimental results and analysis.

Applied optics

Mahakud R, Kumar J, Prakash O, Dixit SK.
PMID: 24216660
Appl Opt. 2013 Nov 01;52(31):7570-9. doi: 10.1364/AO.52.007570.

This paper presents an experiment and analysis on the factors affecting nonlinear evolution of Bragg wavelength with change in temperature in typical bare and embedded fiber Bragg grating-based (FBG) temperature sensors. The purpose of the study was to find...

Showing 1 to 12 of 50459 entries