Results 241 to 250 of about 1,184,066 (286)
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Applied Optics, 2005
The concept of femtosecond laser speckles is put forward. The theory of a speckle pattern in light of finite bandwidth is applied to describe femtosecond laser speckles. Basic representations of the contrast and the spectral correlation of femtosecond laser speckles are presented.
Wenjun, Liu, Changhe, Zhou
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The concept of femtosecond laser speckles is put forward. The theory of a speckle pattern in light of finite bandwidth is applied to describe femtosecond laser speckles. Basic representations of the contrast and the spectral correlation of femtosecond laser speckles are presented.
Wenjun, Liu, Changhe, Zhou
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Laser speckle projection tomography
Optics Letters, 2013We propose a laser speckle projection tomography (LSPT) method to obtain a three-dimensional (3D) flowing image. The method combines the advantages of optical projection tomography and laser speckle imaging to reconstruct the visualization of 3D flowing structure.
Guanping, Feng +4 more
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Applied Optics, 1989
A new rotary encoder is proposed which detects displacement of speckle arising in the diffraction field of a cylinder illuminated by a narrow laser beam. The displacement is detected from the peak position of the cross-correlation between the outputs of a linear image sensor.
I, Yamaguchi, T, Fujita
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A new rotary encoder is proposed which detects displacement of speckle arising in the diffraction field of a cylinder illuminated by a narrow laser beam. The displacement is detected from the peak position of the cross-correlation between the outputs of a linear image sensor.
I, Yamaguchi, T, Fujita
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Polarization microstatistics of laser speckle
Physical Review A, 1992The microstatistics of laser speckle has been investigated under varying incident polarization angle θ. The intensity at each point in a speckle pattern varies sinusoidally with θ and can be described completely by three parameters: amplitude, baseline, and relative phase.
, Tarhan, , Watson
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Optimizing the parameters for measuring laser speckle and speckle contrast
Applied Optics, 2014Evaluating the contrast in speckle patterns produced by laser projection displays can facilitate the development of methods to suppress such imperfection. Computer simulations were first conducted to characterize the contrast (C(gs)) of fully developed speckle patterns with spatial factor k and power factor r.
Wei-Feng, Hsu, Min-Chun, Chou
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Impact of velocity distribution assumption on simplified laser speckle imaging equation [PDF]
Optics Express, 2008 Since blood flow is tightly coupled to the health status of biological tissue, several instruments have been developed to monitor blood flow and perfusion dynamics. One such instrument is laser speckle imaging.
Bernard Choi +2 more
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Simple diffuser for production of laser speckle
Applied Optics, 1989A passive optical element that is a simple, inexpensive, and effective way for producing laser speckle is described. The optical element, a random phase plate, was developed in our laboratory. The statistics of the speckle pattern it produces were measured and are discussed in this paper. The phase plate was used to produce a speckled beam using a 5-mW
K D, Bonin, M A, Kadar-Kallen
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Real-time laser speckle photography
Applied Optics, 1984Une figure de speckle de reference est produite en prenant un hologramme a une seule exposition de l ...
F P, Chiang, Q B, Li
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Laser eye safety: the implications of ordinary speckle statistics and of speckled-speckle statistics
Journal of the Optical Society of America, 1981The implications of speckle statistics on laser eye-safety considerations are evaluated. The concept of speckled speckle is introduced, and its statistics are shown to correspond to the K0 function. Speckled speckle is defined in terms of the retinal power density when the eye is viewing an optically rough surface that is illuminated by a laser beam ...
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1983
In the infrared, visible and ultraviolet region, there are three main kinds of sources : thermal sources which radiate at virtually all wavelengths (e.g. solid hot bodies and hot gases under high pressure), thermal sources giving line spectra (gase discharge tubes under low pressure), lasers.
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In the infrared, visible and ultraviolet region, there are three main kinds of sources : thermal sources which radiate at virtually all wavelengths (e.g. solid hot bodies and hot gases under high pressure), thermal sources giving line spectra (gase discharge tubes under low pressure), lasers.
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