Speckle reduction in pulsed-laser photographs

Kohler, D.; Seitz, W.L.; Loree, Thomas R.; Gardner, Samual Dean

doi:10.1016/0030-4018(74)90065-0

Cited by 18 publications

(5 citation statements)

References 22 publications

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“…5), given by Eqs. (26) and (27), is correct only for small D (D < T 0 ) when only one of the peaks of the autocorrelation function is inside the central Qx maximum.…”

Section: Simulation Results In the Approximation Of An Ideal Optical mentioning

confidence: 97%

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Full speckle suppression in laser projectors using two Barker code-type diffractive optical elements

et al. 2012

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The mathematical model of a speckle-suppression method based on two Barker code-type diffractive optical elements (DOEs) moving in orthogonal directions is developed. The analytic formulae for speckle suppression efficiency are obtained. The model indicates that the one pair of DOEs can be used for laser beams of different colors. The speckle contrast is not dependent on the distance from the viewer to the screen until the distance decreases below the distance where the spatial resolution of the eye on the screen is less than the length of the image of the DOE structure period on the screen. The analysis of the simulated results demonstrates that the method can decrease the speckle contrast to less than 5%, which is below human eye sensitivity, with an optical efficiency greater than 90%.

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“…5), given by Eqs. (26) and (27), is correct only for small D (D < T 0 ) when only one of the peaks of the autocorrelation function is inside the central Qx maximum.…”

Section: Simulation Results In the Approximation Of An Ideal Optical mentioning

confidence: 97%

“…In recent years, several novel methods of speckle suppression have been developed based on a light pipe tube [27,28]. The effect of speckle suppression (using the angle diversity of the illumination system) in this method is obtained by vibration or rotation of the pipe tube.…”

Section: Introductionmentioning

confidence: 99%

Full speckle suppression in laser projectors using two Barker code-type diffractive optical elements

et al. 2012

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“…The pulse first propagates through a carbon disulfide (CS 2 ) cell to induce spectral broadening and thus reduce the effect of laser speckle, greatly improving image quality. 5 The illuminating pulse then propagates through a grid that is imaged onto the surface of the flyer plate using a pair of achromatic lenses. Charge coupled device ͑CCD͒ cameras are mounted at 20°with respect to the flyer propagation axis, in one of two arrangements.…”

Section: Apparatusmentioning

confidence: 99%

“…It is possible to counteract this effect by broadening the spectrum of the laser pulse through self-phase modulation. 5 For this purpose a 30 cm long carbon disulfide cell is placed in the beam path and is triple passed using two mirrors. The net effect of this process is seen in Fig.…”

Section: Apparatusmentioning

confidence: 99%

Stereo camera system for three-dimensional reconstruction of a flyer plate in flight

Rupp

Gehr

Bucholtz

et al. 2003

Review of Scientific Instruments

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“…One of the methods of lowering the spatial coherency of pulse laser radiation is based on the phenomenon of the phase self-modulation in nonlinear medium [1].…”

Section: Introductionmentioning

confidence: 99%

<title>Transformation of coherent and angular characteristics of pulse radiation at self-modulation in non-homogeneous multi-mode waveguides</title>

Kitsak

2006

SPIE Proceedings

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There has been offered a method oftransformation of spatial coherency of pulse laser radiation based on the phase self-modulation in multi-mode waveguide. We have conducted analysis of the peculiarities of the transfer of correlation properties of the radiation in gradient waveguide with regular and non-regular cores refraction index profile distribution. We have also conducted a comparative analysis of the global coherency degree parameter of the radiation at the end of non-homogeneous waveguide and non-waveguide media. We show that the most effective mechanism of decorrelation of pulse radiation in the waveguide is the fluctuations of radiation phase scattered on the heterogeneousness of the waveguide's core refraction index; the fluctuations being induced at non-linear interaction ofthe radiation with spatially non-uniform intensity distribution.

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Speckle reduction in pulsed-laser photographs

Cited by 18 publications

References 22 publications

Full speckle suppression in laser projectors using two Barker code-type diffractive optical elements

Full speckle suppression in laser projectors using two Barker code-type diffractive optical elements

Stereo camera system for three-dimensional reconstruction of a flyer plate in flight

<title>Transformation of coherent and angular characteristics of pulse radiation at self-modulation in non-homogeneous multi-mode waveguides</title>

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