Pulsed digital holographic interferometry with 694- and 347-nm wavelengths

Pedrini, Giancarlo; Tiziani, Hans J.; Gusev, Mikhail E.

doi:10.1364/ao.39.000246

Cited by 19 publications

(11 citation statements)

References 2 publications

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“…22 Through beam splitter BS1 both beams originating from tunable diode lasers 1 and 2 are spatially superimposed and propagate along the same direction. The reference beam passes through the spatial filter (SF), is partially reflected by beam splitter BS2 and illuminates the CCD.…”

Section: Optical Scheme Of the Wavefront Sensormentioning

confidence: 99%

Simple and versatile heterodyne whole-field interferometer for phase optics characterization

Silva

Barbosa

Wetter

2012

Review of Scientific Instruments

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A wavefront sensor for thermally induced lens and passive lens characterization based on lowcoherence digital speckle interferometry was developed and studied. By illuminating the optical setup with two slightly detuned red diode lasers, whole-field contour interference fringes were generated according to the resulting synthetic wavelength. For fringe pattern visualization the optical setup used the light transmitted through a ground glass plate as object beam. The performance of the sensor was investigated and its versatility was demonstrated by measuring the thermal lens induced in an Er-doped glass sample pumped by a 1.76-W diode laser emitting at 976 nm and by evaluating the wavefront distortion introduced by an ophthalmic progressive lens.

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Section: Optical Scheme Of the Wavefront Sensormentioning

confidence: 99%

Simple and versatile heterodyne whole-field interferometer for phase optics characterization

Silva

Barbosa

Wetter

2012

Review of Scientific Instruments

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“…CCD has been popularly used in pulsed digital holography because of its high sensitivity and convenient interface with computers [1][2][3][4][5][6] . To record an ultra-fast event with an expose frequency higher than the frame frequency of a CCD, multiplexing technique has to be employed to record subholograms at different times on a single frame of CCD, and each sub-hologram can be reconstructed through Fourier transformation and digital filtering, as reported in the previous work focused on SADM (spatial angular division multiplexing) [7,8] and SDM (spatial division multiplexing) [9] .…”

Section: Doimentioning

confidence: 99%

Pulsed digital micro-holography of femto-second order by double-wavelength recording

Wang

Zhai

2007

Optoelectron. Lett.

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Double-wavelength recording used in a pulsed digital micro-holographic system to record ultra-fast processing of the order of femto-second is reported for the first time, where a BBO crystal is used to generate harmonic wave of the incident laser wave, and both of the basic and the frequency doubled waves are time-delayed and introduced to a Michelson's interferometer to record two sub-holograms with different spatial frequencies on a single frame of a CCD. In the experiment, an ultrafast dynamic process of air ionization induced by a single femto-second laser pulse is recorded with holography by this system, and both of intensity and phase difference images digitally reconstructed are obtained through Fourier transformation and digital filtering, which show clearly the dynamic process of formation and propagation of the plasma, with a time resolution of the order of femto-second. CLC number: 0438.1 Document code: A Article ID: 1673-1905(2007)02-0133-03 DOIPulsed holography technique is a powerful tool for recording dynamics of ultra-fast events during the pulse duration of the pulsed laser beam, and the dynamic process of the events can be reconstructed in amplitude and phase simultaneously, where high sensitivity and fast response of the recording medium is required.CCD has been popularly used in pulsed digital holography because of its high sensitivity and convenient interface with computers [1][2][3][4][5][6] . To record an ultra-fast event with an expose frequency higher than the frame frequency of a CCD, multiplexing technique has to be employed to record subholograms at different times on a single frame of CCD, and each sub-hologram can be reconstructed through Fourier transformation and digital filtering, as reported in the previous work focused on SADM (spatial angular division multiplexing) [7,8] and SDM (spatial division multiplexing) [9] . In reference[7], a specially designed cavity is used to generate sub-pulses for object and reference beams, by which the frame interval of the recording is limited to the picosecond order, restricted by the incompressible size of the cavity. In reference[9], an on axis digital holographic system with spatial division multiplexing for recording ultra-fast event in the pico-second order is reported, of which the experimental difficulty, however, is to spatially distribute the sub-holograms in a small target area of a CCD without any overlapping. Besides, it is noticed that in both of the systems described above, the recorded view angle of the event can not be kept the same. Pulsed digital holography recording ultra-fast event of the femto-second order with the same view angle using SADM has been reported in reference[8] recently. It should be noticed, however, that the recorded numbers of sub-holograms based on the change of the incident angles of the reference beams in ADM, or even in SADM, will always be restricted by the sampling law, due to the incompressible pixel size of CCD.In this paper, as an alternative of SADM, a pulsed digital holography system with DWR (d...

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“…The object was simultaneously illuminated by two lasers with different wavelengths, and a sequence of digital holograms was captured by a CCD camera. For each instant, two wrapped phase maps were reconstructed from one digital hologram [30,31]. A new phase distribution with a synthetic wavelength was then obtained by subtracting these two wrapped phase maps.…”

Section: Introductionmentioning

confidence: 99%

Dual-wavelength image-plane digital holography for dynamic measurement

Pedrini

Hennelly

et al. 2009

Optics and Lasers in Engineering

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a b s t r a c tA dual-wavelength image-plane digital holography, combined with a windowed Fourier analysis, is presented for dynamic measurement of a vibrating object. In order to expand the range of the velocity measurement, the object is simultaneously illuminated by two lasers with different wavelengths. A sequence of digital holograms of a vibrating object is captured by a CCD camera and two wrapped phase maps are retrieved from each digital hologram. At each instant, a new phase distribution with a synthetic wavelength is obtained by subtracting these two wrapped phase maps. A windowed Fourier analysis is then applied spatially and temporally to retrieve the high-precision displacement and velocity of the tested object. Experimental results show the requirement on the camera capture frequency is reduced by the proposed method.

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Pulsed digital holographic interferometry with 694- and 347-nm wavelengths

Cited by 19 publications

References 2 publications

Simple and versatile heterodyne whole-field interferometer for phase optics characterization

Simple and versatile heterodyne whole-field interferometer for phase optics characterization

Pulsed digital micro-holography of femto-second order by double-wavelength recording

Dual-wavelength image-plane digital holography for dynamic measurement

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