Improved measurement characteristics in collimation testing using Lau interferometry and Fourier fringe analysis technique

Disawal, Reena; Dhanotia, Jitendra; Prakash, Shashi

doi:10.1016/j.precisioneng.2014.06.005

Cited by 16 publications

(7 citation statements)

References 32 publications

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“…More recently, Chang in [27] proposes a collimation testing and calibration using a heterodyne Moir method. This method is fast, relatively simple and achieves a positioning accuracy close to m 7 m. On the other hand, the technique proposed by Disawal is based on Lau effect and achieves collimation of incoherent beams with an accuracy of m 1 m [28]. Talbot interferometry is used suitably modified by Patorsky to prevent the continued displacement of the second grating.…”

Section: Resultsmentioning

confidence: 99%

Dual self-image technique for beam collimation

Herrera-Fernandez

Sanchez‐Brea

Torcal-Milla

et al. 2016

J. Opt.

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Abstract. We propose an accurate technique for obtaining highly collimated beams, which also allows testing the collimation degree of a beam. It is based on comparing the period of two different self-images produced by a single diffraction grating. In this way, variations in the period of the diffraction grating do not affect to the measuring procedure. Self-images are acquired by two CMOS cameras and their periods are determined by fitting the variogram function of the self-images to a cosine function with polynomial envelopes. This way, loss of accuracy caused by imperfections of the measured self-images is avoided. As usual, collimation is obtained by displacing the collimation element with respect to the source along the optical axis. When the period of both self-images coincides, collimation is achieved. With this method neither a strict control of the period of the diffraction grating nor a transverse displacement, required in other techniques, are necessary. As an example, a LED considering paraxial approximation and point source illumination is collimated resulting a resolution in the divergence of the beam of δφ = ±1.57 µrad.

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Section: Resultsmentioning

confidence: 99%

Dual self-image technique for beam collimation

Herrera-Fernandez

Sanchez‐Brea

Torcal-Milla

et al. 2016

J. Opt.

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“…Most of them are based on interferometry [1][2][3][4][5] or on self-imaging techniques [6][7][8][9]. In addition, several techniques have been proposed in the last years [10][11][12][13][14][15]. In particular, several collimation methods based on self-imaging that do not need a lateral displacement of the grating have been proposed, being these devices simple an stable.…”

Section: Q3mentioning

confidence: 99%

Lissajous figure-based single-frame collimation technique

Torcal-Milla

Sanchez‐Brea

Herrera-Fernandez

2015

Sensors and Actuators A: Physical

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“…Errors in beam collimation may result in severe degradation of system performance. Automated interferogramanalysis-based techniques have been incorporated to improve the measurement characteristics [17][18][19][20][21]. The use of these techniques has increased the performance of the collimation test substantially.…”

Section: Applicationmentioning

confidence: 99%

“…They claimed the value of Δf to be 7 μm. Recently, we reported collimation testing [20] in Lau interferometry using Fourier-fringe analysis with a reported resolution of 1 μm. By using the present technique, the resolution in measurement, Δf , was found to be 10 μm for the collimating lens with 250 mm focal length and 50 mm diameter.…”

Section: Applicationmentioning

confidence: 99%

Phase-shifting lateral shearing interferometry using wedge-plate and interferometric grating

2014

Self Cite

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A simple and robust method for introducing a phase-shifting test procedure in a wedge-plate shearing interferometer is proposed. The output of the wedge-plate lateral shearing interferometer (LSI) is superposed onto a sinusoidal grating, forming a moiré pattern. The in-plane translation of grating perpendicular to the grating lines is used for introducing a known amount of phase shifts in the interferometer. Direct measurement of phase using a four-step phase-shifting method is undertaken. The applicability of this devised phase-shifting wedge-plate LSI has been successfully tested for setting the collimation position of optical beams. Good accuracy and precision are achieved.

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Improved measurement characteristics in collimation testing using Lau interferometry and Fourier fringe analysis technique

Cited by 16 publications

References 32 publications

Dual self-image technique for beam collimation

Dual self-image technique for beam collimation

Lissajous figure-based single-frame collimation technique

Phase-shifting lateral shearing interferometry using wedge-plate and interferometric grating

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