Modified double-wedge-plate shearing interferometer for collimation testing

Darlin, J. S.; Sriram, K. V.; Kothiyal, M. P.; Sirohi, R. S.

doi:10.1364/ao.34.002886

Cited by 15 publications

(7 citation statements)

References 5 publications

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“…Therefore, the pair of fringe patterns become parallel to one another along the shearing direction when the beam is collimated. A similar technique of such self-referencing was also used in the double wedge-plate configuration that requires one to orient the two wedge angles exactly opposite from one another 24 , 25 . However, the orientation is susceptible to human error.…”

Section: Resultsmentioning

confidence: 99%

Complete characterization of ultrashort optical pulses with a phase-shifting wedged reversal shearing interferometer

Lam

Chen

2018

Light Sci Appl

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The ability of an interferometer to characterize the spatial information of a light beam is often limited by the temporal profile of the beam, with femtosecond pulse characterization being particularly challenging. In this study, we developed a simple, stable, controllable shearing and vectorial phase-shifting wedged reversal shearing interferometer that is able to characterize all types of coherent and partially coherent light beams. The proposed interferometer consists of only a single beam splitter cube with one wedged entrance face and is insensitive to environmental vibration due to its common path configuration. A near zero-path length difference of the proposed interferometer ensures its operation for ultrashort pulses, providing, for the first time, a simple and stable interferometric tool to fully characterize sub-100 fs laser pulses. All common beam characterization can be carried out with the interferometer, such as the amplitude, phase, polarization, wavelength, and pulse duration. Furthermore, this technique is sensitive to the wavefront tilt and can be used for precise beam alignment. Therefore, this interferometer can be an essential tool for beam characterization, optical imaging, and the testing required for a wide range of applications, including astronomy, biomedicine, ophthalmology, optical testing and imaging systems, and adaptive optics.

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Section: Resultsmentioning

confidence: 99%

Complete characterization of ultrashort optical pulses with a phase-shifting wedged reversal shearing interferometer

Lam

Chen

2018

Light Sci Appl

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“…However, with the use of the present technique, the measurement characteristics (accuracy, precision, resolution, etc.) are several orders better than the collimation testing using a conventional wedge-plate LSI [15,21].…”

Section: Applicationmentioning

confidence: 89%

“…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%

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

2014

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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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“…In the modified dual-field interferometer the minimum Downloaded by [Tufts University] at 06:35 19 November 2014 displacement of the lens which just detects the decollimation was measured to be 0.02mm. T h e corresponding value in the case of the lateral shearing interferometer is 0.04mm [15].…”

Section: Methodsmentioning

confidence: 97%

A phase-conjugate Twyman-Green interferometer with increased sensitivity for laser beam collimation

Darlin

Kothiyal

Sirohi

1998

Journal of Modern Optics

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A Twyman-Green interferometer having a phase-conjugate mirror in one arm and double mirror in another arm is described to measure divergence and to check the collimation of a laser beam. It uses an internally self-pumped phase conjugation in BaTi03 crystal as phase-conjugate mirror. The use of double mirror gives a dual interference field which results in improved sensitivity in collimation testing. The dual-field interferogram is also useful in easily distinguishing between the divergent and convergent nature of the test beam. Measurement results are presented.

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Modified double-wedge-plate shearing interferometer for collimation testing

Abstract: A modified configuration of the double-wedge-plate shearing interferometer for collimation testing is described. Results of the measurements to determine the setting sensitivity with this configuration are presented.

Cited by 15 publications

References 5 publications

Complete characterization of ultrashort optical pulses with a phase-shifting wedged reversal shearing interferometer

Complete characterization of ultrashort optical pulses with a phase-shifting wedged reversal shearing interferometer

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

A phase-conjugate Twyman-Green interferometer with increased sensitivity for laser beam collimation

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