Wedge-plate shearing interferometers for collimation testing: use of a moiré technique

J. Choi; Gerard M. Perera; M. D. Aggarwal; R. P. Shukla; M. V. Mantravadi

doi:10.1364/AO.34.003628

Applied Optics
Vol. 34,
Issue 19,
pp. 3628-3638
(1995)
•https://doi.org/10.1364/AO.34.003628

Wedge-plate shearing interferometers for collimation testing: use of a moiré technique

J. Choi, Gerard M. Perera, M. D. Aggarwal, R. P. Shukla, and M. V. Mantravadi

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J. Choi, Gerard M. Perera, M. D. Aggarwal, R. P. Shukla, and M. V. Mantravadi, "Wedge-plate shearing interferometers for collimation testing: use of a moiré technique," Appl. Opt. 34, 3628-3638 (1995)

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Abstract

Various optical arrangements of a double-wedge-plate shearing interferometer are presented for checking laser beam collimation. The use of moiré fringes is found to be advantageous for setting the shear fringes parallel to the direction of shear in order to obtain a well-collimated laser beam. The experimental procedure and various details of the interferometer are discussed. A brief summary of a few methods for collimation testing that use a wedge plate is also given. The accuracies achievable with shearing interferometers that use a parallel plate, a wedge plate of small angle, a double wedge having a large wedge angle, a wedge plate of large angle along with two flat mirrors, and a wedge plate having a large angle are compared and summarized.

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Optical Components of the Lateral Shearing Interferometer	Method of Checking Laser Beam Collimation	Uncertainty in Collimation Measured as Defocusing (δl)
1. Parallel plate	A fringe of uniform brightness is set in the shearing interference pattern	3.4 µm from Eq. (15)
2. Wedge plate of small angle	Interference fringes are set parallel to a horizontal reference mark	0.34 µm from Eq. (14)
3. Double-wedge plates of large angle (optical arrangement shown in Fig. 1)	A moiré fringe of uniform brightness is set in the field of view where d₁ = d₂	1.7 µm from Eq. (10)
4. Double-wedge plates of large angle (optical of large angle in Fig. 1)	moiré fringes are set parallel to the horizontal direction where d₁ ≠ d	0.16 µm from Eq. (12)
5. Wedge plate of large angle and two flat mirrors (optical arrangement shown in Fig. 5)	A moiré fringe of uniform brightness is set in the field of view where d₁ = d₂	1.7 µm from Eq. (10)
6. Wedge plate of large angle with ronchi grating (optical arrangement shown in Fig. 6)	A moiré fringe of uniform brightness is set in the field of view where d = p	3.4 µm from Eq. (9)
7. Wedge plate of large angle with ronchi grating (optical arrangement shown in Fig. 6)	Moiré fringes are set parallel to the horizontal direction where d ≠ p	0.33 µm from Eq. (11)

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Applied Optics