Plotting errors measurement of CGH using an improved interferometric method

Akira Ono; James C. Wyant

doi:10.1364/AO.23.003905

Applied Optics
Vol. 23,
Issue 21,
pp. 3905-3910
(1984)
•https://doi.org/10.1364/AO.23.003905

Plotting errors measurement of CGH using an improved interferometric method

Akira Ono and James C. Wyant

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Akira Ono and James C. Wyant, "Plotting errors measurement of CGH using an improved interferometric method," Appl. Opt. 23, 3905-3910 (1984)

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Abstract

An improved interferometric method is described for measuring plotting errors of desk-top computer plotters used to make computer-generated holograms. The plotting errors are measured using moiré fringes formed using Young’s fringes and straight lines drawn by the plotters. The Young’s fringes are produced by laser beams originating from two single-mode optical fibers. Using this method, plotting errors of Hewlett-Packard 7225A and 7470A plotters are measured.

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Interferogram number	CGH was drawn by	CGH lines are parallel to	Interference fringes are
(a)	7225A	Y axis	Parallel to CGH lines
Fig. 7 (b)		X
(c)	7470A	Y
(d)		X
(a)	7225A	Y	Perpendicular to CGH lines
Fig. 8 (b)		X
(c)	7470A	Y
(d)		X

Interferogram number (Fig. 7)	Maximum distortion fringes (δ_max/Pf)	Straightness of CGH lines (ɛ_max)
(a)	0.16 fringe	0.03 mm
(b)	<0.1	<0.02
(c)	0.25	0.05
(d)	0.32	0.06

Interferogram number (Fig. 7)	Scale	Mean spacing of fringes (Pf) (mm)	Difference of deviation for 150 mm (D) (mm)
(a)	7225A	35	—
	X axis
(b)	7225A	33	0.05/150
	Y axis
(c)	7470A	15	1.14/150
	X axis
(d)	7470A	30	0.14/150
	Y axis

Interferogram number (Fig. 8)	Fringe distortion (δ_max/P_f)	CGH line distortion ɛ_max (mm)
(a)	0.17	0.034
(b)	0.18	0.036
(c)	0.40	0.080
(d)	0.27	0.054

Interferogram number (Fig. 8)	Fringe	slope	Line space fluctuation ΔP_c (μm)

	θ_max	θ_min
(a)	0	−0.003	0.7
(b)	0	−0.009	2.2
(c)	0.01	−0.014	5.8
(d)	0.01	−0.009	4.6

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Applied Optics