Design of combined pick-up optical heads

Evgeniy G. Ezhov

doi:10.1364/AO.45.008040

Applied Optics
Vol. 45,
Issue 31,
pp. 8040-8043
(2006)
•https://doi.org/10.1364/AO.45.008040

Design of combined pick-up optical heads

Evgeniy G. Ezhov

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Evgeniy G. Ezhov, "Design of combined pick-up optical heads," Appl. Opt. 45, 8040-8043 (2006)

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Abstract

A pseudoray method is suggested for the initial design for the composition of combined optical CD–DVD read–write heads. The effectiveness of the method is shown in the design of the optical system for the CD–DVD read–write heads.

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Format	NA′	Angular Field 2ω (deg.)	Wavelength λ (μm)	Cover Layer Thickness d _D (mm)	Cover Layer Material
CD	0.51	1.4	0.78	1.2	Polycarbonate
DVD	0.65		0.65	0.6

Surface	c (mm⁻¹)	$\frac{d_{λ 1}}{d_{λ 2}}$ (mm)	$\frac{n_{λ 1}}{n_{λ 2}}$	α₂ × 10² (mm⁻³)	α₃ × 10³ (mm⁻⁵)
1^b	0	0.025
2	0.45	2.5	$\frac{1.5735}{1.5803}$	−2.3175	−6.6246
3	−0.45	$\frac{0.5}{0.8923}$		5.1133	−72.4683
4	0	$\frac{1.2}{0.6}$	$\frac{1.5735}{1.5803}$
5	0	0

	Values of Multinomial Coefficients with Numbers 4, . . . , 8
Coefficient	4	5	6	7	8
A	0.3882 mm⁻⁸	8.2442 mm⁻¹⁰	−20.5994 mm⁻¹²	13.2459 mm⁻¹⁴	−2.4149 mm⁻¹⁶
α⁽¹⁾ × 10⁴	−29.8654 mm⁻⁷	63.9659 mm⁻⁹	−108.5606 mm⁻¹¹	62.2402 mm⁻¹³	−11.3781 mm⁻¹⁵
α⁽²⁾ × 10⁴	640.1944 mm⁻⁷	−312.9005 mm⁻⁹	84.1782 mm⁻¹¹	−11.4546 mm⁻¹³	0.5976 mm⁻¹⁵

Format	NA′	Angular Field 2ω (deg.)	Wavelength λ (μm)	Cover Layer Thickness d _D (mm)	Cover Layer Material
CD	0.51	1.4	0.78	1.2	Polycarbonate
DVD	0.65		0.65	0.6

Surface	c (mm⁻¹)	$\frac{d_{λ 1}}{d_{λ 2}}$ (mm)	$\frac{n_{λ 1}}{n_{λ 2}}$	α₂ × 10² (mm⁻³)	α₃ × 10³ (mm⁻⁵)
1^b	0	0.025
2	0.45	2.5	$\frac{1.5735}{1.5803}$	−2.3175	−6.6246
3	−0.45	$\frac{0.5}{0.8923}$		5.1133	−72.4683
4	0	$\frac{1.2}{0.6}$	$\frac{1.5735}{1.5803}$
5	0	0

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Applied Optics