Abstract

A CGH construction of a holographic optical element (HOE) for an optical disk head with spot-size detection by means of superimposing two Fresnel zone plates is studied. Optimum parameter values for the ratio of segment to grating pitch (duty) and grating height are clarified from the viewpoint of total light power efficiency in the round trip optical system. The influences of higher-order diffracted beams near the first-order diffracted beams used to get signals on signal detection are shown to be small. The HOEs with almost optimum parameter values are fabricated and the desired diffracted spots, the expected total light power efficiency, and the small influence of higher-order diffracted beams are observed.

© 1990 Optical Society of America

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References

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  1. Y. Kimura, S. Sugama, Y. Ono, “High Performance Optical Head Using Optimized Holographic Optical Element,” Jpn. J. Appl. Phys. Suppl. 26-4, 131–134 (1987).
  2. K. Tatsumi, T. Matsushita, S. Ito, “A Multi-Functional Reflection Type Gratings for the CD Optical Head,” Jpn. J. Appl. Phys. Suppl. 26-4, 127–130 (1987).
  3. W. H. Lee, “Optical Head Using Hologram Lens for Both Beam Splitting and Focus Error Detection Functions,” U.S. Patent4,731,772 (Mar.1988).
  4. H. Jacobus, “Apparatus for Optically Scanning an Information Plane Wherein a Diffraction Grating Splits the Beam into Sub-beams,” U.S. Patent4,665,310 (May1987).
  5. M. Kato, T. Saimi, S. Kadowaki, Y. Komma, “Holographic Servo-Signal Detection in Optical Heads,” in Technical Digest, Topical Meeting on Optical Data Storage (Optical Society of America, Washington, DC, 1989), pp. 82–85; Proc. Soc. Photo-Opt. Instrum. Eng.1078, 122–126 (1989).
  6. S. Ohara, T. Yoshida, T. Ishida, “Optical Head,” U.S. Patent4,724,533 (June1984).
  7. W. H. Lee, “High Efficiency Multiple Beam Gratings,” Appl. Opt. 18, 2152–2158 (1979).
    [CrossRef] [PubMed]
  8. S. Kadowaki, Y. Komma, Y. Hori, M. Kato, “Integrated Holographic Optical Pickup Head with Wide Allowance Range,” Jpn. J. Appl. Phys. Suppl. 28-3, 189–192 (1989).

1989

S. Kadowaki, Y. Komma, Y. Hori, M. Kato, “Integrated Holographic Optical Pickup Head with Wide Allowance Range,” Jpn. J. Appl. Phys. Suppl. 28-3, 189–192 (1989).

1987

Y. Kimura, S. Sugama, Y. Ono, “High Performance Optical Head Using Optimized Holographic Optical Element,” Jpn. J. Appl. Phys. Suppl. 26-4, 131–134 (1987).

K. Tatsumi, T. Matsushita, S. Ito, “A Multi-Functional Reflection Type Gratings for the CD Optical Head,” Jpn. J. Appl. Phys. Suppl. 26-4, 127–130 (1987).

1979

Hori, Y.

S. Kadowaki, Y. Komma, Y. Hori, M. Kato, “Integrated Holographic Optical Pickup Head with Wide Allowance Range,” Jpn. J. Appl. Phys. Suppl. 28-3, 189–192 (1989).

Ishida, T.

S. Ohara, T. Yoshida, T. Ishida, “Optical Head,” U.S. Patent4,724,533 (June1984).

Ito, S.

K. Tatsumi, T. Matsushita, S. Ito, “A Multi-Functional Reflection Type Gratings for the CD Optical Head,” Jpn. J. Appl. Phys. Suppl. 26-4, 127–130 (1987).

Jacobus, H.

H. Jacobus, “Apparatus for Optically Scanning an Information Plane Wherein a Diffraction Grating Splits the Beam into Sub-beams,” U.S. Patent4,665,310 (May1987).

Kadowaki, S.

S. Kadowaki, Y. Komma, Y. Hori, M. Kato, “Integrated Holographic Optical Pickup Head with Wide Allowance Range,” Jpn. J. Appl. Phys. Suppl. 28-3, 189–192 (1989).

M. Kato, T. Saimi, S. Kadowaki, Y. Komma, “Holographic Servo-Signal Detection in Optical Heads,” in Technical Digest, Topical Meeting on Optical Data Storage (Optical Society of America, Washington, DC, 1989), pp. 82–85; Proc. Soc. Photo-Opt. Instrum. Eng.1078, 122–126 (1989).

Kato, M.

S. Kadowaki, Y. Komma, Y. Hori, M. Kato, “Integrated Holographic Optical Pickup Head with Wide Allowance Range,” Jpn. J. Appl. Phys. Suppl. 28-3, 189–192 (1989).

M. Kato, T. Saimi, S. Kadowaki, Y. Komma, “Holographic Servo-Signal Detection in Optical Heads,” in Technical Digest, Topical Meeting on Optical Data Storage (Optical Society of America, Washington, DC, 1989), pp. 82–85; Proc. Soc. Photo-Opt. Instrum. Eng.1078, 122–126 (1989).

Kimura, Y.

Y. Kimura, S. Sugama, Y. Ono, “High Performance Optical Head Using Optimized Holographic Optical Element,” Jpn. J. Appl. Phys. Suppl. 26-4, 131–134 (1987).

Komma, Y.

S. Kadowaki, Y. Komma, Y. Hori, M. Kato, “Integrated Holographic Optical Pickup Head with Wide Allowance Range,” Jpn. J. Appl. Phys. Suppl. 28-3, 189–192 (1989).

M. Kato, T. Saimi, S. Kadowaki, Y. Komma, “Holographic Servo-Signal Detection in Optical Heads,” in Technical Digest, Topical Meeting on Optical Data Storage (Optical Society of America, Washington, DC, 1989), pp. 82–85; Proc. Soc. Photo-Opt. Instrum. Eng.1078, 122–126 (1989).

Lee, W. H.

W. H. Lee, “High Efficiency Multiple Beam Gratings,” Appl. Opt. 18, 2152–2158 (1979).
[CrossRef] [PubMed]

W. H. Lee, “Optical Head Using Hologram Lens for Both Beam Splitting and Focus Error Detection Functions,” U.S. Patent4,731,772 (Mar.1988).

Matsushita, T.

K. Tatsumi, T. Matsushita, S. Ito, “A Multi-Functional Reflection Type Gratings for the CD Optical Head,” Jpn. J. Appl. Phys. Suppl. 26-4, 127–130 (1987).

Ohara, S.

S. Ohara, T. Yoshida, T. Ishida, “Optical Head,” U.S. Patent4,724,533 (June1984).

Ono, Y.

Y. Kimura, S. Sugama, Y. Ono, “High Performance Optical Head Using Optimized Holographic Optical Element,” Jpn. J. Appl. Phys. Suppl. 26-4, 131–134 (1987).

Saimi, T.

M. Kato, T. Saimi, S. Kadowaki, Y. Komma, “Holographic Servo-Signal Detection in Optical Heads,” in Technical Digest, Topical Meeting on Optical Data Storage (Optical Society of America, Washington, DC, 1989), pp. 82–85; Proc. Soc. Photo-Opt. Instrum. Eng.1078, 122–126 (1989).

Sugama, S.

Y. Kimura, S. Sugama, Y. Ono, “High Performance Optical Head Using Optimized Holographic Optical Element,” Jpn. J. Appl. Phys. Suppl. 26-4, 131–134 (1987).

Tatsumi, K.

K. Tatsumi, T. Matsushita, S. Ito, “A Multi-Functional Reflection Type Gratings for the CD Optical Head,” Jpn. J. Appl. Phys. Suppl. 26-4, 127–130 (1987).

Yoshida, T.

S. Ohara, T. Yoshida, T. Ishida, “Optical Head,” U.S. Patent4,724,533 (June1984).

Appl. Opt.

Jpn. J. Appl. Phys. Suppl.

Y. Kimura, S. Sugama, Y. Ono, “High Performance Optical Head Using Optimized Holographic Optical Element,” Jpn. J. Appl. Phys. Suppl. 26-4, 131–134 (1987).

Jpn. J. Appl. Phys. Suppl.

K. Tatsumi, T. Matsushita, S. Ito, “A Multi-Functional Reflection Type Gratings for the CD Optical Head,” Jpn. J. Appl. Phys. Suppl. 26-4, 127–130 (1987).

S. Kadowaki, Y. Komma, Y. Hori, M. Kato, “Integrated Holographic Optical Pickup Head with Wide Allowance Range,” Jpn. J. Appl. Phys. Suppl. 28-3, 189–192 (1989).

Other

W. H. Lee, “Optical Head Using Hologram Lens for Both Beam Splitting and Focus Error Detection Functions,” U.S. Patent4,731,772 (Mar.1988).

H. Jacobus, “Apparatus for Optically Scanning an Information Plane Wherein a Diffraction Grating Splits the Beam into Sub-beams,” U.S. Patent4,665,310 (May1987).

M. Kato, T. Saimi, S. Kadowaki, Y. Komma, “Holographic Servo-Signal Detection in Optical Heads,” in Technical Digest, Topical Meeting on Optical Data Storage (Optical Society of America, Washington, DC, 1989), pp. 82–85; Proc. Soc. Photo-Opt. Instrum. Eng.1078, 122–126 (1989).

S. Ohara, T. Yoshida, T. Ishida, “Optical Head,” U.S. Patent4,724,533 (June1984).

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Figures (6)

Fig. 1
Fig. 1

Focusing servo optics using a HOE with six-element photodetectors: L1 objective lens; L2, collimating lens PD, photodetector; LD, laser diode; P1,P2, first-order diffracted beam in situation of (a) focus and (b) defocus; FE = (a + cb) − (d + fe).

Fig. 2
Fig. 2

Part of a pattern of the HOE showing the CGH construction of FZPs.

Fig. 3
Fig. 3

Two-dimensional binary function f(x,y) which periodically takes the value of 0 or 1.

Fig. 4
Fig. 4

Fabrication process of the HOE.

Fig. 5
Fig. 5

SEM photograph of an example of a fabricated HOE on a silica plate as a relief type phase hologram through some conventional lithographic process.

Fig. 6
Fig. 6

Picture of diffracted beams from the HOE: η0, the zeroth-order diffracted beam; η0,1, η1,0, the first-order diffracted beams; η−1,2, η2,−1, high-order diffracted beams near η0,1, η1,0. The two spots η−1,1, and η1,−1 adjacent to the zeroth-order diffracted beam may not make noise in the servo signal because they are not near η0,1, or η1,0.

Tables (1)

Tables Icon

Table I Characteristics of the HOE

Equations (9)

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g ( x , y ) = [ 2 f ( x , y ) - 1 ] sin θ + i cos θ ,
θ = 1 2 · 2 π ( n D - 1 ) D λ .
f ( x , y ) = m , n C m n exp [ 2 π i ( m u + n v ) ] ,
u = x / T - y / T · cos Φ ,             v = y / L , C m n = 1 T L s f ( x , y ) exp { - 2 π i [ m ( x / T - y / T · cot Φ ) + n · y / L ] } d x d y = sin ( m π p ) m π · sin ( n π q ) n π ,
a 0 , 1 = 2 p · sin θ q π · sin θ ,
a 1 , 0 = 2 q · sin π p π · sin θ ,
η = η 0 , 0 × ( η 0 , 1 + η 1 , 0 ) ,
η = [ ( 2 p 2 - 1 ) 2 sin 2 θ + cos 2 θ ] · 8 π 2 · sin 2 θ · p 2 · sin 2 π p .
η - 1 , 2 = ( 1 2 π 2 · sin π p · sin 2 π q · sin θ ) 2 .

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