Abstract

An off-perpendicular incident arrangement is suggested and tested in AOTF system design to improve the spectrum resolution and angular aperture. A special discussion is given to the “equivalent point design” of Si=56° where the optimum design parameters are reached.

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References

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  1. R. W. Dixon, IEEE. J. Quantum Electron. QE-3, 85 (1967).
    [CrossRef]
  2. I. C. Chang, Appl. Phys. Lett. 25, 370 (1974).
    [CrossRef]
  3. T. Yano and A. Watanabe, Appl. Opt. 15, 2250 (1976).
    [CrossRef] [PubMed]
  4. Mo Fuqin, Acta Optica Sinica, 6, 446 (1986).
  5. V. M. Epikhin, F. L. Vizen and L. L. Paltsev, Sov. Phys. Tech. Phys. 32, 1149 (1987).
  6. B. Xue, K. Xu and H. Yamamoto, Opt. Express 4, 139 (1999); http://www.opticsexpress.org/oearchive/source/8525.htm
    [CrossRef] [PubMed]

Other

R. W. Dixon, IEEE. J. Quantum Electron. QE-3, 85 (1967).
[CrossRef]

I. C. Chang, Appl. Phys. Lett. 25, 370 (1974).
[CrossRef]

T. Yano and A. Watanabe, Appl. Opt. 15, 2250 (1976).
[CrossRef] [PubMed]

Mo Fuqin, Acta Optica Sinica, 6, 446 (1986).

V. M. Epikhin, F. L. Vizen and L. L. Paltsev, Sov. Phys. Tech. Phys. 32, 1149 (1987).

B. Xue, K. Xu and H. Yamamoto, Opt. Express 4, 139 (1999); http://www.opticsexpress.org/oearchive/source/8525.htm
[CrossRef] [PubMed]

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Figures (7)

Fig. 1.
Fig. 1.

Beam unevenly narrowed after going through a boundary

Fig. 2.
Fig. 2.

Vector diagram of acouctic-optic reaction

Fig. 3.
Fig. 3.

Cone angle narrowed inside crystal via the off-perpendicular angle with θs=55°.

Fig. 4.
Fig. 4.

Beam with cone angle of 6° narrowed inside the crystal via off-perpendicular angle.

Fig. 5.
Fig. 5.

Crystal diagram (left) and vector diagram (right) of the normal design. Vp and Vg _ the acoustic phase velocity and group velocity.

Fig. 6.
Fig. 6.

Crystal diagram (left) and vector diagram (right) of the improved design. Vp and Vg _ the acoustic phase velocity and group velocity.

Fig. 7.
Fig. 7.

The position differences of the equivalent point via incident surface orientation angle. The differences are compared between acoustic frequency with different optic wavelengths (curve “*” and “+”) And between the acoustic frequency and the acoustic phase match angle (curve “-”).

Equations (6)

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sin ( θ io θ s ) cos 2 θ io ( 1 δ ) 2 n o 2 + sin 2 θ i0 n o 2 sin θ 1 = 0
sin ( θ ie θ s ) cos 2 θ ie ( 1 + δ ) 2 n o 2 + sin 2 θ ie n e 2 sin θ 1 = 0
tan [ θ aeo θ i λ ] = n ie ( θ i , λ ) sin θ i n do ( θ i , λ ) sin [ θ do ( θ i , λ ) ] n ie ( θ i , λ ) cos θ i n do ( θ i , λ ) cos [ θ do ( θ do θ i , λ ) ]
f aeo ( θ i , λ ) = V a λ o [ n ie 2 ( θ i , λ ) + n do 2 ( θ i , λ ) 2 n ie ( θ i , λ ) n do ( θ i , λ ) cos ( θ do ( θ i , λ ) θ i ) ] 1 2
tan [ θ aoe ( θ i , λ ) ] = n io ( θ i , λ ) sin θ i n de ( θ i , λ ) sin [ θ de ( θ i , λ ) ] n io ( θ i , λ ) cos θ i n de ( θ i , λ ) cos [ θ de ( θ i , λ ) ]
f aoe ( θ i , λ ) = V a λ 0 [ n io 2 ( θ i , λ ) + n de 2 ( θ i , λ ) 2 n io ( θ i , λ ) n de ( θ i , λ ) cos ( θ de ( θ i , λ ) θ i ) ] 1 2

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