Abstract

A new type of acousto-optic device based on a LiTaO3 crystal is presented. A harmonic voltage with a proper frequency applied to the piezoelectric LiTaO3 crystal generates mechanical oscillations in the material. Due to photoelasticity, an artificial modulated birefringence is induced by this oscillation. By using a properly adjusted polarizer and analyzer, the transmission of trough-going polarized light can be modulated. By simultaneous excitation of two modes, an advanced optical response can be achieved. For the applications presented here, the first shear eigenmode must have exactly three times the frequency of the first longitudinal eigenmode.

© 2008 Optical Society of America

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References

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  1. J. C. Kemp, “Piezo-optical birefringence modulators: new use for a long-known effect,” J. Opt. Soc. Am. 59, 950-955 (1969).
  2. J. C. Kemp, “Hinds Instruments,” www.hindsinstruments.com.
  3. F. Bammer, B. Holzinger, and T. Schumi, “A single crystal photo-elastic modulator,” Proc. SPIE 6469, 64690O (2007).
    [CrossRef]
  4. F. Bammer and R. Petkovsek, “Q-switching of a fiber laser with a single crystal photo-elastic modulator,” Opt. Express 15, 6177-6182 (2007).
    [CrossRef] [PubMed]
  5. F. J. Nye, Physical Properties of Crystals (Oxford Science, 1984), Chap. 14 .
  6. K. K. Wong, ed., Properties of Lithium Niobate (INSPEC, Institution of Electrical Engineers, London, 2002), Chap. 8.
  7. F. Bammer, B. Holzinger, and T. Schumi, “Time multiplexing of high power laser diodes with single crystal photo-elastic modulators,” Opt. Express 14, 3324-3332 (2006).
    [CrossRef] [PubMed]
  8. T. A. Maldonado and M. Bass, Handbook of Optics (McGraw-Hill, 1995).

2007 (2)

F. Bammer, B. Holzinger, and T. Schumi, “A single crystal photo-elastic modulator,” Proc. SPIE 6469, 64690O (2007).
[CrossRef]

F. Bammer and R. Petkovsek, “Q-switching of a fiber laser with a single crystal photo-elastic modulator,” Opt. Express 15, 6177-6182 (2007).
[CrossRef] [PubMed]

2006 (1)

1969 (1)

Bammer, F.

Bass, M.

T. A. Maldonado and M. Bass, Handbook of Optics (McGraw-Hill, 1995).

Holzinger, B.

Kemp, J. C.

Maldonado, T. A.

T. A. Maldonado and M. Bass, Handbook of Optics (McGraw-Hill, 1995).

Nye, F. J.

F. J. Nye, Physical Properties of Crystals (Oxford Science, 1984), Chap. 14 .

Petkovsek, R.

Schumi, T.

J. Opt. Soc. Am. (1)

Opt. Express (2)

Proc. SPIE (1)

F. Bammer, B. Holzinger, and T. Schumi, “A single crystal photo-elastic modulator,” Proc. SPIE 6469, 64690O (2007).
[CrossRef]

Other (4)

F. J. Nye, Physical Properties of Crystals (Oxford Science, 1984), Chap. 14 .

K. K. Wong, ed., Properties of Lithium Niobate (INSPEC, Institution of Electrical Engineers, London, 2002), Chap. 8.

T. A. Maldonado and M. Bass, Handbook of Optics (McGraw-Hill, 1995).

J. C. Kemp, “Hinds Instruments,” www.hindsinstruments.com.

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Figures (7)

Fig. 1
Fig. 1

SCPEM made of a 3m crystal

Fig. 2
Fig. 2

Behavior of a piezoelectric crystal at resonance with frequency f 1 as can be obtained from theory. Amplitude and phase (in reference to the excitation voltage) of deformation (left) and current (right).

Fig. 3
Fig. 3

Typical time-dependent retardation (dashed curve) and resulting transmission of a SCPEM polarizer configuration (solid curve) as obtained by inserting Eq. (3) into Eq. (4).

Fig. 4
Fig. 4

Adding a third harmonic to the retardation: typical time-dependent retardation (dashed curve) and resulting transmission of a SCPEM polarizer configuration (solid curve) as obtained by inserting Eq. (5) into Eq. (4).

Fig. 5
Fig. 5

Measurement of the time-dependent transmission of a DMSCPEM (lower graph). The transmission peak frequency is 254 kHz . The upper graph shows the current flowing through the crystal.

Fig. 6
Fig. 6

Setup of a fiber laser with a SCPEM Q switch. Two photodetectors are used simultaneously to detect both the transmittance of the SCPEM and the output pulses of the laser.

Fig. 7
Fig. 7

(a)  127 kHz pulse sequence of the fiber-laser–DMSCPEM combination sketched in Fig. 6. (b) An output pulse for single-mode and dual-mode operations of the SCPEM Q switch.

Equations (7)

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δ = L ( n 1 n 2 ) = L Δ n ,
Δ n = n o 3 2 [ ( p 12 E p 11 E ) ( ϵ 1 ϵ 2 ) 2 p 14 E ϵ 4 ] .
δ = A sin ω 1 t ,
T ( δ ) = cos 2 ( π λ δ ) .
δ = A 1 sin ω 3 3 t + A 1 3 sin ω 3 t with     A 1 = λ 2 4 π .
U ( t ) = U 1 sin ( ω 3 3 t + γ ) .
δ L ( t ) = 2 λ HN λ L δ HN ( t ) .

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