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Review of Scientific Instruments / Volume 79 / Issue 3 / OPTICS; ATOMS AND MOLECULES; SPECTROSCOPY; PHOTON DETECTORS

Rev. Sci. Instrum. 79, 033104 (2008); http://dx.doi.org/10.1063/1.2894210 (5 pages)

Design of a double-pass shear mode acousto-optic modulator

Chih-Hao Chang1, R. K. Heilmann1, M. L. Schattenburg1, and P. Glenn2

1Space Nanotechnology Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2Bauer Associates, Inc., 8 Tech Circle, Natick, Massachusetts 01760, USA

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(Received 26 November 2007; accepted 16 February 2008; published online 12 March 2008)

The design of a compact double-pass shear mode acousto-optic modulator for high power operation in the UV is presented. Using a spherical mirror retroreflector in the second pass to correct for beam deflection, changes in beam position and angle during frequency tuning can be eliminated. The use of the shear mode acousto-optic interaction offers several key advantages, but the strain-induced birefringence creates significant levels of spectral leakage in the system. These effects and the polarization of the beams are analyzed to minimize leakage. Using a heterodyne interferometry scheme, two double-pass acousto-optic modulators with offset acoustic frequency inputs are set up to measure the leakage intensity. The designed double-pass shear mode acousto-optic modulator was tested with λ = 351.1 nm and demonstrated a peak double-pass efficiency of 42.6% and a bandwidth of 28 MHz. Over this bandwidth the spectral leakage was reduced to ∼ 0.01%–0.04% relative intensity.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. POLARIZATION EFFECTS IN SHEAR MODE ACOUSTO-OPTIC INTERACTION
  3. DOUBLE-PASS CONFIGURATION
  4. SPECTRAL LEAKAGE
  5. CONCLUSION

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KEYWORDS and PACS

Keywords

acousto-optical modulation, birefringence, mirrors, optical design techniques

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2894210

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    S. E. Harris, S. T. K. Nieh, and D. K. Winslow, Appl. Phys. Lett. 15, 325 (1969)APPLAB000015000010000325000001.

    E. A. Donley, T. P. Heavner, F. Levi, M. O. Tataw, and S. R. Jefferts, Rev. Sci. Instrum. 76, 063112 (2005)RSINAK000076000006063112000001.


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