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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 2 — Jan. 17, 2011
  • pp: 1174–1182

Coded excitation for photoacoustic imaging using a high-speed diode laser

Shin-Yuan Su and Pai-Chi Li  »View Author Affiliations

Optics Express, Vol. 19, Issue 2, pp. 1174-1182 (2011)

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A Q-switched Nd:YAG laser providing nanosecond pulse durations and millijoule pulse energies is suitable for typical biomedical PA applications. However, such lasers are both bulky and expensive. An alternative method is to use a diode laser, which can achieve a higher pulse repetition frequency. Although the energy from a diode laser is generally too low for effective PA generation, this can be remedied by using high-speed coded laser pulses, with the signal intensity of the received signal being enhanced by pulse compression. In this study we tested a version of this method that employs coded excitation. A 20-MHz PA transducer was used for backward-mode PA detection. A frequency-coded PA signal was generated by tuning the interval between two adjacent laser pulses. The experimental results showed that this methodology improved the signal-to-noise ratio of the decoded PA signal by up to 19.3 dB, although high range side lobes were also present. These side lobes could be reduced by optimizing the compression filter. In contrast to the Golay codes proposed in the literature, the proposed coded excitation requires only a single stimulus.

© 2011 OSA

OCIS Codes
(000.0000) General : General
(000.2700) General : General science

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: October 21, 2010
Revised Manuscript: December 25, 2010
Manuscript Accepted: January 9, 2011
Published: January 11, 2011

Virtual Issues
Vol. 6, Iss. 2 Virtual Journal for Biomedical Optics

Shin-Yuan Su and Pai-Chi Li, "Coded excitation for photoacoustic imaging using a high-speed diode laser," Opt. Express 19, 1174-1182 (2011)

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