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Propagation and spatiotemporal coupling of iso-diffraction ultra-short pulsed Hermite Gaussian beams in free space

Qian Lie-Jia Fan Dian-Yuan Hu Wei Lu Da-Quan

Propagation and spatiotemporal coupling of iso-diffraction ultra-short pulsed Hermite Gaussian beams in free space

Qian Lie-Jia, Fan Dian-Yuan, Hu Wei, Lu Da-Quan
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  • Received Date:  30 October 2007
  • Accepted Date:  08 December 2007
  • Published Online:  20 March 2009

Propagation and spatiotemporal coupling of iso-diffraction ultra-short pulsed Hermite Gaussian beams in free space

  • 1. (1)复旦大学光科学与工程系先进光子学材料与器件国家重点实验室,上海 200433; (2)华南师范大学光子信息技术广东省高校重点实验室,广州 510631; (3)华南师范大学光子信息技术广东省高校重点实验室,广州 510631;复旦大学光科学与工程系先进光子学材料与器件国家重点实验室,上海 200433

Abstract: A family of solutions called iso-diffraction ultra-short pulsed Hermite Gaussian beams (UPHGB) are obtained based on the paraxial propagation equation. The propagation of UPHGB is investigated in detail. The examples shows that: the nonuniformlly distributed group velocity causes the time delay at the beam periphery, which in turn induces the deviation of the transverse distribution from the Hermite Gaussian function. In propagation, the number of pulse polarity inverions varies with the order of the UPHGB. And this phenomenon originates in the difference between the group velocity and the phase velocity in UPHGB.

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