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Method of preventing post pulsing of Q-switched laser

  • US 3,982,203 A
  • Filed: 12/28/1973
  • Issued: 09/21/1976
  • Est. Priority Date: 12/28/1973
  • Status: Expired due to Term
First Claim
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1. A method of preventing post pulsing of an acousto-optically Q-switched laser system comprising a laser cavity which includes therein a laser rod, first reflecting means mounted along the optical axis of said rod, feedback reflecting means mounted on the opposite side of said rod from said first reflecting means at an angle to said axis, optical pumping means for exciting the laser rod, and an acousto-optic Q-switch mounted on the optical axis of the laser rod between the laser rod and the feedback reflecting means and energizable for deflecting radiation from said laser rod to said feedback reflecting means to provide lasing action as a Q-switched pulse of lasing energy, said method comprising:

  • placing a filtering material within the laser cavity between said laser rod and said optical pumping means wherein the filtering material is substantially transparent to pumping radiation and substantially opaque to radiation at the lasing wavelength, andpreventing residual radiation emitted in random directions from the laser rod at the lasing wavelength from being deflected into the rod into directions near enough to the axial direction to be regeneratively amplified, by absorption of said radiation in the filtering material during periods when the acousto-optic Q-switch is energized and following the generation of the Q-switched pulse of lasing energy.

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