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Ring cavity optical parametric apparatus

  • US 5,276,548 A
  • Filed: 12/01/1992
  • Issued: 01/04/1994
  • Est. Priority Date: 12/01/1992
  • Status: Expired due to Term
First Claim
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1. An optical parametric oscillator (OPO) for converting the output wavelength of a laser source into a signal wavelength and an idler wavelength comprising:

  • a ring cavity into which a laser pump beam is directed to be converted into a signal beam and an idler beam having different wavelengths than the pump beam, said ring cavity including(1) a first mirror having a first surface reflective with respect to said pump wavelength and highly transmissive with respect to said signal and idler beam wavelengths, said pump beam being incident on said first surface,(2) a non-linear crystal means located to receive a reflected pump beam reflected by said first mirror, said crystal means converting said reflected pump wavelength into said signal and idler wavelengths, both said signal and idler beams propagating in a direction common to each other and common to said pump beam,(3) a first reflecting element located to have said pump, signal, and idler beams incident thereon, said first reflecting element re-directing said pump, signal and idler beams to propagate in a second common direction that is parallel to said first common direction, said first reflecting element being oriented and positioned so that said pump, idler and signal beams propagating in said second common direction are incident on said non-linear crystal means and on said first mirror, said pump beam being reflected away from said cavity by a front surface of said first mirror, said first mirror having a second surface having a transmissive portion that is highly transmissive to said signal and idler wavelengths, said signal and idler beams being transmitted through the transmissive portion of the second surface of said first mirror, and(4) a second reflecting element located to have said signal and idler beams incident thereon, said second reflecting element re-directing said signal and idler beams 180°

    to propagate in a third common direction that coincides with said pump beam direction and said first common direction, said second reflecting element being oriented and positioned so that said idler and signal beams propagating in said third common direction are incident on said first mirror, said first mirror having a portion of said second surface thereof that is partially reflective with respect to said signal and idler wavelengths, said portion of said second surface being located to have signal and idler beams reflected by said second reflecting element incident thereon.

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