Process and apparatus for generating at least three laser beams of different wavelength for the display of color video pictures
First Claim
1. A three-color coherent light system, comprising:
- a laser source for generating a laser beam;
an optical parametric oscillator for providing a signal beam and an idler beam;
means for supplying said laser beam to said optical parametric oscillator for pumping said optical parametric oscillator to produce said signal and idler beams;
means for providing said laser beam as a source of coherent green light;
means for generating the second harmonic of said signal beam as a source of coherent blue light; and
means for generating the second harmonic of said idler beam as a source of coherent red light.
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Accused Products
Abstract
In a process for generating at least three laser beams of different wavelengths for displaying color video pictures, a pulsed laser is used to generate light. The light output of the pulsed laser is released in a pulse and is introduced into a medium with nonlinear optical characteristics for generating a laser beam. In addition to the laser beam generated by excitation, this medium releases an additional laser beam whose frequency is given by the sum or difference frequencies of the exciting laser beam and the excited laser beam due to the nonlinear optical characteristics of the medium. The laser beams generated by the medium in this way and the exciting laser beam are used directly, or after frequency conversion, to display monochromatic partial images of a color video picture. An apparatus according to the invention contains suitable devices for carrying out the process.
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Citations
12 Claims
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1. A three-color coherent light system, comprising:
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a laser source for generating a laser beam;
an optical parametric oscillator for providing a signal beam and an idler beam;
means for supplying said laser beam to said optical parametric oscillator for pumping said optical parametric oscillator to produce said signal and idler beams;
means for providing said laser beam as a source of coherent green light;
means for generating the second harmonic of said signal beam as a source of coherent blue light; and
means for generating the second harmonic of said idler beam as a source of coherent red light. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A three-color coherent light system, comprising:
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an optical parametric oscillator for providing a signal beam and an idler beam;
means for providing a first laser beam for pumping said optical parametric oscillator to produce said signal and idler beams;
means for generating the second harmonic of said signal beam as a source of coherent blue light; and
means for generating the second harmonic of said idler beam as a source of coherent red light. - View Dependent Claims (9, 10)
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11. A three-color coherent light system, comprising:
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a laser source for generating a laser beam;
an optical parametric oscillator for providing a signal beam and an idler beam;
means for supplying said laser beam to said optical parametric oscillator for pumping said optical parametric oscillator to produce said signal and idler beams;
means for adjusting said optical parametric oscillator by using the light intensity of said signal beam or of said idler beam or of a combination thereof, and adjusting the temperature of said optical parametric oscillator to readjust the wavelength of said signal beam and said idler beam;
means for providing said laser beam as a source of coherent green light;
means for generating the second harmonic of said signal beam as a source of coherent blue light; and
means for generating the second harmonic of said idler beam as a source of coherent red light.
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12. A three-color coherent light system, comprising:
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an optical parametric oscillator for providing a signal beam and a idler beam;
means for providing a first laser beam for pumping said optical parametric oscillator to produce said signal and idler beams;
means for adjusting said optical parametric oscillator by using the light intensity of said signal beam or of said idler beam or of a combination thereof and adjusting the temperature of said optical parametric oscillator to readjust the wavelength of said signal beam and said idler beam;
means for generating the second harmonic of said signal beam as a source of coherent blue light, and means for generating the second harmonic of said idler beam as a source of coherent red light.
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Specification