Despeckling Red Laser Light
A method of despeckling light that includes mixing high-speckle far-red laser light with low-speckle green laser light in amounts selected to achieve a desired color point in a digital image. The far-red laser light may be red laser diodes with wavelengths in the range of 640 to 680 nm. The green laser light may include stimulated-Raman-scattering light from an optical fiber. The desired color point may be DCI red or Rec. 709 red.
1 . A method of despeckling light comprising:
generating a far-red laser light;
generating a low-speckle green laser light; and
forming a combination of laser light by mixing the far-red laser light with the low-speckle green laser light;
wherein an amount of the far-red laser light and an amount of the low-speckle green laser light are selected so that the combination of laser light achieves a desired color point.
2 . The method of claim 1 wherein the combination of laser light has a lower speckle characteristic than the far-red laser light.
3 . The method of claim 1 wherein the far-red laser light is generated from a laser light source and the laser light source comprises a laser diode.
4 . The method of claim 3 wherein the laser diode generates light in the range of 640 nm to 680 nm.
5 . The method of claim 4 wherein the laser diode generates light in the range of 645 nm to 655 nm.
6 . The method of claim 3 wherein the laser light source comprises an optical parametric oscillator.
7 . The method of claim 1 wherein the desired color point is DCI red.
8 . The method of claim 1 wherein the desired color point is Rec. 709 red.
9 . The method of claim 1 wherein the combination of laser light comprises approximately 3 parts by brightness of the far-red laser light and approximately 1 part by brightness of the low-speckle green laser light.
10 . The method of claim 1 wherein the combination of laser light comprises approximately 1 parts by brightness of the far-red laser light and approximately 1 part by brightness of the low-speckle green laser light.
11 . The method of claim 1 further comprising:
forming a digital image with the combination of laser light as a first primary color of the digital image.
12 . The method of claim 11 further comprising:
forming the digital image with the low-speckle green laser light as a second primary color of the digital image.
13 . The method of claim 1 further comprising:
generating a stimulated Raman scattering light;
wherein the step of generating the low-speckle green laser light comprises the step of generating the stimulated Raman scattering light.
14 . The method of claim 13 wherein the step of generating stimulated Raman scattering light is performed in an optical fiber.