Importance

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Abstract

A fiber optic projection device is provided that includes red, green and blue fiber optic sources, each of which includes at least one fiber amplifier for emitting an amplified signal of a predetermined wavelength. To provide signals that are scalable to high power levels, each fiber optic source can include a master oscillator, a plurality of fiber amplifiers for amplifying the input signals provided by the master oscillator and a combiner for combining the amplified signals emitted by each of the fiber amplifiers. While the fiber amplifier of each fiber optic source can be a dual core fiber that is appropriately doped, the red fiber optic source can include fiber amplifiers that rely upon Raman gain to provide the desired amplification. The red fiber optic source therefore not only includes a master oscillator, but also includes a red subharmonic oscillator for generating signals having a Raman seed wavelength for amplification by the fiber amplifiers. Each fiber optic source also includes a frequency altering device, such as a frequency doubler, for altering the frequency of the amplified signals to produce a signal having the respective color. The fiber optic projection device also includes at least one modulator for individually modulating the intensity of the signals having the respective colors. For example, the master oscillator can be modulated to control the duty cycle of the emitted signals. Further, the fiber optic projection device can include a projector for mixing the modulated signals having the different colors to create a full color image.

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First Claim