Raman fiber laser

A fiber laser system, comprising:

• an energy source capable of producing pump energy;
• a fiber coupled to the energy source so that the pump energy can be transferred from the energy source to the fiber, the fiber having a loop-shaped portion, a first non loop-shaped portion, and a second non loop-shaped portion;
• a first fiber Bragg grating in the first non loop-shaped portion of the fiber, the first fiber Bragg grating being capable of substantially reflecting energy comprising a Stoke shifted wavelength;
• a second fiber Bragg grating in the second non loop-shaped portion of the fiber, the second fiber Bragg grating being capable of substantially reflecting energy having a wavelength comprising the Stoke shifted wavelength.

A fiber laser system, comprising:

• an energy source capable of producing pump energy;
• a fiber coupled to the energy source so that the pump energy from the energy source can be transferred to the fiber;
• a first pair of fiber Bragg gratings in the fiber, the gratings in the first pair being capable of substantially reflecting energy at a first wavelength corresponding to a first order Stoke shifted energy;
• a second pair of gratings in the fiber, the gratings in the second pair being capable of substantially reflecting energy at a second wavelength corresponding to an order of Stoke shifted energy that is greater than one;
• and
• a third pair of gratings in the fiber, the gratings in the third pair being capable of substantially reflecting energy at a third wavelength corresponding to an order of Stoke shifted energy that is greater than the second wavelength, wherein no grating of the third pair is located between the gratings of the second pair.

A fiber laser system, comprising:

• an energy source capable of producing pump energy;
• a fiber coupled to the energy source so that the pump energy can be transferred from the energy source to the fiber, the fiber having a loop-shaped portion, a first non loop-shaped portion, and a second non loop-shaped portion;
• a first fiber Bragg grating in the first non loop-shaped portion of the fiber, the first fiber Bragg grating being capable of substantially reflecting the pump energy;
• a second fiber Bragg grating in the second non loop-shaped portion of the fiber, the second fiber Bragg grating being capable of substantially reflecting energy having a wavelength comprising a Stoke shifted wavelength;
• and
• a third fiber Bragg grating in the second non loop-shaped portion of the fiber, the third fiber Bragg grating being capable of substantially reflecting energy having a wavelength comprising a second Stoke shifted wavelength.