Two new types of optical fibers, where air-holes are running down their length, are considered for making fiber lasers with Bragg gratings. The mode areas for pump and signal in these fiber lasers may be either larger or smaller compared to the corresponding mode areas for fiber lasers based on standard step index fibers. This makes possible realization of fiber lasers with a low pump threshold (small mode area), and fiber lasers suitable for high-power applications (large mode area).
Thomas ndergaard, "Photonic Crystal Distributed Feedback Fiber Lasers with Bragg Gratings," J. Lightwave Technol. 18, 589- (2000)
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