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Wavelength tuning of fiber lasers using multimode interference effects

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We report on a novel scheme to fabricate a simple, cheap, and compact tunable fiber laser. The tuning is realized by splicing a piece of single-mode fiber to one end of an active double-clad fiber, while the other end of the single-mode fiber is spliced to a 15 mm long section of 105/125 multimode fiber. The fluorescence signal entering into the multimode fiber will be reproduced as single images at periodic intervals along the propagation direction of the fiber. The length of the multimode fiber is chosen to be slightly shorter than the first re-imaging point, such that the signal coming out from the single mode fiber is obtained in free space, where a broadband mirror retroreflects the fluorescence signal. Since the position of the re-imaging point is wavelength dependent, different wavelengths will be imaged at different positions. Therefore, wavelength tuning is easily obtained by adjusting the distance between the broadband mirror and the multimode fiber facet end. Using this principle, the tunable fiber laser revealed a tunability of 8 nm, ranging from 1088–1097 nm, and an output power of 500 mW. The simplicity of the setup makes this a very cost-effective tunable fiber laser.

©2005 Optical Society of America

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Figures (6)

Fig. 1.
Fig. 1. Schematic diagram of the components of the wavelength tuning device.
Fig. 2.
Fig. 2. (a) Numerical calculation of the beam propagation along a piece of 105/125 μm multimode fiber and (b) Photograph of the interference pattern at the end of the fiber facet.
Fig. 3.
Fig. 3. Configuration of the tunable double-clad Ytterbium-doped fiber laser.
Fig. 4.
Fig. 4. Tuning characteristics of the double-clad Yb-doped fiber laser using our multimode interference tuning device. (Inset: The reflection response of the dichroic mirror)
Fig. 5.
Fig. 5. Output power vs. tuning wavelength range for our novel tunable YDFL (square) and separation distance of the mirror vs. tuning wavelength for the novel tunable YDFL (circle).
Fig. 6.
Fig. 6. Output laser power at 1094.5 nm as a function of the current driver at 915 nm in a double ytterbium doped fiber.

Equations (2)

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L = p ( 3 L π 4 ) with p = 0,1,2 ,…‥ ,
L π = 4 n MMF W 2 MMF 3 λ 0 .
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