Recently red DFBs at 633 nm have been reported with very good single frequency characteristics, but require a relatively complicated regrowth procedure and unless manufactured in volume will remain costly. A simpler way to stabilize the output of Fabry-Perot diodes is to use a fiber grating, such as used for 980 nm lasers for erbium doped optical amplifiers. The lasers operate in basically two regimes. When the reflectivity of the fiber grating is large compared to the front facet reflectivity, and the distance between the grating and the diode is short, the device runs single mode with a very narrow linewidth, but is unstable as the laser switches between the modes of the extended cavity. However, if the grating is relatively weak, and the distance is kept large (> 5-10 cm), the laser operates in a state of coherence collapse, where extended cavity modes are no longer distinct. The device is very stable both in intensity and in frequency, and potentially less sensitive to feedback. Although such fiber grating stabilized devices are common in the infra-red telecommunication wavelengths, there have been no such devices demonstrated in the visible. In this paper gratings, 2 mm long, were formed in hydrogen-loaded boron-codoped germanosilicate fibre which had an LP/sub 11/ cutoff wavelength of around 450 nm. They were written by holographic exposure using a tunable Sagnac ring interferometer that used a phase mask as a beam splitter. The UV light source was a CW frequency-doubled argon ion laser that produced about 60 mW at a wavelength of 244 nm. Exposure times were 6 to 10 seconds. Shorter wavelength first order gratings have previously been reported by coupling 488 nm radiation directly into the fiber and obtaining a standing wave from the end facet reflection. To our knowledge, however, these are the shortest wavelength side-written gratings published or reported. We used a grating with a 10% reflectivity with a bandwidth of about O.l nm.


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    Title :

    633 nm fiber grating-stabilized diode laser


    Contributors:
    Pezeshki, B. (author) / Yoffe, G.W. (author) / Agrawal, V. (author) / Hagberg, M. (author) / Zou, S. (author)


    Publication date :

    1999-01-01


    Size :

    170664 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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