Abstract
Recently, the use of a focused femtosecond laser source to directly write structures deep within glass has attracted much attention due to its simplicity compared to lithographic methods, and its ability to write in three-dimensions.1,2 We have developed a novel technique, which enables us to write such structures within the bulk of an optical fiber through its cleaved face, enabling control over light subsequently exiting the fiber. Figure 1 displays the experimental set-up where an amplified Ti:Sapphire 150 fs pulsed laser with a repetition rate of 250 kHZ is used to irradiate the samples at 850 nm, via a 50x objective. The typical pulse energy utilized is 0.5 μj. Initial positioning of the focal spot of the laser relative to the core of the fiber is achieved by maximizing the guiding of the pulsed light through the fiber at an intensity below damage threshold.3 Observation of the processing subsequently written into the core and cladding regions of the fiber can be monitored in situ via a coaxial CCD system. Alternatively, the CCD camera can been used to monitor the effects of material damage on the mode during irradiation, by coupling a laser to the opposite end of the fiber, in place of the photo-diode.
© 2002 Optical Society of America
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