Abstract
We report the fabrication of a highly multi-mode square core jacketed air-clad fiber with a top-hat near-field intensity profile. Using this fiber to deliver Q-switched pulses at 1 mum we have successfully produced square shaped ablation marks in indium tin oxide (ITO) without the use of complex beam shaping optics.
Highlights
The ideal beam delivery system for an industrial processing tool should supply laser light with the desired shape and intensity profile directly to the work piece, with minimal energy losses
We report the fabrication of a highly multi-mode square core jacketed air-clad fiber with a top-hat near-field intensity profile
This process has been demonstrated using a large solid state laser, one could envisage the creation of a compact system by using a fiber laser source
Summary
The ideal beam delivery system for an industrial processing tool should supply laser light with the desired shape and intensity profile directly to the work piece, with minimal energy losses. An example of this fiber type, shown in cross-section, illustrates how a single ring of air tubes can be used to optically isolate a large fiber core and create a waveguide from a single material These structures, which are typically referred to as jacketed air-clad (JAC) fibers, offer potential power handling advantages over polymer clad designs, since they can be made entirely from pure silica, and enable a much. The average refractive index of the microstructured region is determined by the width of the supporting struts (shown in higher magnification in Fig. 1(b)) and can be accurately tailored from values approaching those of both pure silica and air by changing the strut width [3] This enables JAC fibers with arbitrarily low values of numerical aperture up to values as a high as 0.9 to be created [3, 4], which offers great promise for highly multi-mode beam delivery. We show that this fiber can be used to create square ablation marks in an ITO film on a glass substrate
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