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We propose and experimentally demonstrate femtosecond direct laser writingwith Bessel beams for the fabrication of photonic crystals with spatialfiltering functionality. Such filters are mechanically stable, of small (oforder of millimeter) size, do not require direct access to the far-fielddomain, and therefore are excellent candidates for intracavity spatialfiltering applications in mini- and micro-lasers. The technique allows thefabrication of efficient photonic crystal spatial filters in glass, with anarrow angle (~1 degree) nearly 100%-transmission pass-band between broad angle(up to 10 degrees) nearly 0%-transmission angular stop-bands. We show, thatthis technique can not only significantly shorten the fabrication time, butalso allows the fabrication of large-scale defect-free photonic crystal spatialfilters with a wide filtering band.

Photonic Crystal Spatial Filters Fabricated by Femtosecond Pulsed Bessel Beam