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We report the fabrication of efficient, buried diffraction gratings and micro-craters in bulk polystyrene using femtosecond laser direct writing technique. We recorded a maximum diffraction efficiency of 10% for a buried grating fabricated at 1μJ energy, 1mm/s speed, and a period of 30μm. Buried micro-craters, with typical dimensions of ∼2μm, were achieved at low energies and high scanning speeds...
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