Abstract
Growth of urea crystals in a supersaturated solution of urea was spatially controlled by irradiation with a femtosecond laser pulse. When a needlelike urea crystal was irradiated by a single femtosecond laser pulse with wavelength of 800 or 1470 nm through an objective lens, a new needlelike crystal grew from the laser focal spot (approximately micrometer sized). The number of the laser-induced subsequent crystals increased with laser energy. However, such crystal growth could not be induced by 1480 nm continuous wave (CW) laser irradiation. By application of the new phenomenon, patterning of the crystals was successfully demonstrated. Finally, the mechanism of the femtosecond laser-induced crystallization was discussed in terms of the crystal fragmentation caused by photomechanical effect.
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