Spatial control of urea crystal growth by focused femtosecond laser irradiation

Hiroshi Y. Yoshikawa, Yoichiroh Hosokawa*, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticle

35 Scopus citations

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.

Original languageEnglish
Pages (from-to)302-305
Number of pages4
JournalCrystal Growth and Design
Volume6
Issue number1
DOIs
StatePublished - 1 Jan 2006

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