Mark Thomas Johnson,Calina Ciuhu,Rieko Verhagen,Bastiaan Wilhelmus Maria Moeskops,Kiran Kumar Thumma,Thomas Adriaan Cohen Stuart,Petrus Cornelis Paulus Bouten,Roelof Koole,Emile Johannes Karel Versteg
申请号：
US14405243
公开号：
US20150202006A1
申请日:
2013.05.22
申请国别(地区):
US
年份:
2015
代理人:
摘要：
A laser-based hair cutting device (10) is provided, which device (10) comprises a laser source (18), an optically transparent exit window (15) and optical elements (11, 12, 13, 14) The laser source (18) provides an incident light beam (21) for cutting a hair (22) above and near a skin surface by laser-induced optical breakdown (LIOB) of the hair (22) in a focal position of the light beam (21). The optically transparent exit window has an external exit surface (15) for allowing the incident light beam (21) to leave the device. The optical elements (11, 12, 13, 14) focus the incident light beam (21) in the focal position at a working distance from the exit surface (15). The laser source (18) and the optical elements are arranged and configured such that the working distance is at least (I) wherein NA is a numerical aperture of the incident light beam leaving the device (10), Ep is a pulse energy (J) of the incident light beam (21), Fthresh is a fluence threshold (J/m2) of the exit surface, M2 is a beam quality of the incident light beam (21) and λ is a wavelength (m) of the incident light beam (21).
