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Dear colleagues In many of our laboratories, very high peak power, 800 nm pulses are used often at high rep rates (amplified at 1 kHz with 1 mJ/pulse for example). In our laboratory, a co-worker has developed a serious damage on the skin and below the skin of his hand between thumb and pointing finger (of the hand that is used to align optics). The first signs started way over a year ago after feeling a number of high intensity pulses from within a NOPA. It cannot be excluded that it is also a cumulative effect over longer time. The damage does not seem to cure at all. The medical profession is not sure what the best cure in the present situation, but suggestions have already been given of tissue removal. Could you advice us regarding similar experiences in yours or other laboratories and on possible rational methods of curing skin and tissue damage since the penetration depth at these wavelength is subcutaneous, Sincerely yours Wim van der Zande ****************************************************************** * Prof. Dr Wim J. van der Zande * * Group: Atmospheric Photophysics (APP) * * FOM-Institute AMOLF * * Kruislaan 407 * * 1098 SJ Amsterdam, The Netherlands * * Phone: 31-20-608 1234 or 1235 (direct) * * Fax: 31-20-668 4106 * * Prive: 31-35-694 7979 * * Email: [log in to unmask] * * http://www.amolf.nl/research/atmospheric_photo_physics * * Associated with the Katholieke Universiteit Nijmegen * ******************************************************************