The therapeutic laser shower LASS-Expert is used for application on larger surfaces (e. g., in trauma, arthropathy, hypertonia of large muscles and dermatology). It works with 21 laser diodes (2.100 mW Power output max.) and offers continuous output, alpha, Nogier, Bahr, Reininger and multifrequency or freely selectable frequencies (software extension optionally available). The infrared diode laser with a wavelength of 808 nm provides the best values of penetration depth and biostimulation effi ciency according to latest scientific conclusions.