A medical apparatus comprising a first laser source operable to generate light at a first wavelength and supply a first laser light beam, a second laser source operable to generate laser light at a second wavelength and supply a second laser light beam, the first laser light beam being continuous or pulsed having a first, relatively long pulse duration, the second laser light beam being pulsed with a second, relatively short pulse duration, the apparatus being operable to supply the first laser light beam and subsequently the second laser light beam.
