Patent ID: 8582610
Filing Date: 2013-11-12
Classification: G02F,H01S,H05G

Abstract:
1. A radiation source that provides high order harmonic radiation (HHG radiation) in a wavelength range below 150 nm, comprising: a resonant enhancement cavity that guides laser light pulses generated outside the resonant enhancement cavity with a driving pulse laser source and that includes at least two cavity mirrors, said resonant enhancement cavity being arranged for a pulse superposition by coherent addition of said laser light pulses; a first non-linear medium comprising a liquid or gaseous material that provides the HHG radiation by harmonic generation based on an interaction of the laser light pulses with the first non-linear medium, wherein the first non-linear medium is arranged in the resonant cavity in an environment of pressure lower than atmospheric pressure; and a second non-linear medium arranged in the resonant enhancement cavity and adapted for at least one of amplifying the laser light pulses by addition of a predetermined amount of gain such that effective losses in the resonant enhancement cavity are compensated and phase locking longitudinal modes of the laser light pulses by addition of a predetermined optical nonlinearity such that material dispersion in the resonant enhancement cavity is compensated.