Cascaded Raman laser

摘要

A cascaded Raman laser ( 10 ) has a pump radiation source ( 12 ) emitting at a pump wavelength lambda_p, an input section ( 14 ) and an output section ( 16 ) made of an optical medium. Each section ( 14, 16 ) comprises wavelength selectors ( 141, 142, . . . , 145 and 161, 162, . . . , 165 ) for wavelengths lambda₁, lambda₂, . . . , lambda_n-k, where n>=3, lambda_p12< . . . n-1n and lambda_n-k+1, lambda_n-k+2, . . . , lambda_n being k>=1 emitting wavelengths of the laser ( 10 ). The laser further comprises an intracavity section ( 18 ) that is made of a non-linear optical medium, has a zero-dispersion wavelength lambda₀ and is disposed between the input ( 14 ) and the output ( 16 ) section. The wavelengths lambda₁, lambda₂, . . . , lambda_n-k of the wavelength selectors ( 141, 142, . . . , 145 and 161, 162, . . . , 165 ) and the zero-dispersion wavelength lambda₀ of the intracavity section ( 18 ) are chosen such that energy is transferred between different wavelengths by multi-wave mixing.