Patent ID: 6643058
Filing Date: 2003-11-04
Classification: H01S

Abstract:
Optical pumping unit comprisinga first pump source adapted to emit a first pump radiation at wavelength &lgr;p1; a second pump source adapted to emit a second pump radiation at wavelength &lgr;p2, with the wavelength &lgr;p2 different from the wavelength &lgr;p1; and a common coupling section comprising a first and a second port connected to the first and second pump source for respectively receiving the first and the second pump radiation; a third port for a signal radiation at wavelength &lgr;s; and a fourth port; wherein said coupling section is adapted to combine, in the fourth port, the signal radiation and the first and second pump radiation by means of a reversal of the direction of propagation of the first pump radiation from the first port to the fourth port.