Patent ID: 7843975

Claim:
A high-power fiber optic pulsed laser device comprising: at least one laser diode ( 1 ) suitable for emitting a pump wave, a triggered optical resonator ( 22 ) suitable for generating a laser wave, comprising: a reflective end ( 12 ) and a partially reflective end ( 9 ) suitable for partially transmitting the pump wave and the laser wave outside of the triggered optical resonator ( 22 ), an amplifying medium consisting of a first optical fiber ( 6 ) suitable for absorbing the pump wave and for amplifying the laser wave, disposed between the two reflective ends ( 9 ) and ( 12 ), an optical modulator ( 13 ) suitable for switching from an off-state to a on-state, an optical amplifier consisting of a second optical fiber ( 10 ), disposed such that the partially reflective end ( 9 ) of the triggered optical resonator ( 22 ) is located between the two optical fibers ( 6 , 10 ), said first ( 6 ) and second ( 10 ) optical fibers being of the double-sheathed optical fiber type with a core ( 30 ), a pumping sheath ( 31 ) and a confining sheath ( 32 ), and having each an inner end ( 18 , 19 ) and an outer end ( 17 , 20 ), first optical coupling means ( 33 , 34 ) suitable for coupling said pump wave to one of the two optical fibers ( 6 , 10 ) through the outer end ( 17 , 20 ) thereof, second optical coupling means ( 35 ) disposed between the two optical fibers ( 6 , 10 ), wherein, the optical modulator ( 13 ) is an acousto-optic or an electro-optic modulator, a doped core ( 30 ) of the optical fiber ( 6 , 10 ) through the outer end ( 17 , 20 ) of which said pump wave is coupled is suitable for partially absorbing the pump wave and for leaving a residual pump wave at the inner end ( 18 , 19 ) of said optical fiber ( 6 , 10 ), the second optical coupling means ( 35 ) are suitable for providing simultaneously the coupling of the residual pump wave and the coupling of the laser wave emerging from the triggered optical resonator ( 22 ), at the inner end ( 18 , 19 ) of the other of the two optical fibers ( 6 , 10 ), said second optical fiber ( 10 ) has a length greater than that of the first optical fiber ( 6 ), which makes it suitable for amplifying the laser wave emerging from the triggered optical resonator ( 22 ).