Pulsed fiber laser
AssigneeNkt Photonics GmbH
InventorsThomas Nikolajsen, Peter M.W. Skovgaard
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Abstract
A method and a laser system for generating a pulsed laser signal with a laser signal wavelength and a laser signal repetition rate, the laser system includes a fiber laser unit includes a cladding pumped fiber laser includes a fiber laser light guiding region surrounded by a pump cladding, the fiber laser light guiding region includes at least one active element; at least one pump laser unit for launching a pump signal into the cladding pumped fiber laser, the pump signal unit includes at least one pump diode emitting a signal at a pump signal wavelength; and a modulating unit for modulating the pump signal into a plurality of pump pulses.
Claims52
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A laser system arranged to generate a pulsed laser signal with a and a laser signal repetition rate, said laser system comprising
- a fiber laser unit comprising a cladding pumped fiber laser comprising a fiber laser light guiding region surrounded by a pump cladding, said fiber laser light guiding region comprising at least one active element;
- at least one pump laser unit arranged to launch a pump signal into said cladding pumped fiber laser, said pump laser unit comprising at least one pump diode arranged to emit said pump signal at a pump signal wavelength;
- and
- a modulating unit arranged to modulate said pump signal into a plurality of pump pulses each arranged to generate relaxation oscillations in the laser action of said cladding pumped fiber laser, said relaxation oscillations each having a leading pulse wherein said laser system is arranged so the initiation of each leading pulse of said relaxation oscillations is based on spontaneous emission where said modulating unit is arranged to modulate said pump signal such that the energy of the individual laser pulses of said pulsed laser signal is substantially confined to said leading pulses.
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A system for gain switching of a cladding pumped fiber laser device arranged to generate a pulsed laser signal with a laser signal wavelength and a laser signal repetition rate said system comprising
- at least one pump laser unit arranged to launch a pump signal into said cladding pumped fiber laser, said pump laser unit comprising at least one pump diode arranged to emit said pump signal at a pump signal wavelength;
- and
- a modulating unit arranged to modulate said pump signal into a plurality of pump pulses each arranged to generate a leading pulse of a set of relaxation oscillations in the laser action of said cladding pumped fiber laser,
- wherein said laser system is arranged so the initiation of each leading pulse is based on spontaneous emission and said pump pulses are arranged so their individual pulse energy is substantially coupled into said leading pulse.
Dependencies are inferred from the claim text.