摘要:
A uniform temperature profile is provided across the width of the core of a ribbon fiber laser or amplifier by the use of insulating elements at the core edges and a spatially variable gain in the fiber core. High average power ribbon fibers, enable a variety of applications such as practical laser cutting and beam combining.
摘要:
A pump laser package (650) may include an input fiber (205) to send signal light on a first optical path inside a package, a source (215) to send pump light on a second optical path inside the package, and an output fiber (210) on a third optical path inside the package. The pump laser package(650) may include a WDM filter inside the package to receive the signal light on the first optical path and send the signal light on the third optical path, and receive the pump light on the second optical path and send the pump light on the third optical path. The pump laser package (650) may include an isolator (405) inside the package to transmit the signal light in a first direction, and block the signal light in a second direction, or a photo-diode (510) to receive a portion of the signal light sent on a fourth optical path.
摘要:
A single mode (SM) high power laser system is configured with a laser source outputting a single mode or low mode kW-power light and a passive delivery fiber spliced to an output fiber of the fiber laser source and having a double bottleneck-shaped core. The latter is configured to increase a threshold for nonlinear effects in general and in particular for stimulated Raman scattering (SRS) so that the delivery passive fiber has a fiber length at least twice the length of a delivery passive fiber with a standard unifomily dimensioned core, which may be used with the same laser source, while outputting the kW-power light with an M2 factor less than 2.
摘要:
Apparatus for optical isolation, which apparatus comprises a laser (1), a beam delivery system (91), and an output port (92), wherein: the beam delivery system (91) comprises an optical isolator (8) and an optical fibre (2); the laser (1) is defined by a peak power (21); the laser (1) emits laser radiation (13) at a signal wavelength (19); the laser radiation (13) is coupled from the laser (1) to the output port (92) via the beam delivery system (91); and the optical fibre (2) comprises an optical waveguide (100) defined by a core (101), a cladding (102), a mode field area (104) at the signal wavelength (19), a length (86), and a Raman wavelength (25); and the apparatus being characterised in that: the Raman wavelength (25) is longer than the signal wavelength (19); the beam delivery system (91) attenuates the laser radiation (13) at the signal wavelength (19) such that the power of the laser radiation (13) emitted by the laser (1) is more than the power of the laser radiation (13) at the output port (92); the apparatus does not include a pump for pumping the laser radiation (13) at the signal wavelength (19) as the laser radiation (13) propagates along the optical fibre (2); the optical isolator (8) has greater backward optical isolation (33) and greater forward transmission (28) at the signal wavelength (19) compared to the Raman wavelength (25); and the optical fibre (2) comprises a suppressing means (94) for suppressing stimulated Raman scattering.
摘要:
Un dispositif de génération (DG) comprend: une source laser impulsionnelle (SL) délivrant des photons primaires présentant au moins une longueur d'onde dans des impulsions ayant une dissymétrie temporelle, des moyens de mise en forme (MM) agissant sur les photons primaires pour délivrer un faisceau d'entrée (FE) focalisé et ayant une polarisation choisie, et une fibre optique (FO) dans laquelle les photons primaires induisent des photons secondaires présentant différentes longueurs d'onde résultant d'une cascade de conversions Raman, et constituant un faisceau de sortie (FS) à spectre large et énergie sensiblement constante.
摘要:
Eine Faserhalterungseinheit (1) zum Bereitstellen einer Lichtleitfaser (19) für ein Faserlasersystem umfasst einen Grundkörper (1A), der einen Faserendbefestigungsabschnitt (31A, 31B), einen Faserführungsabschnitt (33) und einen Verbindungsabschnitt (35A, 35B) zwischen dem Faserendbefestigungsabschnitt (31A, 31B) und dem Faserführungsabschnitt (33) aufweist. Der Faserendbefestigungsabschnitt (31A, 31B) ist zur Befestigung eines einen Faserendbereich (19A) der Lichtleitfaser (19) haltenden Aufnahmeelements (13) ausgebildet, der Faserführungsabschnitt (33) ist zur Führung eines Fasermittelbereichs der Lichtleitfaser (19) ausgebildet und der Verbindungsabschnitt (35A, 35B) ist zwischen dem Faserendbefestigungsabschnitt (31A, 31B) und dem Faserführungsabschnitt (33) als Festkörpergelenk ausgebildet.
摘要:
An amplifying optical device (10) for providing optical amplification, the amplifying optical device (10) comprising at least one pump (11) for supplying pump radiation, at least one pump optical fibre (1) and at least one amplifying optical fibre (2), the amplifying optical device (10) being such that: the pump optical fibre (1) and the amplifying optical fibre (2) are coated with a common coating (3) and are in optical contact along a portion of their length (4), the pump optical fibre (1) is separated from the amplifying optical fibre (2) at two end portions (5, 6) of the common coating (3), one of the separated end portions (5) of the pump optical fibre (1) is connected to the pump (11), the pump optical fibre (1) and the amplifying optical fibre (2) comprise glass (7), the amplifying optical fibre (2) comprises a core (8) and a cladding (9), the core (8) is doped with at least one rare earth dopant (12), and the amplifying optical device (10) being characterized in that: the pump optical fibre (1) comprises a mode coupling means (15) in the form of a variation of refractive index with azimuth along at least one circle of constant radius, which variation has at least one azimuthal harmonic having an amplitude greater than an amplitude of a first and a second azimuthal harmonic, and which thereby couples guided modes of the pump optical fibre (1) to guided modes of the amplifying optical fibre (2) that overlap and can be absorbed by the rare earth dopant (12) in the core (8).
摘要:
A pumped optical ring laser sensor such as a gyroscope includes a pulsed laser source to generate optical pump pulses and a synchronously pumped ring laser. The ring laser is optically pumped by first optical pump pulses from the pulsed laser source that are directed in a clock-wise (CW) direction through the ring laser and by second optical pump pulses from the pulsed laser source that are directed in a counter-clock wise (CCW) direction through the ring laser. The ring laser has an optical resonator that includes a gain medium for producing CW and CCW frequency-shifted pulses from the first and second optical pump pulses. The ring laser further includes a port for receiving the first and second pump pulses and for extracting the CW and CCW frequency-shifted pulses from the ring laser such that the frequency-shifted pulses overlap in time after being extracted to generate a beatnote.
摘要:
A mid-infrared cascading fiber amplifier device having a source configured to generate a first electromagnetic wave output at a first frequency, a fiber coupled to the source and a pump coupled to the fiber and configured to generate a second electromagnetic wave output at a second frequency, wherein the second frequency is higher than the first frequency and causes the fiber to undergo two or more transitions in response to stimulation by the first electromagnetic wave output at the first frequency, wherein the first transition generates the first electromagnetic wave output approximately at the first frequency and the second transition generates the first electromagnetic wave output approximately at the first frequency.
摘要:
A fiber amplifier system including a plurality of fiber amplifiers each receiving a fiber beam and a tapered fiber bundle (TFB) combiner including a plurality of input end fibers, a plurality of output end fibers and a center bundle portion, where each input end fiber is coupled to a separate one of the fiber amplifiers, and where the bundle portion combines all of the fiber beams into a single combined beam and each output end fiber being capable of receiving the combined beam separately from the other output end fibers. The system also includes a low non-linear delivery fiber coupled to an output end fiber of the TFB combiner and an optical output turret coupled to the delivery fiber opposite to the TFB combiner, wherein the non-linear delivery fiber is configured to reduce the effect of cross-phase modulation (XPM) instability in the delivery fiber.