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.
摘要:
The invention relates to a phase shifting device (42') for stabilizing radially or azimuthally polarized laser radiation within a laser resonator (40') that comprises a polarizer device (42') for generating radially or azimuthally polarized laser radiation (3a, 3b). The phase shifting device (42') is designed to generate a phase difference (?f) ranging from about 30° to about 330°, preferably from about 70° to about 290°, especially preferably from about 160° to about 200°, particularly a phase difference (?f) of about 180° per revolution in the laser resonator (40') while having an axial symmetry. The invention further relates to a laser resonator (40') comprising such a phase shifting device (42').
摘要:
A system and method for controlling polarization in a fiber amplifier is disclosed. A polarization dither waveform is applied to a polarization controller so that dithering does not trigger PI-HOMI (Polarization-Induced High Order Mode Instability). The dither waveform may have a period that is much less than the thermal diffusion time across the fiber amplifier core. The dither waveform may also have a slew rate (defined in degrees/second on the Poincaré sphere) that is much slower than the thermal diffusion time across the fiber amplifier core.
摘要:
The invention relates to a phase shifting device (42') for stabilizing radially or azimuthally polarized laser radiation within a laser resonator (40') that comprises a polarizer device (42') for generating radially or azimuthally polarized laser radiation (3a, 3b). The phase shifting device (42') is designed to generate a phase difference (?f) ranging from about 30° to about 330°, preferably from about 70° to about 290°, especially preferably from about 160° to about 200°, particularly a phase difference (?f) of about 180° per revolution in the laser resonator (40') while having an axial symmetry. The invention further relates to a laser resonator (40') comprising such a phase shifting device (42').
摘要:
A system and method for controlling polarization in a fiber amplifier is disclosed. A polarization dither waveform is applied to a polarization controller so that dithering does not trigger PI-HOMI (Polarization-Induced High Order Mode Instability). The dither waveform may have a period that is much less than the thermal diffusion time across the fiber amplifier core. The dither waveform may also have a slew rate (defined in degrees/second on the Poincaré sphere) that is much slower than the thermal diffusion time across the fiber amplifier core.
摘要:
Methods and apparatuses for determining the polarization state and for providing polarization control in optical fiber lasers and amplifiers. One embodiment of the invention is an optical fiber amplifying system including a circulator (260) having a first optical port (260a), a second optical port (260b) that is configured to output radiation received from the first optical port, and a third optical port (260c) that is configured to output radiation received from the second optical port; one or more amplifier stages (216) connected in series, together having an optical input (216a) optically coupled to the second port of the circulator, and an optical output (216b); and a polarization detector (240) having an optical input optically coupled to the third port of the circulator. Thereby the polarization state of the amplified radiation can be determined using radiation backscattered from the amplifying stage.
摘要:
The present invention provides a burst-laser generator using an optical resonator which produces high pulse-strength of burst-laser in order to conduct laser Compton scattering, comprising: a self-oscillation amplifying optical loop-path and an external optical resonator to burst-amplify laser, wherein, laser supplied by an exciting laser source is self-oscillation amplified with the self-oscillation amplifying optical loop-path and further burst-amplified with the external optical resonator.