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:
L'invention concerne un laser impulsionnel (10) à fibre optique et à dérive de fréquence pour l'amplification d'impulsions sub-picoseconde de forte énergie comprenant un oscillateur (1), un étireur à fibre (3), un ou plusieurs étages de pré-amplification et un étage d'amplification de puissance comprenant une section de fibre optique (4, 7) dopée Erbium ou co-dopée Erbium-Ytterbium, une pompe (8) apte à pomper optiquement par couplage dans la fibre optique de l'amplificateur de puissance (7) et un compresseur (9). Selon l'invention, la pompe (8) de l'étage de puissance génère au moins une longueur d'onde de pompe λP comprise entre 1530 et 1565 nm, la longueur d'onde d'émission des impulsions laser (20) est comprise entre 1565 et 1625 nm et l'énergie des impulsions laser (20) est comprise entre 10 nJ et quelques dizaines de μJ. L'invention concerne également un outil pour chirurgie ophtalmique comprenant un tel laser.
摘要:
The invention relates to a single-band optical fiber amplifier (10) comprising an amplifying fiber (4) and pumping means (3) in addition to reverberating means (20, 11) that send back amplified spontaneous emission noise to the amplifying fiber. The invention makes it possible to limit losses that are due to amplified spontaneous emission noise by sending said noise back towards the amplifying fiber in a direction of propagation which is opposite to the direction of propagation of the signal that is to be amplified.
摘要:
The invention relates to a device for ablating biological substances using a laser beam, especially during stomatological treatment, comprising a pump laser and a laser converter for converting the pump laser beam into a laser beam with a wavelength range of 3 mu m +/- 0.2 mu m. Said laser converter is placed in a processing head which is separated from the pump laser by a fiber optic device. In accordance with the invention, a metal holmium fluoride crystal with an alkali or alkaline earth ion as a metal ion and with partial substitution of the holmium (Ho) ions is provided in the laser converter, said crystal being one of the compounds Me(Ho1-xPrx)F4 with a metal ion of lithium (Li) or sodium (Na), a fluorine ion and containing x=0.001 to 0.03 parts praseodymium or Ba(Ho1-xPrx)2F8 with Ba a barium ion, with F a fluorine ion and containing x=0.0005 to 0.015 parts praseodymium.
摘要:
A mid- to far-infrared solid state Raman laser system comprising a resonator cavity comprising: an input reflector adapted to be highly transmissive for light with a first wavelength in the range of about 3 to about 7.5 micrometers for admitting the first beam to the resonator cavity; and an output reflector adapted to be partially transmissive for light with a second wavelength greater than about 5.5 micrometers for resonating the second wavelength in the resonator and for outputting an output beam, the input reflector further being adapted to be highly reflective at the second wavelength for resonating the second wavelength in the resonator; and a solid state diamond Raman material located in the resonator cavity for Raman shifting the pump beam and generating the second wavelength.
摘要:
A laser diode pump for fiber amplifiers, such as erbium-doped fiber amplifiers (EDFAs), reduces spurious reflections in the signal frequencies by providing a laser pump system that is dissipative at these signal frequencies. Reflections from the pump system are reduced, or eliminated by using an output facet that is currently coated to be reflective at pump frequencies, but anti-reflective, or transmissive, at the signal frequencies. In one embodiment, material layers of aluminum oxide (Al2O3), titanium dioxide (TiO2), and silicon dioxide (SiO2) are used.
摘要翻译:用于光纤放大器的激光二极管泵(例如掺铒光纤放大器(EDFA))通过提供在这些信号频率处耗散的激光泵系统来减少信号频率中的伪反射。 来自泵系统的反射通过使用当前被涂覆为在泵浦频率处反射但在反射或者透射的信号频率处的反射的输出小面被减少或消除。 在一个实施例中,使用氧化铝(Al 2 O 3),二氧化钛(TiO 2)和二氧化硅(SiO 2)的材料层。
摘要:
A method of operating an optical amplifier for improved gain and pump-to-signal conversion efficiency in a long wavelength spectral region (L-band) of the emission spectrum of a rare earth doped gain medium having a known pump absorption band involves the steps of providing an optical signal to the amplifier having a large-signal input power; and providing pumping light to the amplifier having a wavelength that is different from a center wavelength of the known pump absorption band for amplifying the optical signal. Signal gain and improved pump-to-signal conversion efficiency was demonstrated for an erbium L-band signal by detuning the pump between about +/-0-30nm on either side of the pump band center wavelength of 979-980nm. An optical amplifier employing the described method is also disclosed.
摘要:
A longitudinally-cooled laser element assembly comprises an optically transparent heat sink (OTH) (110, 120) coupled to a laser element (100) and a heat sink (130, 140). An etalon structure including a first flat surface and a second, substantially parallel flat surface is formed in the laser element and/or the OTH. In some embodiments, a balanced etalon is provided by forming a reflector on the second flat surface (107) of the etalon that has a reflectivity approximately equal to the Fresnel loss at the interface between the OTH and the laser element. In some embodiments the laser element assembly includes a second OTH (120) coupled to the laser element at a second interface, thereby defining a second Fresnel loss. Preferably, the second OTH has an index of refraction substantially equal to the index of refraction of the first OTH, so that said first and second Fresnel losses are approximately equal and a balanced etalon is formed. In some embodiments the laser element comprises a solid-state gain medium. In other embodiments the laser element comprises a nonlinear frequency conversion crystal. An intracavity frequency-converted laser is described in which OTHs are used to cool both the gain medium and the nonlinear material.
摘要:
A laser structure is provided that includes a pulsed source producing a pulsed signal having a low spontaneous noise component to its spectral output and a pulse-shape that is optimally flat. Also, the laser structure includes one or more optical fiber structures receiving the pulsed signal and performing Raman amplification. The pulsed signal is used to excite in the one or more optical fiber structures possessing normal chromatic dispersion, which acts as a nonlinear system for efficient mid- infrared spectral generation.
摘要:
An L-band Er-doped optical amplifier has a 60m to 110m length of doped optical fiber. Pump light in the wavelength range from 1435nm to 1460nm is coupled into the fiber. Substantially no light in the range 1465nm to 1505 nm is coupled into the fiber. The gain of the amplifier is greater than when using pump light of 1480nm.