Abstract:
Disclosed are optical gain fibers which include an erbium-containing core and a cladding surrounding the core and which have ripple of less than about 25 % over about a 40 nm wide window or ripple of less than about 15 % over about a 32 nm wide window, or both. In one embodiment, the optical gain fibers are pumpable at 980 nm and at 1480 nm. In another embodiment, the optical gain fibers are fusion sliceable. In yet another embodiment, the core includes oxides erbium; the cladding includes silicon dioxide; and the optical gain fiber has a passive loss of less than about 0.5 % of the peak absorption of the erbium absorption band in the vicinity of 1530 nm. The optical gain fibers of the present invention have a wider gain window, improved flatness across the gain window, and/or increased gain as compared to conventional optical gain fibers. Accordingly, they are useful in amplifying optical signals, particularly signals which need to be repeatedly amplified over the course of a long-haul transmission, without losses in the signal quality that are commonly encountered in conventional optical signal amplifying methods.
Abstract:
A continuous wave laser device (40) comprises a convoluted path or fibre (43) of Raman laser material that has been micromachined onto a substrate, the laser material fibre being covered by protective cladding (30). A 1 cm diameter substrate can have tens of metres of fibre fabricated on it and with a suitable choice for the laser material, e.g. Diamond, can output tens of hundreds of Watts of laser power. One possible use envisaged is a multicolour laser diodes, for example for projection television systems.
Abstract:
An optical apparatus (100), an optical system (200) and a method (300) of light amplification by stimulated emission employ an endohedral metallofullerene (120, 220) as an active material coupled to an optical waveguide (110, 210). The endohedral metallofullerene (120, 220) is optically coupled to an optical field of the optical waveguide (110, 210). The coupled optical field produces a stimulated emission in the endohedral metallofullerene (120, 220). The optical system (200) further includes an optical source (230) that generates optical power (232) to pump the endohedral metallofullerene (200) to produce a stimulated emission. The method (300) further includes optically pumping (330) the coupled endohedral metallofullerene by introducing an optical pump into the optical waveguide.
Abstract:
An optical fiber amplifier module is disclosed which comprises a signal path located between a signal input and a signal output. A WDM coupler and an amplifying gain medium are disposed along the signal path. A pump laser is disposed out of the signal path in a manner that allows a pump signal from the pump laser to reflect off the WDM coupler and enter the signal path. An embodiment utilizing a second WDM coupler and a second pump laser is also disclosed.
Abstract:
In accordance with the present invention, there is an optical amplifier fiber comprising a core manufactured from a phosphate glass doped with a rare earth element and a cladding manufactured from a phosphate glass surrounding the core. The core has a radiative lifetime in the range of 7 to 9 milliseconds at 1535 nm, a fluorescence lifetime of greater than 7.5 milliseconds at 1535 nm. The optical amplifier fiber has a diameter ratio in the range of 0.036 to 0.044, a transformation point difference of the core and the cladding, measured in (°C), less than 5%. Further, the optical amplifier fiber has a coefficient of thermal expansion, measured in (/°C), difference between the core and cladding is less than 2% and an absorption cross section in the range of 0.60 x 10 m to 0.72 x 10 m , in the range of 1530 nm to 1540 nm.
Abstract translation:根据本发明,存在一种光放大器光纤,其包括由掺杂有稀土元素的磷酸盐玻璃制成的芯和由围绕芯的磷酸盐玻璃制成的包层。 核心在1535 nm处具有7至9毫秒范围内的辐射寿命,在1535 nm处的荧光寿命大于7.5毫秒。 光放大器光纤的直径比在0.036至0.044的范围内,以(℃)测量的芯和包层的相变点差小于5%。 此外,光放大器光纤具有以(℃)测量的热膨胀系数,芯与包层之间的差小于2%,吸收截面在0.60×10 24 m 2的范围内 > 0.72×10 24 m 2,在1530nm至1540nm的范围内。
Abstract:
A slab laser and its method of use for high power applications including the manufacture of semiconductors and deposition of diamond and/or diamond-like-carbon layers, among other materials. A lamp driven slab design with a face-to-face beam propagation scheme and an end reflection that redirects the amplified radiation back out the same input surface is utilized. A side-to-side amplifier configuration permitting very high average and peak powers having scalability is also disclosed. Cavity filters adjacent to pump lamps convert the normally unusable UV portion of the pump lamp spectrum into light in the absorption band of the slab laser, thereby increasing the overall pump efficiency. The angle of the end reflecting surface is changed to cause the exit beam to be at a different angle than the inlet beam, thereby eliminating the costly need to separate the beams external to the laser with the subsequent loss of power.
Abstract:
An optical fiber amplifier module (10) is disclosed which comprises a signal path (30) located between a signal input (12) and a signal output(16). A WDM coupler (50) and an amplifying gain medium (70) are disposed along the signal path (30). A pump laser (60) is disposed out of the signal path (30) in a manner that allows a pump signal from the pump laser (60) to reflect off the WDM coupler (50) and enter the signal path (30). An embodiment utilizing a second WDM coupler and a second pump laser is also disclosed.
Abstract:
A method for selecting laser and pump frequencies for a quasi-two level solid state laser (10) with a selected laser host (12) and operating the laser with the selected laser and pump frequencies, the host (12) having a fluorescence probability P(v) over a frequency range vi to vf, the method has the steps of: determining for the laser host (12), a power weighted average fluorescence frequency given by 1/(vf - vi) times the integral from vi to vf of v*P(v) dv; selecting an output frequency vL for the quasi-two level solid state laser (10) to satisfy the expression vL , and tuning the laser (10) for laser emission at the vL; and selecting the pump frequency vP for the quasi-two level solid state laser (10) to satisfy the expression vL , and optically pumping the laser host (12) with a laser pump (14) to produce laser emission at the vL. This will provide athermal laser operation.
Abstract translation:一种用选择的激光主机(12)为准二级固体激光器(10)选择激光和泵浦频率并以选定的激光和泵浦频率操作激光的方法,所述主体(12)具有荧光概率P (v)在频率范围vi至vf之间,该方法具有以下步骤:确定激光主机(12),由1 /(vf-vi)给出的功率加权平均荧光频率乘以vi的积分 v v p(v)dv; 选择准二级固体激光器(10)的输出频率vL以满足表达式vL ,并调谐激光器(10)以进行激光发射; 并选择准二级固态激光器(10)的泵浦频率vP以满足表达式vL ,并用激光泵(14)对激光器主体(12)进行光泵浦,以产生激光发射 在vL。 这将提供无热激光操作。
Abstract:
A method of manufacturing an optical fiber is provided. The method involves providing a fiber preform with an active core and a pump-guiding cladding, and assembling one or more side rods to the fiber preform. The side rods extend longitudinally along an outer surface of the pump-guiding cladding. The resulting fiber preform assembly is drawn into the optical fiber. Each side rod defines a longitudinal protrusion extending along the optical fiber. Each longitudinal protrusion may have a cross-section forming a middle bump projecting radially away from the outer surface of the pump-guiding cladding and smooth transition regions with this outer surface of the pump-guiding cladding on opposite sides of the middle bump.