158 results about "Waveguide lasers" patented technology

A method of producing an active optical waveguide having asymmetric polarization, said method comprising the steps of (a) providing an active optical waveguide (10) comprising: (i) a transverse refractive index profile (21) comprising a guiding region (11), an intermediate region (13), and a non-guiding region (12); (ii) a transverse photorefractive dopant profile (31) comprising a constant or graded photorefractive dopant concentration within at least one of the guiding, non-guiding and intermediate regions, except that the photorefractive dopant is not located solely in the guiding region; and (iii) exhibiting in said guiding region, intermediate region, or both, light guiding modes having different polarizations; and (b) exposing at least a part (10a, 10b) of the active optical waveguide to an effective transverse illumination of light (20) reacting with the photorefractive dopant and modifying said transverse refractive index profile; said part of the active optical waveguide being exposed to a fluence selectively suppressing the propagation of the light guiding modes having different polarizations so that the propagation of one mode is less suppressed than the propagation of the other mode(s). Such an active optical waveguide, single polarization mode optical waveguide lasers and multi-wavelength single polarization mode optical waveguide lasers comprising such an active optical waveguide, methods of their production, and their uses in telecommunications, in spectroscopy, in sensors and in absolute calibrated laser light sources.

The invention describes a method of single-transverse-mode generation for waveguide lasers of various kinds having a large cross section of their active core and thus providing a possibility of efficient pump of the active core region. This results in a laser beam with enhanced power and high spatial quality for high efficiency coupling to standard single-mode optical fiber networks. It is found that a multimode waveguide having a central dip of special shape in the refractive index profile of its core is able to guide a higher order mode with sharp central peak of its field carrying the considerable part on the mode energy and whose width is well compatible with the width of the fundamental mode of standard single-mode fibers. The useful properties of this higher order mode can be employed to provide the single-transverse-mode regime of generation in optical fiber lasers, integrated optical micro-lasers and various semiconductor laser sources.

A frequency comb laser providing large comb spacing is disclosed. At least one embodiment includes a mode locked waveguide laser system. The mode locked waveguide laser includes a laser cavity having a waveguide, and a dispersion control unit (DCU) in the cavity. The DCU imparts an angular dispersion, group-velocity dispersion (GVD) and a spatial chirp to a beam propagating in the cavity. The DCU is capable of producing net GVD in a range from a positive value to a negative value. In some embodiments a tunable fiber frequency comb system configured as an optical frequency synthesizer is provided. In at least one embodiment a low phase noise micro-wave source may be implemented with a fiber comb laser having a comb spacing greater than about 1 GHz. The laser system is suitable for mass-producible fiber comb sources with large comb spacing and low noise. Applications include high-resolution spectroscopy.

An optical device (10) includes a broad area laser (72) for lasing at a first wavelength (64), a multimode active-doped tapered waveguide laser (6); and a multimode passive planar mode transformer (118) coupling and tapering from the broad area laser (72) to the multimode active-doped tapered waveguide laser (6).

A pulsed, Q-switched, waveguide CO2 laser includes a plurality of waveguide channels formed in a block of a beryllium oxide ceramic material and is operated at a wavelength between about 9.2 and 9.7 micrometers. The laser has an output power up to 55% greater than that of a similarly configured laser, operated at the same wavelength and pulse conditions, but wherein the waveguide channels are formed in a block of an alumina ceramic material.

A monolithic ceramic waveguide laser body is made by forming and grinding two or more plates of alumina ceramic to produce internal and external features otherwise impossible to fabricate in a single ceramic body. The plates are bonded together by use of glass frit or by self-friting (diffusion bonding) methods to achieve a vacuum tight enclosure. The ceramic surfaces to be bonded have an "as ground" finish. One internal structure created by this method includes a channel of dimensions from 8 to 1.5 mm square or round that confines an RF or DC electrical discharge and comprises a laser resonator cavity. The channel can be ground to form a "V", "U" or "Z" shape folded cavity. Another internal structure is a gas reservoir connected to the resonator cavity. Various other important features are described that can only be created by this method of building a laser. The plates are bonded together in a furnace at temperatures ranging between 450° C. and 1700° C., depending on the method used.

The invention relates to a system comprising a waveguide laser for exciting laser light at a lasing wavelength λ_s and a pump for pumping the waveguide laser at a pumping wavelength λ_p. The invention further relates to a method of providing such a system and its use. The object of the present invention is to provide a system comprising a waveguide laser with a reduced phase noise. The problem is solved in that the pump is a single frequency laser. The invention may e.g. be used in systems where an ultra-low phase noise and/or linewidth is required, e.g. in LIDAR or interferometric systems.

A planar waveguide with a glass core and a crystalline cladding. In a specific embodiment, the core is doped preferably with Neodymium, Ytterbium, or Erbium. In the best mode, the core is athermal glass with a refractive index uniformity 10⁻⁶ or better and the crystalline cladding has a refractive index lower than that of the core by 10⁻⁴ to 10⁻³ with a refractive index uniformity of 10⁻⁴. The cladding has high transparency at pump and lasing wavelengths. The coefficient of thermal expansion of the cladding is close to that of the core. In illustrative embodiments, the cladding is Sapphire and the core is aluminate glass. In an alternative embodiment, the cladding is crystal quartz and the core—is phosphate glass. By utilizing different materials for the core and cladding, the properties of each are optimized. Use of glass for the core allows much more flexibility in tailoring the properties of the core and the PWG geometry readily accommodates the low thermal conductivity of a glass core because the overall thermal performance is dominated by the higher thermal conductivity of the crystalline cladding.

The invention relates to the field of laser technologies and micro-nano optoelectronics and discloses an asymmetric metal grating and coating semiconductor multi-quantum-well waveguide laser. The waveguide laser comprises an upper metal grating layer (1), an active layer (2), a lower metal coating layer (3) and a substrate (4). The optical field is locally limited in the semiconductor active layer effectively through the upper metal grating layer and the lower metal coating layer. One-dimensional strip-shaped metal gratings are manufactured on the upper metal grating layer, FP-cavity-like resonance is formed in combination with local area surface plasma resonance, and thus wavelength mode can be effectively selected. The active layer is made of multi-quantum-well high-gain material, pump light is effectively absorbed and target light is sufficiently fed back through strong resonance between the pump light and the target light, and finally low-threshold laser emitting is achieved. The waveguide laser has the advantages of being capable of limiting one-dimensional sub-wavelength of light, good in unidirectionality and the like.

The disclosed Ga-Ge-Bi-Pb fluorescent glass material doped with rare earth is prepared by: mixing and fusing the Ga2O3, Bi2O3, GeO2, lead-contained compound and rare earth compound to obtain the fused glass liquor; clearing and pouring the liquor into the mold to obtain the glass; putting the glass rapidly into a muffle furnace with temperature as the glass transformation temperature for heat preservation; finally, cooling to room temperature. This product can be manufactured into different shape, and has wide application as the gain medium.

A waveguide laser is formed by starting with a glass disc doped with a rare earth element to define a lasant material. The disc is etched or machined to define an elongated waveguide channel having a spiral configuration. The open area between the walls of the waveguide channel is filled with a cladding material. An end reflector is formed on the radial inner end of the spiral waveguide. First cladding layers are formed on both sides of the spiral waveguide. A second cladding layer is deposited on at least one of the first cladding layers. A heat sink is connected to the second cladding layer. A plurality of optical pump sources are positioned about the side walls of the structure to excite the lasant material and generate a laser beam. In one preferred embodiment, the side walls of the structure are provided with a convex configuration to enhance pump coupling.

The invention relates to the laser filed, in particular an optical waveguide laser, an optical waveguide amplifier and a manufacturing method thereof. A laser gain medium sheet or a laser gain medium sheet stuck with an underlayer together is manufactured through a plurality of times of optical processing, cutting and polishing; and the gain medium sheet is stuck with an underlayer material together through agglutination, optical cementing or deep agglutination method. The laser gain medium is processed to form a waveguide laser gain medium cavity of which four sides are wrapped with an adhesive layer or a deep optical cementing layer through a plurality of times of optical processing and agglutination; and the end face of the waveguide laser gain medium cavity is an optical surface and is plated with a laser cavity film layer, thereby forming the laser or the amplifier with a waveguide structure. The waveguide cavity structure provides a method which can reduce a threshold value and can obtain laser through low-power pumping for various laser gain materials with high threshold values. The method for manufacturing the waveguide cavity has a simple process and is suitable for large-scale popularization.

Certain example embodiments of this invention relate to waveguide lasers (e.g., RF-excited waveguide lasers). Certain example embodiments of this invention provide combined waveguide cover and non-coupled top electrodes, and/or heat load balancing vacuum vessels including multiple (e.g., two or more) chambers. In certain example embodiments, RF energy may couple through the combined waveguide cover and non-coupled top electrode without significantly traversing the insulating carrier material via one or more cutouts or gaps formed in the RF coupling region of the top (or even a bottom) electrode. In certain example embodiments, first and second chambers of the vacuum vessel may be arranged so that heat generated in the discharge region flows away from the first and second chambers, thereby reducing thermally induced distortion of the optical component during laser operation. These techniques may be used alone or in various combinations.

The invention relates to an optical waveguide laser comprising a) an active region formed over a length of the optical waveguide, comprising an excitable material emitting light in response to stimulation by pump light thereby defining an optical gain profile and the excitable material comprises Tm; b) a frequency discriminated feedback element adapted to select a single longitudinal lasing mode by coordination with the frequency response of the optical gain of the excitable material; and c) a polarisation asymmetry element adapted for selecting a single polarisation mode of a given longitudinal mode by selectively suppressing propagation of the other polarisation mode of said longitudinal mode. The object of the present invention is to provide relatively simple, compact and economic lasers for single-frequency operation in the wavelength range of 1.7 um to 2.2 um; in particular for a number of applications, including spectroscopy and for eye-safe optical sources in sensing and in LIDAR, etc.

The present disclosure relates to a method for integrating a sub-micron III-V waveguide laser on a semiconductor photonics platform as well as to a corresponding device/system. The method comprises providing on a semiconductor substrate an electrically insulating layer, etching a trench having a width in the range between 50 nm and 800 nm through the electrically insulating layer, thereby locally exposing the silicon substrate, providing a III-V layer stack in the trench by local epitaxial growth to form a channel waveguide, and providing a light confinement element for confining radiation in the local-epitaxial-grown channel waveguide.

A planar waveguide laser device forms a waveguide by a plate-like laser medium having birefringence and clad attached to at least one of the surfaces of the laser medium perpendicular to its thickness direction, amplifies laser light by a gain produced by excitation light incident on the laser medium, and performs laser oscillation. The laser medium is formed of a material having an optic axis on a cross section perpendicular to the light axis, which is the laser travelling direction. The clad is formed of a material having a refractive index in a range between refractive indexes of two polarized lights that travel along the light axis in the laser medium and have oscillation surfaces that are orthogonal to each other. The planar waveguide laser device readily oscillates linearly polarized laser light.

The invention discloses a rotary adjustable water waveguide laser processing device relating to a laser processing device. The rotary adjustable water waveguide laser processing device is provided with a laser, an inverted telescope, a lens cone, a pipe joint, a pressing sheet, flat glass, a water cavity, a first reflecting mirror, a focusing lens, a nozzle body, a positioning mortise and tenon, a compression screw, a nozzle fixing frame, a bracket, a water collector, a clamp, a numerical control platform, a camera, a water circulating device, a data acquiring, processing and controlling computer, an observation laser and a second reflecting mirror. When different processing zones are selected, light path adjusting links can be reduced, thus the efficiency is increased; the technical problems of narrow processing range and low efficiency in the background art part can be solved; the poor processing flexibility and other defects can be overcome; and in a cavity with a certain pressure for the equipment, stable water waveguide jet flow processing can be formed and laser can be guided to a laser region through water waveguide, thereby the application field can be widened and the efficiency can be increased to the greater degree.