Abstract:
A planar waveguide (PWG) having a first end for coupling to a light pump and a second end opposite to the first end and including: a first cladding layer; a uniformly doped core layer having the first cladding layer on one side, wherein the core layer is tapered having a smaller thickness at the first end and a larger thickness at the second end; and a second cladding layer thinner than the first cladding layer, coated on another side of the core layer opposite to said one side of the core layer. The first cladding layer may also be tapered along the length of the PWG having a larger thickness at the first end and a smaller thickness at the second end with a taper angle substantially opposite that of the core layer to form the PWG with a substantially uniform overall thickness along the length.
Abstract:
Bei einer Anordnung mit einem verstärkenden Lasermaterial (1) und einer Kühleinheit (7), die einen Hohlraum (13) zur Aufnahme zumindest eines Teils des Lasermaterials (1) besitzt, befindet sich in einem Spalt zwischen dem Lasermaterial (1) und der Kühleinheit (7) ein zumindest im Betrieb der Anordnung flüssiges Metall (21) zur Wärmeübertragung von Wärme vom Lasermaterial (1) auf die Kühleinheit (7). Vom das Lasermaterial (1) aufnehmenden Hohlraum (13) führt mindestens ein Kanal (14) weg, in dem sich zumindest in einem an den Hohlraum (13) anschließenden Endabschnitt (22) ein zumindest im Betrieb der Anordnung flüssiges Metall (21) befindet.
Abstract:
A monolithic, side pumped solid-state laser (1) comprising a laser resonator structure (3) comprised of a laser gain medium (2) having a longitudinal axis (L), wherein the laser resonator structure (3) comprises end faces (4) forming a linear optical path resonant cavity there between, at least one of the end faces (4) comprising at least partially reflecting laser mirrors (4a, 4b) in particular deposited thereon, the laser gain medium (2) comprising a side face (2a) for receiving pump light (5a) of a pump source (5), wherein the pump light (5a) is generated by a diode laser (5), and comprising a conductive cooler (6) comprising contact faces (6c) contacting the laser gain medium (2), and comprising a reflector (7) arranged opposite to the side face (2a) with respect to the longitudinal axis (L), wherein the laser gain medium (2) is a low gain material.
Abstract:
A method includes obtaining (1402) a substrate (102, 202) having at least one exposed metal surface. The method also includes electro-depositing (1408) metal (108, 208b) onto the at least one exposed metal surface of the substrate and around at least a portion of an optical fiber (104, 204) to secure the optical fiber to the substrate. The substrate and the electro-deposited metal are configured to remove heat from the optical fiber. The method could further include electro-depositing (1404) metal (208a) around a sacrificial material (203) and removing (1410) the sacrificial material to form at least one cooling channel (210) through the electro-deposited metal. The optical fiber could include a polymer coating (506), where a portion (508) of the polymer coating is removed at an end of the optical fiber. The substrate and the electro-deposited metal could be faceted at an input (402) of the optical fiber and at an output (404) of the optical fiber. The optical fiber could have a coiled arrangement on the substrate.
Abstract:
Stimulating emission via thulium's lasing transition from the 3 H 4 manifold to the 3 H 6 manifold yields light at wavelength of about 820 nm. Unfortunately, excited thulium ions also transition from the 3 H 4 manifold to the long-lived 3 F 4 manifold, where they become trapped and can no longer participate in the lasing transition. If the enough of the thulium population becomes trapped in the 3 F 4 manifold, the gain medium becomes transparent at the pump wavelength, rendering population inversion difficult or impossible. Fortunately, the size of the population in the 3 F 4 manifold can be limited by selecting an appropriate crystal host and thulium doping concentration, pumping the thulium with pulses shorter than the 3 F 4 manifold's lifetime, cooling the gain medium to low temperature (e.g., 77 K), stimulating emission from the 3 F 4 manifold, upconversion pumping of the thulium from the 3 F 4 manifold to the 3 H 4 manifold, or transferring energy from thulium in the 3 F 4 manifold to a co-dopant.
Abstract:
The invention relates to a device for amplifying a multi-wavelength pulse laser beam (2), which includes: a solid amplifier medium (1) having two planar surfaces, a front surface (12) and a reflective rear surface (11), a device for cooling the amplifier medium (1) via the rear surface (11) thereof. The front surface (12) of the amplifier medium (1) is inclined relative to the rear surface (11) of same by a first non-zero angle, and the device further includes a trapezoidal prism (4), having an input surface and an output surface which together form a second non-zero angle, the first and second angles being such that the beams of each wavelength are parallel to one another upon exiting the prism (4).
Abstract:
The present invention relates to an optically pumped solid state laser device, comprising one or several solid state laser media (100) in a laser resonator and one or several pump laser diodes (200) and pump radiation reflecting mirrors (300). The laser resonator is formed of one or several first resonator mirrors arranged at a first side of the solid state laser media(100) and one or several second resonator mirrors (310, 320, 330) arranged at a second side of the solid state laser media (100). The first and second resonator mirrors are arranged to guide laser radiation (500) on at least two different straight paths through each of said laser media (100). The pump laser diodes (200) are arranged to optically pump the solid state laser media (100) by reflection of pump radiation (510) at said pump radiation reflecting mirrors (300). The pump radiation reflecting mirrors (300) and the second resonator mirrors (310, 320, 330) are integrally formed in a single mirror element (600). With this design of the solid state laser device an easy alignment of the pump optics and an enhanced gain of the laser device are achieved. The proposed solid state laser device can be realized in a compact form.