94results about How to "Improve output beam quality" patented technology

A monolithic passively Q switched microlaser includes an optically transparent heat conductive element bonded to a gain medium, which is in turn bonded to a saturable absorber, which may also be bonded to a second optically transparent heat conductive element. Only the gain medium and saturable absorber are disposed within the laser resonator.

The invention discloses a meta-material film for left-hand circular polarization conversion. The meta-material film has a meta-material structure at an optical frequency and comprises metal microstructure layers 1, 3 and a medium substrate layer 2. The metal microstructure layers 1, 3 are positioned on two surfaces of the medium substrate layer 2. The upper surface of the metal microstructure layer 1 is a metal surface 1, and the lower surface of the metal microstructure layer 1 is a metal surface 2. The upper surface of the metal microstructure layer 3 is a metal surface 2, and the lower surface of the metal microstructure layer 3 is a metal surface 4. The metal surface 1 is an incidence plane, and the metal surface 4 is an emitting surface. The metal microstructure layers 1, 3 are of a right-handed rotation windmill structure of chiral symmetry or a spiral right-handed rotation artificial structure of chiral symmetry. A left-handed rotation angle taking a structural center as a rotation center is arranged between the metal microstructure layer 1 and the metal microstructure layer 3. Two orthogonal components of an output light wave are identical in amplitude, and a phase difference between the two orthogonal components is odd times of 90 DEG. The structure is simple, the conversion efficiency is high, a beam of linearly-polarized light can be converted into left-hand circular polarization light, and the output beam is high in quality.

The invention discloses a right-hand circularly-polarized conversion meta-material film which is an optical frequency band meta-material structure. The right-hand circularly-polarized conversion meta-material film comprises metal micro structure layers 1,3 and a medium substrate layer 2; the metal micro-structure layers 1,3 are arranged on two sides of the substrate layer 2; the upper surface of the metal micro-structure layer 1 is a metal surface 1 and the lower surface is a metal surface 2; the upper surface of the metal micro-structure layer 3 is a metal surface 3 and the lower surface is a metal surface 4; the metal surface 1 is an incident surface, and the metal surface 4 is an output surface; the metal micro-structure layers 1,3 are levorotation windmill structures which are chirally symmetric or spiral levorotation artificial structures which are chirally symmetric; an angle to right with the structure center as a rotation center is formed between the metal micro-structure layer 1 and the metal micro-structure layer 3; and the amplitudes of two orthogonal components of the output light wave are equal, and the phase difference of two orthogonal components is odd-number times of the 90 degrees. The right-hand circularly-polarized conversion meta-material film is simple in structure and high in conversion efficiency, can convert one polarized light beam to right-hand circularly polarized light and is high in output light beam quality.

The invention discloses a longitudinal spiral mode transfer optical fiber, which comprises a fiber core, a cladding and a coating layer; a silica material is taken as a substrate by the fiber core, and comprises at least one active ion and a co-doping agent; a plurality of side cores which surround the fiber core and are distributed in a longitudinal spiral structure are arranged in the cladding; the silica material is adopted by the side cores; each core diameter is at the micron dimension; the spiral cycle is at the millimeter dimension, and the edge-to-edge offset of the side core at the innermost layer and the edge-to-edge offset of the fiber core are at the micron dimension. According to the longitudinal spiral mode transfer optical fiber disclosed by the invention, as the spiral side cores with a loss mechanism are added to the cladding, the spiral side cores can be coupled with a higher order mode in the fiber core, and high loss is provided, and therefore single mode optical fiber transfer of large mode area is realized, and a new way is provided for the development of a high-power fiber laser.

The invention discloses a laser resonant cavity with an annular and a concave output mirror, which comprises a reflecting mirror, a laser medium and an output mirror; the output mirror is an annular concave mirror of which the working surface comprises one or a plurality of homocentric, annular and circular arc shaped concave cambers; the central part of the working surface of the output mirror can also be a circular working surface or the central part of the out mirror can be non-working surface or hollowness; an annular and concave reflecting mirror can also be adopted by the laser resonant cavity of the invention. The laser resonant cavity provided by the invention has the advantages of simple processing, convenient adjustment, steady operation, large available mode volume, very small divergence angle and good beam quality, thus being able to be applicable to gas lasesr or solid lasers with medium and high power, in particular to large volume gain medium and cylindrical and toroidal gain medium.

A large-mode-area (LMA) optical fiber (10) that operates as a single-mode optical fiber. The optical fiber includes a core region (20) surrounded by an inner cladding (32), which in turn is surrounded by an outer cladding (40). The inner cladding includes at least one up-doped ring region (32R1). The ring region is configured to form a large attenuation differential between the higher-order modes and the fundamental mode so only that the fundamental mode remains traveling in the optical fiber. If necessary, the optical fiber can include a bend (10B) having a select “resonant” bend diameter (DB) that increases the relative attenuation of the fundamental and higher-order modes. The optical fiber supports an effective mode field diameter (MFD) of up to 40 μm to 50 μm. As a result, detrimental non-linear effects are suppressed, which allows the optical fiber to carry substantially more optical power than conventional LMA optical fibers. The LMA optical fiber is thus eminently suited for a number of optical-fiber-based applications calling for high optical power, such as fiber lasers and pump sources for wavelength conversion.

The invention discloses a multi-stage taper optical fiber phase conjugation mirror and a device and method for laser double-journey amplification of the multi-stage taper optical fiber phase conjugation mirror. The device for laser double-journey amplification comprises a laser, a first polarizing film, a lambada / 2 wave plate, a Faraday magnetic rotation device, a second polarizing film, a laser amplifier, a lambada / 4 wave plate, a first lens, a second lens and multi-stage taper optical fibers, wherein the laser, the first polarizing film, the lambada / 2 wave plate, the Faraday magnetic rotation device, the second polarizing film, the laser amplifier, the lambada / 4 wave plate, the first lens, the second lens and the multi-stage taper optical fibers are sequentially placed in the optical axis direction. The first lens is a convex lens, the second lens is a concave lens, a telescope system is formed by the first lens and the second lens, the focal length f1 of the first lens ranges from 100mm to 1000mm, and the focal length f2 of the second lens ranges from -20mm to -1000mm; the distance D1 between the first lens and the second lens satisfies the equation that D1=f1+f2, wherein the D1 ranges from 20mm to 1000mm. The multi-stage taper optical fiber phase conjugation mirror is high in damage threshold, low in stimulated brillouin scattering threshold, high in reflectivity and wide in dynamic working range, therefore, the conjugation mirror is applied to a high-power laser, and damage is avoided.

The invention discloses a low-loss bending-resistant fiber to the home. The low-loss bending-resistant fiber to the home is characterized in that a rare-earth-doped fiber core is adopted, an inner cladding layer and an outer cladding layer are formed on the surface of the rare-earth-doped fiber core from interior to exterior, and a primary coating layer, a buffering layer, a secondary coating layer and an outer protection layer are arranged on the surface of the cladding layer from interior to exterior in sequence. The low-loss bending-resistant fiber to the home is simple in structure, the transmission loss is effectively reduced, the brittleness of the fiber is improved, the bending performance of the low-loss bending-resistant fiber to the home is good, the low-loss bending-resistant fiber to the home can be directly arranged in the fields of indoor parts, electric control cabinets, ship electric devices and the like, and wiring connection is flexible and convenient.

An apparatus for producing coherent, continuous wave, ultraviolet light, includes one or more source lasers in the visible or near-infrared frequency range. The apparatus also includes one or more frequency conversion stages. Each of the one or more frequency conversion stages includes one or more reflectors, an optical resonator, one or more waveguide components, or one or more fiber optic components. At least one of the one or more frequency conversion stages includes a huntite-type aluminum double borate nonlinear optical material to produce light having a wavelength between 190 and 350 nm. The huntite-type aluminum double borate material has a composition given by MAl3B4O12, where M is one or a plural combination of elements {Sc, La, Y, or Lu}.