74 results about "Diode-pumped solid-state laser" patented technology

A laser system capable of efficient production of high energy sub-nanosecond pulses in the 2-15 μm spectral region is disclosed. Diode pumped solid state lasers are used as pump sources. The system design is simple, reliable and compact allowing for easy integration. The laser system includes a combination of compact solid-state ˜1 micron laser sources, producing high power picosecond pulses, with optical parametric amplification and a quasi-continuous wave laser for seeding the amplification process that enables the efficient conversion of the high power ˜1 micron laser radiation to tuneable mid-infrared sub-ns pulses. New parametric processes are presented for achieving high gains in bulk nonlinear crystals. Furthermore, a method of exceeding the fundamental conversion efficiency limit of direct three wave mixing is presented. The compact and robust nature of this novel laser system opens up the use of high power and high peak power mid-infrared laser pulses to a wide variety of important medical and dental applications.

A method and apparatus for extracting methane gas from methane hydrate. The method includes heating the methane hydrate with a laser apparatus. The laser apparatus includes a diode laser or a solid state laser that is pumped with a diode laser. The laser is guided to a working end of a tool with a fiber optic bundle. The tool is guided to heat the methane hydrate with the laser, which emanates from a beam expander at the working end of the tool. The tool can be modified for removing obstructions of methane hydrate in pipelines. Also, the tool can be modified for extracting methane from mined methane hydrate, which is in a container. The characteristics of diode lasers or diode-pumped solid state lasers such as efficiency, size, nature of operation, environmental impact and durability, make methane gas extraction from methane hydrate economically feasible.

This invention relates to video cameras and, more specifically, to a high-resolution day / night video camera with a long lens, fast optics and pan / tilt / zoom electronics, coupled with a diode-pumped solid state laser illuminator for long range low light illumination. Potential applications include ports, borders, pipelines, power stations, communication transmitters and prisons.

The present invention is directed to systems and methods for dental applications that allow for cost effective, expedient surgical, microsurgical, cosmetic and diagnostics procedures. The system includes a console with no optical connector in it for high optical power and one or more handpiece assemblies detachably connected with the console via electrical connectors. The converter of electrical power to optical power is made as a semiconductor converter, such as a light emitting diode, a diode laser, a diode pumped solid state laser, a diode pumped fiber laser, and the like. The elements of the semiconductor converter in the embodiments of the invention are capable of being positioned in different parts of the handpiece assembly. In one embodiment, the console is adaptive and is capable of executing an executable code stored in a handpiece during its manufacture enabling corresponding performance of the system.

A diode-pumped solid-state laser including a short wavelength (e.g., blue, violet, or UV) semiconductor laser that pumps an absorption transition in a rare-earth-doped material. Responsive to this pumping, the rare-earth active ion directly emits laser radiation. A number of different wavelength outputs, including short wavelengths, are achievable dependent upon the material and the pump wavelength. The gain medium may include an active ion selected from Er3+ Sm3+, Eu3+, Tb3+, Dy3+, Tm3+, Ho3+, and Pr3+. A laser diode pump source has a wavelength in the range of about 365 nm to 480 nm to excite a laser emission in the range of 370 to 800 nm. The laser diode pump source may comprise a GaN-based semiconductor. In some embodiments, the laser diode pump source supplies a pump beam in a range of 370-380 nm, 400-415 nm, 435-445 nm, or 468-478 nm.

A diode-pumped solid-state laser (DPSSL) has self-maintained multi-dimensional optimization. The output property of the DPSSL, including optical power, noise level, and the operation conditions of its individual components, including the drive current and temperature of the laser diode, the temperature of the laser crystals and laser cavity, the drive current of the thermoelectric coolers, is monitored and systematically optimized in real time through automatic electronic control using a microprocessor. Such monitoring and optimization enable the DPSSL to maintain its optimum performance in output power, beam quality, noise level, and stability, throughout its lifetime regardless of component aging and change of environmental conditions. A highly accurate temperature monitoring and control method is also developed.

A method and surgical technique for corneal reshaping and for presbyopia correction are provided. The preferred embodiments of the system consists of a scanner, a beam spot controller and coupling fibers and the basic laser having a wavelength of (190-310) nm, (0.5-3.2) microns and (5.6-6.2) microns and a pulse duration of about (10-150) nanoseconds, (10-500) microseconds and true continuous wave. New mid-infrared gas lasers are provided for the corneal reshaping procedures. Presbyopia is treated by a method which uses ablative laser to ablate the sclera tissue and increase the accommodation of the ciliary body. The tissue bleeding is prevented by a dual-beam system having ablative and coagulation lasers. The preferred embodiments include short pulse ablative lasers (pulse duration less than 200 microseconds) with wavelength range of (0.15-3.2) microns and the long pulse (longer than 200 microseconds) coagulative lasers at (0.5-10.6) microns. Compact diode lasers of (980-2100) nm and diode-pumped solid state laser at about 2.9 microns for radial ablation patterns on the sclera ciliary body of a cornea are also disclosed for presbyopia correction using the mechanism of sclera expansion.

A diode-pumped solid-state laser including a short wavelength (e.g., blue, violet, or UV) semiconductor laser that pumps an absorption transition in a rare-earth-doped material. Responsive to this pumping, the rare-earth active ion directly emits laser radiation. A number of different wavelength outputs, including short wavelengths, are achievable dependent upon the material and the pump wavelength. The gain medium may include an active ion selected from Er3+ Sm3+, Eu3+, Tb3+, Dy3+, Tm3+, Ho3+, and Pr3+. A laser diode pump source has a wavelength in the range of about 365 nm to 480 nm to excite a laser emission in the range of 370 to 800 nm. The laser diode pump source may comprise a GaN-based semiconductor. In some embodiments, the laser diode pump source supplies a pump beam in a range of 370–380 nm, 400–415 nm, 435–445 nm, or 468–478 nm.

The invention relates to a preparation method for a waterproof laser film. According to the requirement in practical application of normal incidence 800nm pumping transmission and back incidence 1064nm fundamental frequency light reflection, an HfO2 and SiO2 film is prepared by a vacuum electron beam evaporation sedimentation technology and is taken as the film which has a large electric filed and is easy to damage due to being close to a base plate when being used as the back incidence, so as to obtain higher laser damage resistance threshold; aiming at the working condition of a water cooling system, for the films close to the water side and easy to be permeated and corroded, Ta2O5 and SiO2 films are prepared by an ion beam auxiliary sedimentation technology, so that the microstructure of the film is improved, higher stacking density is obtained, and good waterproof performance is realized; HfO2, Ta2O5 and SiO2 of high or low refractive index are deposited alternately so as to form a multi-layer film, and the optical thickness of each layer is controlled so as to obtain the needed spectral characteristic. The preparation method can well take advantages of the three characteristics and can apply the characteristics to a neodymium glass substrate of a diode pumping solid laser system, so that the diode pumping solid laser system can work in a water cooing system normally, and has good laser damage resistance performance and the spectral characteristic needed by the system.

A broadband light source device that can generate supercontinuum light in a visible range and having a spectrum with a stable shape and high intensity is provided. The broadband light source device includes a diode-pumped solid-state laser light source that outputs seed light in response to being excited by a laser beam output from a semiconductor laser light source; a wavelength converter that receives the seed light to generate wavelength-converted light having a wavelength different from that of the seed light, and outputs the wavelength-converted light; and a nonlinear medium that receives the wavelength-converted light to generate supercontinuum light having a bandwidth of 100 nm or greater included in a wave band of 400 nm to 700 nm inclusive, and outputs the supercontinuum light.

A diode-pumped solid-state laser oscillator optically pumps a laser medium. The oscillator has at least one pumping light source that emits light in a predetermined wavelength band, and a laser medium that absorbs light in the wavelength band. In the wavelength band, the optical absorption index of the laser medium increases with an increase in wavelength, and the optical radiation energy of the light source decreases with an increase in wavelength. Thus, with respect to wavelength changes, an increase in the optical absorption index is cancelled out by a decrease in the radiation energy, making the stability of the laser output less dependent on the temperature of the optical pumping medium or laser medium.

A diode pumped solid state laser for producing a high aspect ratio beam comprises a diode pumping array (1) on a diode array mount (3) and optical means for imaging a pump light beam onto a substantially asymmetrical spot with a smooth intensity profile. The pump light beam is pumping a laser medium (4). Both the pump and the lasing mode have strong asymmetries. In combination with the right choice of laser medium (4), this results in high power laser performance. The axis of the pump light beam is adjustable by a simple adjusting means (110) to a defined plane or direction relative to a mounting frame (111) of a diode array pumping device (103). The adjusting means (110) compensates small tolerances on mounting of the diode array (1) and / or at least one optical element (2). The adjusting means include at least one wedged window (127). Because of this adjustment the axis of the light beam lies in a defined plane relative to the mounting frame (111) of the pumping device (103). Therefore the diode array pumping device (103) of a laser is replaceable without any further adjustment.

A temperature insensitive diode-pumped solid state laser is disclosed in this invention. The components of the laser are optimized with temperature insensitive design, making the laser capable of operating in a wide temperature range without using any cooling / heating system to maintain the temperature of its components.

A rugged resonator for a laser includes a laser pump housing. An X-fold resonator assembly is configured to receive and hold the laser pump housing. The resonator includes at least four mirrors, a first, a second, a third, and a fourth mirror. The first mirror is configured to receive a first incident laser beam from the first end and to reflect a first reflected beam to reflect as a third reflected beam from the third mirror. The second mirror is configured to receive a second incident laser beam from the second end and reflecting a second reflected beam to intersect the first reflected beam and to reflect as a fourth reflected beam from the fourth mirror. An optical coupler is affixed to an optics plate and configured to receive the third reflected beam. A high reflector is affixed to the optics plate and configured to receive the fourth reflected beam.

The invention discloses a diode pumped solid state laser (DPL) and a debugging method therefor. The diode pumped solid state laser comprises a semiconductor pumping source, a coupling system, laser crystals, a bi-color plano-convex cylindrical surface totally-reflecting mirror, reflecting laser, a polarizing film, a quarter-wave plate, a pockels cell, and a plano-concave cylindrical surface output mirror, wherein the semiconductor pumping source is used for outputting pumping light; the coupling system is used for transmitting and homogenizing the pumping light, and coupling the pumping light into the laser crystals; the laser crystals are used for providing gain; the bi-color plano-convex cylindrical surface totally-reflecting mirror is arranged between the coupling system and the laser crystals and used for transmitting the pumping light and reflecting laser; the polarizing film is used for polarizing the laser; the quarter-wave plate is used for rotating the polarization direction of the passed laser for 45 degrees; when the pockels cell is not applied with voltage, the pockels cell is equivalent to a plain film; when the pockels cell is applied with quarter-wave voltage, the pockels cell is equivalent to the quarter-wave plate; and the plano-concave cylindrical surface output mirror is used for outputting laser. According to the diode pumped solid state laser provided by the invention, the repetition frequency of the pumping light is improved, the pumping light interval is shortened, the power density of the pumping light is improved; and in addition, the diode pumped solid state laser is small in divergence angle, so that the ranging or imaging distance is improved, and the application range is expanded.

The invention relates to direct fiber coupling technology with high laser outputting efficiency, in particular to a fiber coupling method for a diode pumping solid-state laser, which is characterized in that a laser output mirror of the diode pumping solid-state laser is a compound mirror (2); the compound mirror (2) is a plano-convex lens; the plane end of the compound mirror (2) is used as an output mirror of a resonant cavity and is plated with a plane end coating film (7) of a reflecting film of laser wavelength; the convex face end is plated with a convex face end coating film (8) of an anti-reflection film of the laser wavelength, and focuses transmission light; the convex face end of the compound mirror (2) is in light connection with a coupling fiber (3); and focal spot focused by an output ray beam of the laser is less than a fiber core, and a divergence angle is less than twice numerical aperture of the coupling fiber (3). Because the compound mirror replaces the output mirror and a coupling lens of a diode pumped solid-state laser, the method greatly simplifies the structure, and makes the operation simple and convenient. The use of the compound mirror solves the problem that the coupling lens cannot be in close proximity to the output mirror, achieves the zero distance of theory limit, reduces the requirements on the numerical aperture and effective clear aperture and facilitates obtaining of high fiber coupling efficiency.

The invention discloses a high-efficiency mixed light source for miniature illumination. The high-efficiency mixed light source comprises a diode pumped solid-state laser (DPL) light source, a DPL shaping lens group, a laser diode (LD) light source, an LD shaping lens group, a light converging mirror A, a light emitting diode (LED) light source, an LED shaping lens group and a light converging mirror B, wherein the DPL light source transmits green laser and outputs the green laser to the light converging mirror A through the DPL shaping lens group; the LD light source transmits red laser and outputs the red laser to the light converging mirror A through the LD shaping lens group; the green laser and red laser in the light converging mirror A are converged and superposed and are output to the light converging mirror B; the LED light source transmits blue laser and outputs the blue laser to the light converging mirror B through the LED shaping lens group; and the light output by the light converging mirror A in the light converging mirror B and the blue laser are converged and superposed, and the light is output. According to the high-efficiency mixed light source, the blue light ratio is small, a single single-color LED is used for illumination, and compared with the traditional LED array, the high-efficiency mixed light source has the advantages that the size is small under the condition that the micro projection illumination requirement is met, and meanwhile the radiating problem in a miniature illumination system is solved.

A solid-state laser device consists of a gain medium in the shape of a polyhedron. A beam enters the gain medium at one surface of the polyhedron and is reflected internally at one or more surfaces with each reflection occurring in approximate the same plane as the plane of incidence of the incident beam. The beam enters and exits the gain medium at different locations. Pump radiation enters the polyhedron through one or more faces. The laser device may be used as the gain medium for a laser oscillator or a laser amplifier. In one variation, the polyhedron contains an internal core section in which there is no gain material. In another variation, the gain medium further includes one or more surfaces oriented to achieve a 90 degree internal reflection of the beam.

The present invention relates to the structure design of semiconductor side pumping solid laser gyroscope. The gyroscope consists of mainly circular cavity reflector combination, gain medium, pumpingunit, electrooptical crystal, beam splitting plate, optical delayer and readout circuit. It features its side pumping comprising focusing and coupling lens, semiconductor laser array and temperature controller. The present invention has less heat stress, triangular circular cavity, without negative area and structure similar to that of gas laser gyroscope. It has two electrooptical crystals in the same parameters for electrooptical jetter and uses sinusoidal waves with 180 deg phase difference for modulation to reduce blocket area. The present invention has advantages of small volume, stable work and long service life, and may be used widely in inertial navigation, inertial guidance, inertial measurement and other inertial technology.

A diode pumped solid state laser using a laser diode bar or a stack of bars with cylindrical lenses is used to end pump a rectangular cross section solid state laser slab. The combination of lenses and polished slab surfaces provides overlap of the pump light with the laser mode combined with sufficient length of material to absorb all of the pump light to produce a compact, efficient laser source.

The invention discloses a laser long-distance wireless charging device based on a rotating emission lens. The device uses a method of controlling the laser output direction by controlling the reflection angle of a mirror instead of laser movement in the prior art. The motor load and power consumption are reduced, the laser control precision is increased, and the size and weight of the laser long-distance wireless charging device based on a rotating emission lens are reduced. With laser as a carrier, the device has the characteristics of long transmission distance, high transmission efficiency, small receiver size, high charging speed and efficiency, adaptability to small electronic equipment, and the like. The beam density and wavelength of an 808nm semiconductor laser and a 1064nm diode pump solid-state laser adopted by the device match the energy gap width of gallium arsenide (GaAs) and indium gallium arsenic (InGaAs) photocell panels respectively. The device has the characteristics of high photoelectric conversion efficiency and low heat loss.

The invention provides a solid laser, which comprises a semi-conductor laser planer array which is used to output pump light and is formed by a plurality of semi-conductor lasers, an optical coupled device which is used to couple the pump light, a resonant chamber which can output laser in parallel which is input in parallel and a laser crystal which is arranged in the resonant chamber. The invention proposes an innovative idea of simultaneously applying a plurality clusters of parallel solid laser, which effectively achieves the output of semi-conductor pump solid laser in high efficiency and big power in some extent in the parallel output mode of a plurality clusters of solid laser. The solid laser can achieve high-efficiency output through utilizing the combination of multipath lower-power laser, compared with a single semi-conductor pump solid laser, the solid laser can excellently achieve thermal dispersion since the beam-splitting output of pump light under the premise of the same output power, can reduce heat load of crystal, effectively solve the problem of thermal effect of laser crystal, and improve electro-optical conversion efficiency and the flexibility of the resonant chamber design.

The present invention relates to the structure design of semiconductor pumping solid laser. By means of the slit or pinhole between the concave mirror light path and the plane mirror light path or between two plane mirror light paths and the Fabry-Perot interferometer, the present invention limits the size of bi-directional laser beam inside the cavity to make the laser output fundamental transverse mode, and modulate the bi-directional fluorescence inside ring cavity to make different longitudinal mode fluorescence produce different loss, so that the longitudinal mode fluorescence with low loss forms single longitudinal mode laser output. The present invention realize single transverse mode and single longitudinal mode output of bi-directional solid ring laser with simple optical path structure, small single mode energy loss and great output power.