265 results about "Fiber disk laser" patented technology

A fiber laser cavity that includes a laser gain medium for receiving an optical input projection from a laser pump. The fiber laser cavity further includes a positive dispersion fiber segment and a negative dispersion fiber segment for generating a net negative dispersion for balancing a self-phase modulation (SPM) and a dispersion induced pulse broadening/compression in the fiber laser cavity for generating an output laser with a transform-limited pulse shape wherein the laser gain medium further amplifying and compacting a laser pulse. The gain medium further includes a Ytterbium doped fiber for amplifying and compacting a laser pulse. The fiber laser cavity further includes a polarization sensitive isolator and a polarization controller for further shaping the output laser.

An optically active fiber (30) is disclosed for making a fiber laser (18) or an amplifier (16). This double-clad structured active fiber (30) has a core (34), doped with an optically excitable ion having a three-level transition. The core (34) has a core refractive index and a core cross-sectional area. An inner cladding (32) surrounds the core (34). The inner cladding (32) has an inner cladding refractive index less than the core refractive index, an inner cladding cross-sectional area between 2 and 25 times greater than that of the core cross-sectional area, and an aspect ratio greater than 1.5:1. An outer cladding (36) surrounds the inner cladding (32) and has an outer cladding refractive index less than the inner cladding refractive index.

An improved method and apparatus for mode-locking a fiber laser at a pre-selected frequency wherein a doped fiber segment contains a narrowband FBG and an electro-optically tuned FBG, thereby making obsolete the need for an EOM to modulate the laser's wavelength. The present invention also provides a method and apparatus for mode-locking a fiber laser at a variable frequencies wherein a doped fiber segment contains two electro-optically tuned FBG's. The electro-optically tuned FBG may be fabricated by a thermal poling process.

This invention discloses to a type of fiber gas lasers and fiber ring laser gyroscopes based on these fiber gas lasers. The fiber gas lasers comprise of excitation gases, optical resonator and excitation source, etc. The optical resonator is made by connecting two selected arms of a single mode fiber coupler to the two ends of hollow-core fiber to form a ring resonator. The hollow-core of the fiber is filled with excitation gases to act as gain medium. The fiber laser is simple to construct, lower cost, and has adjustable size and good amplification performance. The fiber ring laser gyroscopes based on this novel type of gas lasers can be applied on robotics, automobile navigation, etc.

An optical source capable of enhanced scaling of pulse energy and brightness utilizes an ensemble of single-aperture fiber lasers as pump sources, with each such fiber laser operating at acceptable pulse energy levels. Beam combining involves stimulated Raman scattering using a Stokes' shifted seed beam, the latter of which is optimized in terms of its temporal and spectral properties. Beams from fiber lasers can thus be combined to attain pulses with peak energies in excess of the fiber laser self-focusing limit of 4 MW while retaining the advantages of a fiber laser system of high average power with good beam quality.

The invention belongs to the technical field of photoelectric equipments, in particular to a device capable of generating various optical solitons. The optical soliton generation device based on a passive mode-locked ytterbium-doped fiber laser comprises a polarization controller (1), a 1*N optical switch (2), an optical fiber group (3), a 1*N optical coupler (4), a dispersion compensation fiber (5), an optical isolator (6), a ytterbium-doped fiber, a light wavelength division multiplexing (8), a pump light source (9), a saturable absorber (10) and a 1*2 optical coupler (1). In the same passive mode-locked ytterbium-doped fiber laser system, the optical soliton generation device based on the passive mode-locked ytterbium-doped fiber laser is capable of obtaining parabolic dissipative soliton single-pulse optical solitons, hyperbolic secant-shaped soliton single-pulse optical solitons, bounded multi-soliton optical solitons of the two optical pulses and other optical solitons; when switching between different types of solitons, a user does not need to change a light path structure, and the switching speed is very fast.

The invention discloses a totally positive dispersion cavity mode-locked all-fiber laser which is a fiber laser structure with high repetition rate and power, simple structure and high efficiency and is an all-fibermode-locked ultrashort laser pulse laser with stable environment and novel structure. The all-fiber laser takes rare earth doped fiber as a laser gain medium, works in a totally positive dispersion area, uses a polarizing beam splitter to split light, uses a band-pass type long-period fiber grating filter for wavelength selectivity of a mode-locked laser centre and spectral filtering light pulse compression of mode-locked laser and takes a semiconductor saturable absorber as fiber laser structures. The totally positive dispersion cavity mode-locked all-fiber laser has picosecond and femtosecond light impulse length polarizing laser output and lasers with the wavelengths longer than 1 micrometer and can be used for pumping-detecting ultrafast light physical experiments or the environmental monitoring and the microwave photonics and biophysics detection of a molecular system, double-wavelength pumping-detecting ultrafast light physical experiments, frequency-combining light radiation generation, coherent anti-Stokes Raman scattering microscopy, micromachining, and the like by being amplified by a high-power fiber amplifier.

A fiber laser cavity that includes a laser gain medium for receiving an optical input projection from a laser pump. The mode-locked fiber laser further includes an all fiber based laser cavity including a dispersion management fiber segment for generating a negative (anomalous) to match a positive normal dispersion. The dispersion management fiber segment further coordinates with a polarization-controlling device for generating a polarization maintenance (PM) output laser pulse with a narrow pulse width.

The invention discloses a tapered fiber-based tunable dual-wavelength mode-locked fiber laser, which comprises a (2+1)*1 beam combiner, a thulium-doped fiber, a coupler, a polarization controller, a polarization independent isolator, a tapered fiber and a single-walled carbon nanotube which are sequentially connected end to end, wherein the (2+1)*1 beam combiner is also connected with a pump light source; the coupling ratio of the coupler is 10 to 90; the coupler comprises a 10% output port and a 90% output port in all; the 10% output port is connected to an output fiber; the 90% output port is connected to the polarization controller; the modulation period of the tapered fiber is 6.8-7.2nm; and the taper twist of the tapered fiber is 7.0-7.5microns. Through the tapered fiber with specific modulation period and modulation depth, the problem of laser mode competition is successfully solved by the tapered fiber; and output of tapered fiber-based tunable dual-wavelength mode-locked fiber laser light with a 2micron waveband is achieved.

The invention relates to a tunable erbium-doped fiber ring laser which can output stable wavelength and power, which relates to an optical fiber communication technology. The tunable laser and an isolator of the invention are connected with the ring cavity through an input terminal of a first optical coupler, the 980nm pumping is optically coupled in the erbium-doped fiber gain medium by a WDM coupler; a second optical coupler is an output terminal; through controlling phase-shift phase of phase-shifted grating, filtering function can be realized; through regulating the wavelength of the injected laser of the tunable laser, injection locking can be realized and the laser can be stably outputted. The tunable single-longitudinal erbium-doped fiber ring laser of the invention has the advantages of low cost, simple device and easy operation; the tunable single-longitudinal mode output with output wavelength and wavelength of stable power can be finally obtained.

Fiber lasers for producing Band I wavelengths include a laser cavity having an optical fiber with specific parameters in length and thickness and doping concentration, and having high reflectivities. Examples show the feasibility of producing such fiber lasers.

Fiber lasers for producing Band IV wavelengths include a depolarized laser oscillator, at least one amplifier and a polarizer. Depolarized laser oscillator is an inherently depolarized CW laser, or a depolarized laser diode, which is depolarized by a depolarizer.

Additional fiber lasers in accordance with embodiments of the present invention include a double clad active optical fiber having a pump power entry point for sending pump energy through the active optical fiber in a first direction, and a loop portion at a second end of the fiber for sending pump energy through the active optical fiber in a second direction which is opposite to the first direction.

A system for coupling light into a fiber in accordance with embodiments of the present invention include a first fiber, a second double clad fiber, and a bulk optic component positioned between the first and second fibers. A mode stripper included within the second fiber allows for removal of high power light which is propagated through the outer clad rather than launched into the core of the second fiber.

The invention relates to a full fiber laser, especially relates to a ring cavity full fiber laser with a adjustable wavelength, narrow line width, high signal-to-noise ratio and single-polarization output character, which can be uses as light source, widely applied to fiber communication and fiber sensing technology field. The laser mainly includes: semiconductor laser, wave division duplexer, the outputted laser is emitted to the erbium-doped fiber through the wave division duplexer, then it is transmitted to the fiber isolator, fiber polarization device, and it is connected to one port in the coupler cavity, another port is connected to the fiber isolating device, and connected to the wave division duplexer through another port of the fiber isolator, forms a ring cavity structure; out of the fiber coupler, one port is connected to the Bragg fiber gratings, the other port is connected to the output ports of the laser. The invention can acquire laser output with narrow line width, single-polarization laser, the line width can be less than 1GHz, and namely, the line width at 1550nm waveband is less than 0.008nm.

This invention discloses a initiative full-Q-switched fiber laser. Ring-wide initiative Q-switched fiber laser, including pumped semiconductor lasers, wavelength division multiplexing, gain fiber, optical fiber isolators, optical fiber coupler and output fiber, optical attenuator and optical isolators in optical fiber coupler and set between the variable its driver, variable optical attenuator from electro-optic material, magneto-optical materials, or micro-electro-mechanical systems pose. Active Q-switching linear cavity all-fiber laser, including pumped semiconductor laser, high reflectivity Fiber Bragg Grating, gain fiber, low reflectivity Fiber Bragg grating, in the gain fiber and low reflectivity between Fiber Bragg Grating set up and variable optical attenuator driver source, variable optical attenuator from electro-optic material, magneto-optical materials, or micro-electro-mechanical systems pose. The advantages of the present invention is that the whole initiative Q-switched fiber laser used as a variable optical attenuator Q-switched laser device, the structure is simple and easy to implement.

The invention discloses a graphene-based mid-infrared dual-wavelength co-repetition frequency pulsed fiber laser, which belongs to the field of pulsed fiber lasers. The graphene-based mid-infrared dual-wavelength co-repetition frequency pulsed fiber laser comprises a reflector coated with a graphene thin film; a first diachroscope is arranged at the same horizontal position of the reflector; the first diachroscope is arranged obliquely at an angle of 45 DEG in relative to the horizontal direction; a relatively-parallel second diachroscope is arranged right above the first diachroscope; a dual-wavelength pulse output end is arranged above the second diachroscope; a fourth plano-convex lens is arranged between the first diachroscope and the reflector; the fourth plano-convex lens can focus light beams into the reflector; the first diachroscope is located in a 3mum optic resonator, the second diachroscope is located in a 2mum optic resonator, and thus both the two diachroscopes can play a direction guiding role on 2mum and 3mum light. Thus, the design is delicate, mid-infrared dual-wavelength co-repetition frequency high-power laser pulses can be acquired, and compared with the traditional method, the structure is simple, the size is small, the loss is low, the operation is simple and convenient, and integration is easy.

The invention relates to a high repetition frequency harmonic wave mode locking fiber laser based on external continuous light injection, comprising a laser pumping source, a wavelength division multiplexing device, an optical isolator, a continuous light source, an optical coupler, a saturable absorber and a gain fiber, wherein the laser pumping source is connected to the pumping input terminal of the wavelength division multiplexing device, and the wavelength division multiplexing device is in connection with the optical isolator, and is then connected to the optical coupler together with the continuous light source; the optical coupler comprises a laser signal output terminal and a signal connection output terminal, wherein the signal connection output terminal is successively in connection with the saturable absorber and the gain fiber; the gain fiber is then in connection with the wavelength division multiplexing device; glowing ions are doped in the fiber core of the gain fiber. The high repetition frequency harmonic wave mode locking fiber laser has the characteristics of simple structure and low cost; through the combination between the continuous light source and a passive mode locking fiber laser, high repetition frequency harmonic wave mode locking is realized; in addition, outputted optical pulses possess the advantages of high repetition rate and narrow pulse width.

A fiber laser cavity that includes a fiber laser cavity that includes a laser gain medium for receiving an optical input projection from a laser pump. The fiber laser cavity further includes a positive dispersion fiber segment and a negative dispersion fiber segment for generating a net negative dispersion for balancing a self-phase modulation (SPM) and a dispersion induced pulse broadening-compression in the fiber laser cavity for generating an output laser with a transform-limited pulse shape wherein the laser gain medium further amplifying and compacting a laser pulse. The fiber laser cavity further includes a gain-flattening filter for flattening a gain over a range of wavelengths whereby the laser cavity is enabled to amplify a laser with improved pulse shape over the range of wavelengths.

The invention provides a fiber laser system with narrow-line-width and high-peak power pulse output. The fiber laser system comprises a seed laser source generator capable of generating narrow-line-width seed laser which is of wavelength interval 1-50 nm and outputs multiple wavelengths. The seed laser is amplified through a high-power fiber amplifier and then output through an output fiber. The seed laser source generator comprises at least two narrow-line-width lasers with low-power fiber output, pulse modulation circuits with sequential control, a fiber combiner and a first optical isolator; laser emitted by each narrow-line-width laser is modulated by the corresponding pulse modulation circuit and then passes through the fiber combiner and the first optical isolator sequentially. The multiple low-power narrow-line-width pulse seed lasers generated by the fiber laser system have high power, thus gain of the fiber amplifier is reduced. With the low-power narrow-line-width pulse seed laser sources, power of laser of each wavelength can be reduced during amplification, and nonlinear effects such as stimulated Brillouin scattering and stimulated Raman scattering can be avoided.

Long-period fiber gratings are placed in a predetermined pattern along a double-clad optical fiber having an outer cladding, an inner cladding and a core. The core is doped with an optically active material such as, for example, a rare earth ion or other laser ion. The long-period fiber gratings couple light between a mode of the inner cladding and a mode of the core. As a consequence of increased coupling into the core resulting from the use of long-period fiber gratings, the length of double-clad optical fiber needed to transfer light between the inner cladding and the core is reduced.