122 results about "Regenerative amplifier" patented technology

The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.

A super-regenerative receiver uses controlled Q-quenching and may limit the resonant tank circuit amplitude by loading the tank circuit as soon as regenerative oscillation is detected. An amplitude detector is coupled to the regenerative amplifier and controls a Q loading circuit coupled to the tank circuit of the regenerative amplifier. The amplitude detector turns on the Q loading circuit which then stops the regenerative amplifier from oscillating, and the Q-loading remains on for a brief time to insure that the regenerative amplifier has stopped oscillating. After the brief time, the Q loading circuit is turned off and the regenerative amplifier goes into oscillation again. This cycle repeats controllably over and over, resulting in a lower self-induced noise floor and improved received signal sensitivity. The super-regenerative receiver may be used in the very low frequency (VLF), low frequency (LF), medium frequency (MF), high frequency (HF), very high frequency (VHF) and super high frequency (SHF) ranges to receive continuous wave (CW), amplitude modulated (AM) and frequency modulated (FM) radio signals.

The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.

The present invention discloses a laser amplifier with high gain and low thermally induced optical aberrations on the amplified laser beam. The amplifier designs allow simple multipass configurations to optimally extract the gain and reduce thermally induced index of refraction aberrations, making it possible to obtain an amplified laser beam of high quality combined with very high overall gains comparable to those achievable with expensive regenerative amplifiers. The amplifier includes a thin active laser solid to create the population inversion and associated heat generation within the thin laser active solid possible for the desired gain value. The system includes a cooling device in thermal contact with the thin active laser solid to provide good heat transport and high reflectivity coatings at the wavelengths of the pump and laser wavelengths. The pump light sources are laser diodes tuned to the maximum absorption of the laser active material. The amplifier also includes an optical system to transport the pump light to the laser active solid in such a way as to further confine the absorption of light along the two orthogonal directions in the plane of the laser active solid in order to get high population inversion and consequently high gains possible.

Provided is a high-repetition-rate femtosecond regenerative amplification system. The regenerative amplification system includes: a laser oscillator emitting pulses; a stretcher stretching the pulses with negative dispersion; a regenerative amplifier amplifying the pulses, the regenerative amplifier comprising an acousto-optic modulator for pulse switching, a pulsed pump laser for pumping a gain medium, a resonator for reciprocating the pulses between a plurality of mirrors, and at least one chirped mirror for providing negative dispersion; and a glass compressor compressing the pulses. Accordingly, the 100 kHz-class high-repetition-rate femtosecond regenerative amplification system can produce an output energy of tens of μJ, higher than a few μJ provided by a conventional system.

The invention belongs to the technical field of a laser, in particular relates to a single-cavity dual-electrode discharging cavity and a quasimolecule laser adopting the same. The single-cavity dual-electrode discharging cavity comprises a cavity body and two sets of main discharging electrodes, wherein the cavity body comprises a left chamber and a right chamber to form a symmetrical dual-chamber structural shape, the cross section of each chamber is shaped like a pear with small top and large bottom, the left chamber and the right chamber are intersected on a symmetric surface of the entire discharging cavity and communicated with each other, and the two sets of main discharging electrodes are respectively arranged on the upper sides of the left and the right chambers. A dual-cavity function of a master oscillator power amplifier (MOPA), master oscillator power oscillator (MOPO) and master oscillator power regenerative amplifier (MOPRA) structure can be realized, and not only is the complexity of the system reduced, but also the discharging synchronism of the discharging cavity is guaranteed.

A self-contained module injects seeds into a slave laser for applications such as single mode or multimode injection seeding, master oscillator power amplifiers, regenerative amplifiers, optical parametric oscillators, Raman lasers, and LIDAR systems. The injection source provides a continuous wavelength sweeping for master-slave resonance to replace conventional cavity length control of the slave laser and phase locking schemes. The inventive module can be operated remotely as a separate unit or be packaged as a subsystem in the injection seeding system. The salve can be used as it is. Modifications of the slave laser and / or additional efforts are not needed.

An optimized Yb: doped fiber mode-locked oscillator and fiber amplifier system for seeding Nd: or Yb: doped regenerative amplifiers. The pulses are generated in the Yb: or Nd: doped fiber mode-locked oscillator, and may undergo spectral narrowing or broadening, wavelength converting, temporal pulse compression or stretching, pulse attenuation and / or lowering the repetition rate of the pulse train. The conditioned pulses are subsequently coupled into an Yb: or Nd: fiber amplifier. The amplified pulses are stretched before amplification in the regenerative amplifier that is based on an Nd: or Yb: doped solid-state laser material, and then recompressed for output.

The invention is a table-type all-solidified high-repeated frequency fly-second laser device, comprising fly-second pulse oscillator, pulse widening device, regenerative amplifier and pulse compressor, and its character: the pulse widening device is composed of grating, convex lens and concave reflector; the regenerative amplifier is composed of polarizing plate, Pockels cell, highly reflecting concave mirror, Ti-sapphire stick and reflector group; the pumping source of the regenerative amplifier is a Q-switch plane waveguide laser; the pulse width compressor is composed of reflector, two parallel-placed gratings and all reflector. Its output power can be up to 20W, higher 31 times than that of preceding technique, able to be applied to generate super ultraviolet or X rays, and has an extremely wide application prospect in photoetching, optical communication and micro-fabricating technique.

A solid condition kHz pico-second laser burst regenerative amplifier belongs to a omni-solid condition regenerative amplifier, which is characterized in that: the two lumen mirror of the magnifying resonant cavity are consisted of an average lumen formed by a first omni-opposite lumen mirror (7) and a second omni-opposite lumen mirror (14), the inner of the resonant cavity is arranged with a minus lens (12) and a second lambada / 4wave plate (13) arranged between the laser crystal (9) which is a Nd:YAG bar and the second omni-opposite lumen mirror. The fast axis of the wave plate is parallel with the light vector of the inputting linearly-polarized light. The minus lens is arranged between the laser crystal and the second lambada / 4 wave plate or the second lambada / 4 wave plate and the second omni-opposite lumen mirror. The pump source is a continuously worked semiconductor laser diode array (10) and the working frequency is 1kHz. The laser crystal can also be a Nd:YLF bar, here the second lambada / 4 wave plate is needless. The invention reduces the volume and the costs of the system, effectively solves the problem of Nd:YAD regenerative amplifier domino offect, and effectively ensures the magnification and the beam quality.

The present invention relates to a parallel femtosecond laser two-photon photopolymerization micron nano processing method and its equipment. Said equipment includes the following several portions: pump laser, femtosecond laser, resonant cavity, amplifier, reflecting mirror, attenuator, optical gate, fibre-optic coupler, microlens array, three-dimensional scanning platform and its driven and computer control system. Said invention also provides the concrete steps of its processing method.

This invention discloses a design method for small femtosecond laser impulse stretcher used in regenerative amplifier high-dispersion material compensation, which belongs to the femtosecond impulse amplify technique. This method adopts concave spherical lens, convex spherical lens, grating and plane lens to design structure according to the phase Phi and grating position S1 of the stretcher. This method is characterized by the following: If the curvature radius of spherical lens is R, the distance between the grating and the concave spherical lens varies between zero to R; the convex spherical lens overlapped with the grating; if the stretching spectrum of the incidence light is larger than the lens width of the concave spherical lens, then it needs to reduce with equal proportion the curvature radium of the concave spherical lens and convex spherical lens and reduces the spectrum stretching width and keeps the original stretching degree.

The invention relates to a wideband optical parametric chirped pulse amplification (OPCPA) laser system with a stable carrier envelope phase. The laser system comprises a femtosecond laser device with an output wavelength of 1550nm, a spectroscope, a signal light generator, a stretcher, an angular disperser, a photonic crystal fiber frequency converter, a regenerative amplifier, multi-level Nd: yttrium aluminum garnet (YAG) amplifier, a reflection mirror, an optical parametric amplifier and a compressor. The wideband optical parametric chirped pulse amplification laser system is characterized in that a wideband signal light generated by difference frequency action has a high circular error probable (CEP) stability and a tunable characteristic of the wideband; the signal light and pump light are from the same laser device; under a condition of ignoring the environment jitter influence, the high-precision time synchronization with 10-femtosecond between a signal light pulse and a pump light pulse can be ensured, and the invention has a good frequency stabilization effect; OPCPA of the wideband is realized by means of the angular disperser, and an intermediate infrared tunable laser source is obtained.

The invention provides a self-adapting burst-mode signal receiving and regenerating amplifier, relating to the technical field of digital communication. The prior art has the defects of low receiving sensitivity and no self-adapting capability. The amplifier of the invention comprises an AC coupling circuit, a high-pass filtering circuit and a positive feedback amplifying circuit. By combining a series of high and low pass filters and a multistage amplifier, the bit-by-bit recovery of burst-mode signals is realized, and the receiving sensitivity is improved. The whole processes of input, amplification, regeneration and output of signals are automatically finished. The invention has perfect self-adapting functions.

The invention discloses a pulse stability control device and a method of a laser regeneration amplifier. The device comprises a polarization beam splitter prism, an electro-optical modulation Q switch, a 1 / 4 wave plate, a first plane mirror, a second reflector, a laser amplification and gain control module and a third reflector that jointly form the laser regeneration amplifier, wherein the firstplane mirror, the second reflector and the third reflecting mirror form a resonant cavity of the laser regeneration amplifier; the laser amplification and gain control module comprises a fourth reflector, a laser crystal, an LD target strip and a fifth reflector; and the fourth reflector, the laser crystal and the fifth reflector form a gain adjustment cavity. The efficient amplification of a multi-pulsed laser can be achieved; the pulse stability of output of the multi-pulsed laser is controlled by adjusting a gain in an amplification medium; and the high stability amplification of the multi-pulsed laser with different repetition frequencies is achieved.

This invention provides a solution for operating a regenerative amplifier using a single electro-optical device, such as a Pockels cell. An efficient cavity geometry of a regenerative amplifier is provided for enabling pulse selection, coupling and releasing to an output by operating a single Pockels cell unit placed essentially in the middle of the optical cavity, between two polarizers, whereas a first polarizer is used for release of an amplified pulse and a second polarizer is used for injection of seed pulses and release of at least one of waste amplified pulses and seed pulses. One side of the cavity, with respect to the location of said Pockels cell, includes an empty space, whereas the other side is provided with a gain medium, which is pumped by a pump source. The regenerative amplifier of such optical design is both efficient and cost effective. The single electro-optical unit works both as the control unit for operating the regenerative amplifier and as an output pulse picker unit.

A device generating supershort-superhigh laser pulse line of highly repeated frequency consists of self mode locking iiwaarite laser oscillator of mode locking pulse line, Faraday light isolator, aberration free laser pulse stretcher, regeneration amplifier of iiwaaeite, quantity selector of laser pulse, multistroke iiwaarite laser amplifier chain, gating pair pulse compressor in pumping laser and vacuum chamber. It is featured as exerting the first and the second DC high voltage signals on electrodes of Pochels box on amplifier, using a synchronous signal to control the first and the second DC high voltage source to work separately.

A self-contained module injects seeds into a slave laser for applications such as single mode or multimode injection seeding, master oscillator power amplifiers, regenerative amplifiers, optical parametric oscillators, Raman lasers, and LIDAR systems. The injection source provides a continuous wavelength sweeping for master-slave resonance to replace conventional cavity length control of the slave laser and phase locking schemes. The inventive module can be operated remotely as a separate unit or be packaged as a subsystem in the injection seeding system. The salve can be used as it is. Modifications of the slave laser and / or additional efforts are not needed.

There is provided an optical regenerative amplifier for regenerative amplification of a binary phase shift-keying (BPSK) sequence of optical signals having a predetermined time slot between any adjacent signals. The optical regenerative amplifier comprises a first delay interferometer, wherein an input sequence of BPSK signals is split between two arms of an interferometer, a relative delay by the time slot between the adjacent signals is introduced in one of the arms of the interferometer to produce two mutually anti-symmetric trains of amplitude shift-keying (ASK) signals; a discriminative limiting amplifier to amplify the said two trains of anti-symmetric ASK signals, wherein the amplification for the spaces is smaller compared to the amplification for the marks and the amplification for the marks is limiting; and a second delay interferometer, wherein the said two trains of anti-symmetric ASK signals are recombined, delayed, and interfered to reproduce a regeneratively amplified BPSK sequence of signals and to separate noise from the signals.

The invention relates to a method and equipment for femtosecond laser somatic cell nuclear transplantation, in particular to a micro-nano control method which adopts a light knife effect induced by femtosecond laser two-photon and optical tweezers gradient force induced by high photon density. A pump laser is started-up; the laser produced by the pump laser is introduced into a resonator of a femtosecond laser; when the oscillation is done, the energy of the ultrashort femtosecond laser pulse is amplified through a regenerative amplifier, and the pulse number and the repeated frequency of laser output are chosen. The emitted femtosecond laser is divided into two beams of light, one of which used for realizing the femtosecond optical tweezers, and the other of which is used for realizing the function of the femtosecond optical tweezers through a half-permeable and semi-reflecting mirror, and then the two beams of light are coupled with an optical path through another half-permeable andsemi-reflecting mirror to realize the amplification of a spot light area; then the light beams is focused on a target cell, and the harmless transplantation operation of the somatic cell nuclear is done. A switch for controlling a light valve is arranged in a software control system, which can not only realize the operation of the laser spot on the target cell, but also adjust the scanning speed and change the exposure time to meet different requirements and enhance the success rate of the somatic cell nuclear transplantation.

The invention discloses a linear-cavity optical fiber regenerative amplifier, and relates to a laser. Doped fibers are adopted to replace a working substance of the traditional linear-cavity regenerative amplifier, such as laser crystals or glass; and a control circuit can regeneratively amplify signal-pulses with different energies and different wavelengths to acquire the maximum output power automatically, and the manual control of a second pockels cell is not needed any more. In the linear-cavity optical fiber regenerative amplifier, signal light passes through the working substance for multiple times, so the pump light is fully utilized and the pumping efficiency is improved. The linear-cavity optical fiber regenerative amplifier is suitable for obtaining high power or energy polarization pulse light output by passing light pulses through various doped optical fibers.

The invention adopts the femtosecond laser two-photon induced photo knife effect and the high photon density induced optical tweezers gradient force function for carrying out a micro-nano manipulation, which is applicable to the study of the injury, regeneration and repair of various biological cells. The invention consists of a laser generation system, an external optical path system, a high precision imaging system and a software control system. The laser generation system includes two parallel branches, one branch consists of a lock mould knob and a femtosecond laser sequentially, and the other branch consists of a digital delay / pulse signal generator and a regeneration amplifier sequentially. The external optical path system consists of a dual-branch optical path, a semi-transparent semi-reflection mirror, an optical gate and a beam expander sequentially. The dual-branch optical path includes two parts: one part consists of a movable convex lens, a fixed convex lens, a rotatable total reflection mirror and an attenuation mirror sequentially, and the other part is an attenuation mirror. The device can realize the whole process of nano-injury and regeneration study of the nerve cells and can adopt the femtosecond optical tweezers to realize the choice of the super-sophisticated target position during an axon regeneration process.

The present invention discloses a laser amplifier with high gain and low thermally induced optical aberrations on the amplified laser beam. The amplifier designs allow simple multipass configurations to optimally extract the gain and reduce thermally induced index of refraction aberrations, making it possible to obtain an amplified laser beam of high quality combined with very high overall gains comparable to those achievable with expensive regenerative amplifiers. The amplifier includes a thin active laser solid to create the population inversion and associated heat generation within the thin laser active solid possible for the desired gain value. The system includes a cooling device in thermal contact with the thin active laser solid to provide good heat transport and high reflectivity coatings at the wavelengths of the pump and laser wavelengths. The pump light sources are laser diodes tuned to the maximum absorption of the laser active material. The amplifier also includes an optical system to transport the pump light to the laser active solid in such a way as to further confine the absorption of light along the two orthogonal directions in the plane of the laser active solid in order to get high population inversion and consequently high gains possible.

A radio frequency communication system utilizing a radiating transmission line for communicating data signals is disclosed. The data signals convey digital data to remotely located data devices, including computers, equipment control systems and digital video cameras. The data signals have a wide bandwidth of about 0.5 MHz to 32 MHz. In this way, the communication system creates a local area network by means of the radiating communication line. The communication system is intended to be used in environments where radio waves do not propagate well, such as in underground environments, and in particular mines. The communication system comprises at least one amplifier connected to the radiating transmission line for periodically amplifying the data signals by demodulating the data signals to recover the data contained therein and then modulating the recovered data into a regenerated radio frequency at a power level permitting transmission and radiation of the regenerated radio frequency data signal. The regeneration amplifiers comprise a processor for temporarily storing and performing error detection and correction functions on the recovered data. The regeneration amplifiers also comprise a device for tracking the data devices within the coverage area of the regeneration amplifier. Information regarding the data devices within the coverage area of each regeneration amplifier is sent to a system server of the communication system and the system server utilizes this information to account for delays caused by the regeneration amplifier. The communication system may support cable modem protocols such as DOCSIS.

A remote all-optical synchronous optical parameter chirped pulse amplification laser system comprises a 1550nm femtosecond fiber laser, a fiber coupler, a transmission fiber and a fiber connector, a fiber frequency converter, a regenerative amplifier, a frequency-doubling crystal, a fiber stretcher, a optical parameter amplifier and a compressor. The invention is characterized in that signal light and pump light source come from the same fiber laser, leading to the great stability, and the fiber transmission in the system is used for replacing the transmission in the air, realizing the control on the remote laser transmission and remote optical parameter chirped pulse amplification, ensuring the synchronization of the high precisions of signal light pulses and pump light pulses of sub-10 femtosecond magnitude and achieving the high-precision control on luminous beam structure. The invention has the advantages of stable system, simple structure, great flexibility, and easy application and integration with a remote OPCPA amplification system.

A regenerative amplifier system that is optimized for low-gain gain media is provided. The system is configured to include a minimum number of intra-cavity elements while still eliminating the leakage of the seed pulses from the output beam. In addition, the contrast ratio of the amplified pulses is increased even considering the long build-up time that is required in low-gain regenerative amplifiers. This is accomplished using a single Pockels cell between the oscillator and amplifier to select a single seed pulse for the cavity, instead of using a Faraday isolator. This directs the unwanted seed pulses in a separate direction from the output pulse. When the amplified pulse exits the cavity, it is directed in a direction away from the oscillator by the same Pockels cell. Only one additional Pockels cell and one polarizer are required inside the regenerative amplifier cavity.

The invention provides a temperature-and-wavelength-insensitive optical parametric chirped-pulse amplifier, which is formed by a pump light path, a signal light path and an amplifier. The pump light path comprises a neodymium-doped yttrium vanadate regenerative amplifier, a neodymium-doped yttrium aluminium garnet amplifier, a first image transfer system and a frequency doubling crystal. The signal light path comprises a titanium-sapphire regenerative amplifier, a pulse stretcher and a pulse compressor. The amplifier is a nonlinear crystal amplifier. The temperature-and-wavelength-insensitive optical parametric chirped-pulse amplifier is characterized in that a chirp signal light beam and a pump light beam are input to the nonlinear crystal amplifier at a non-colinear angle larger than 5 DEG C; and through optimization of groove number of a first grating, the signal light beam is modified by angular dispersion. The temperature-and-wavelength-insensitive optical parametric chirped-pulse amplifier has the advantages of being insensitive to both temperature and wavelength, and meanwhile, paves the way for synchronously improving the peak power and mean power of an ultra-short ultra-intense laser system.

Provided is a high-repetition-rate femtosecond regenerative amplification system. The regenerative amplification system includes: a laser oscillator emitting pulses; a stretcher stretching the pulses with negative dispersion; a regenerative amplifier amplifying the pulses, the regenerative amplifier comprising an acousto-optic modulator for pulse switching, a pulsed pump laser for pumping a gain medium, a resonator for reciprocating the pulses between a plurality of mirrors, and at least one chirped mirror for providing negative dispersion; and a glass compressor compressing the pulses. Accordingly, the 100 kHz-class high-repetition-rate femtosecond regenerative amplification system can produce an output energy of tens of μJ, higher than a few μJ provided by a conventional system.

This invention relates to a high-repetition rate Ti precious stone chirped pulse regenerative amplifier without spreader in which a green light pump source, a rear concave mirror, a focusing lens, Tiprecious stone crystal and front concave lens are set along a horizontal shaft direction on the mounting plate, an angle folding plane reflector, low end face plane reflector, thin film polaroid, Puckle box, along the second horizontal optical axis, a light beam lead reflector, light conductive reflector, separator, beam splitter, half wave palte are set along the third horizontal optical axis and upper end face plane reflector, dispersion prism, accumulation prism, aligned dispersion prism, output prism light beam lead reflector, light beam converting reflector, photoelectric converter.