122 results about "Regenerative amplifier" patented technology

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 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.

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.

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.

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 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.

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.

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.