12 results about "Regenerative amplification" patented technology

The invention discloses a non-linear frequency conversion regenerative amplification device and a method thereof, and belongs to the technical field of laser non-linear frequency conversion. The device comprises a signal light injection unit, a regeneration amplification cavity unit and a pump light synchronization unit. The regenerative amplification cavity unit comprises an optical resonant cavity structure module, a polarization control module and a nonlinear action module. A time domain switch is formed through the polarization control module under the driving of the time schedule controller, and the preset number of times of circulation of signal light in the cavity is accurately controlled. And meanwhile, the pump light synchronization unit generates pump pulse string laser which is synchronous with the circulation process and has sub-pulse power increasing in sequence, so that the signal light and one corresponding pump sub-pulse are subjected to optical parametric amplification in the nonlinear crystal in each circulation. The space complexity of multi-stage amplification is converted into time domain controllability, high-efficiency and high-gain nonlinear frequency conversion is realized by using a single-stage compact structure, and the integration level and the stability of the system are remarkably improved.

The invention discloses a coherent optical frequency signal regeneration amplification system based on optical fiber transmission. The coherent optical frequency signal regeneration amplification system comprises a local narrow linewidth laser which outputs narrow linewidth laser; the first optical fiber coupler couples the narrow linewidth laser to the first acoustic optical modulator and the second acoustic optical modulator respectively; the output of the first acousto-optic modulator and superior transmission light are jointly coupled into a photoelectric detector by a second optical fiber coupler to generate a beat frequency signal; the signal processing module samples the beat frequency signal after conditioning the beat frequency signal, performs phase discrimination on the sampled signal and the digital reference signal to generate an error signal, and generates a first feedback signal and a second feedback signal according to the error signal to be respectively used by the local narrow linewidth laser and the first acousto-optic modulator; performing real-time cycle slip detection on the error signal and repairing a phase abnormal point to generate a third feedback signal to be used by a second acousto-optic modulator; and the second acousto-optic modulator outputs amplified regenerated laser. According to the invention, high-precision optical frequency signal transmission can be realized in a complex and changeable optical fiber environment with large noise.

The invention discloses a cavity parameter optimization method for a bicrystal regeneration amplification structure. The bicrystal regeneration amplification structure to be optimized comprises an optical resonant cavity, two gain crystals arranged in the optical resonant cavity, a pumping source, a pumping light path system matched with the gain crystals, an optical switch arranged in the optical resonant cavity and a reflector used for forming the resonant cavity, the method comprises the following steps: determining the relative position and spacing of two gain crystals in an optical resonant cavity; calculating and designing the physical cavity length of the optical resonant cavity according to the electro-optical switch response time of the optical switch; the curvature radius of the reflector is calculated and selected according to the thermal lens effect possibly generated by the gain crystals under high-power pumping, and the pumping power distribution of the pumping light path system to the two gain crystals is optimized according to the output power of the pumping source and the thermal performance of the two gain crystals. And pumping energy and heat load generated by the pumping energy are dispersed on the two gain crystals.

The invention discloses a laser processing system based on a phase synchronization signal and a laser, and relates to the technical field of laser time sequence processing. The system comprises a seed source, a photoelectric sensor, an amplifier, a counter, a trigger, a digital phase-locked loop and a frequency divider. The photoelectric sensor is used for converting the seed light into a laser signal and sending the laser signal to the amplifier. The amplifier sends the amplified signals to the counter and the trigger respectively. And when the count value of the counter is equal to the pre-stored cycle value, zero setting is carried out and a trigger signal is sent to the trigger. The trigger is used for outputting a time sequence pulse to the digital phase-locked loop. And the digital phase-locked loop is used for synchronizing the phase of the system clock with the time sequence pulse and outputting a system clock signal to the frequency divider. The frequency divider is used for carrying out frequency division based on the system clock signal so as to carry out menu selection and / or regeneration and / or amplification. Therefore, the laser processing system can realize the menu selection, regeneration and amplification of the laser based on the time sequence of the seed light, and the time jitter is small.

The application discloses a device and a method for nonlinear frequency conversion regenerative amplification, and belongs to the technical field of laser nonlinear frequency conversion. The device comprises a signal light injection unit, a regenerative amplification cavity unit and a pump light synchronization unit. The regenerative amplification cavity unit comprises an optical resonant cavity structure module, a polarization control module and a nonlinear action module. The polarization control module is driven by a time sequence controller to form a time domain switch, and the signal light is accurately controlled to circulate in the cavity for a preset number of times. At the same time, the pump light synchronization unit generates a pump pulse train laser which is synchronized with the circulation process and whose sub-pulse power increases in sequence, so that the signal light occurs optical parametric amplification with a corresponding pump sub-pulse in a nonlinear crystal in each circulation. The application converts the spatial complexity of multi-stage amplification into time domain controllability, realizes high-efficiency and high-gain nonlinear frequency conversion by using a single-stage compact structure, and significantly improves the system integration and stability.

The invention discloses a concave surface total reflection position optimization method for a bicrystal regeneration amplification structure. The to-be-optimized bicrystal regeneration amplification structure comprises an optical resonant cavity, two gain crystals arranged in series, two concave total reflective mirrors and a Pockels cell. The method comprises the following steps: determining the positions of two gain crystals in a bicrystal regeneration amplification structure in an optical resonant cavity, and setting the initial positions of two concave total reflective mirrors according to the physical cavity length of the optical resonant cavity; establishing a thermal lens effect model of the gain crystal, obtaining thermal lens focal lengths of the gain crystal under different pumping powers, and carrying out substitution optimization on initial positions of the two concave total reflective mirrors; and verifying the optimized position of the concave total reflective mirror, detecting the stability of the optical resonant cavity and the beam quality of the output laser in a set pumping power range, and if the stability and the beam quality meet preset requirements, determining the optimized position of the concave total reflective mirror as a final position.

The application discloses a CALGO crystal regenerative cavity and an assembling and adjusting method thereof, and relates to the technical field of lasers.The regenerative cavity comprises a seed source, an isolator, a polarization beam splitter, a polarization control assembly, a first cavity mirror, a self-imaging assembly, a gain medium, a double dichroic mirror, a second cavity mirror, a pump source, an equivalent short cavity mirror, a low-power consumption mirror and a power meter.The equivalent short cavity is established through the equivalent short cavity mirror and the second cavity mirror, the cavity length is prolonged through the self-imaging assembly, and the assembling and adjusting are dynamically fed back through the low-power consumption mirror and the power meter, so that the femtosecond laser regenerative amplification output with the advantages of easy assembling and adjusting, high stability, wide spectrum and high power is realized.

The invention discloses a temperature-insensitive silicon-based hybrid integrated active optical frequency laser regeneration relay chip, which is suitable for a photon integrated optical frequency cascade transmission system. The chip can carry out on-chip regeneration amplification on a received previous-stage optical signal, and outputs an optical frequency signal with a stable phase to a next stage. According to the invention, the low-loss passive silicon-based waveguide is extremely low, and strict length matching is carried out on the out-of-band waveguide path in the chip, so that out-of-band phase noise caused by temperature change can be effectively inhibited, and the environmental adaptability of the chip is improved. Meanwhile, by means of advanced processes such as micro transfer printing, heterogeneous hybrid integration is carried out on a high-efficiency on-chip frequency shifter and a polarization controller which are realized on the basis of high-electro-optical coefficient materials such as thin-film lithium niobate, so that the on-chip optical frequency laser regeneration relay chip with complete functions is constructed. The chip has the advantages of being compact in structure, low in power consumption, high in environmental adaptability and the like, and is suitable for construction of a next-generation miniaturized optical frequency transfer network.

The invention discloses a CALGO crystal regeneration cavity and an adjusting method thereof, and relates to the technical field of lasers. The regeneration cavity comprises a seed source, an isolator, a polarizing beam splitter, a polarization control assembly, a first cavity mirror, a self-imaging assembly, a gain medium, a dichroic mirror, a second cavity mirror, a pumping source, an equivalent short-cavity reflector, a low-power-consumption reflector and a power meter. An equivalent short cavity is established through the equivalent short cavity reflecting mirror and the second cavity mirror, the cavity length is prolonged through the self-imaging assembly, and the femtosecond laser regeneration amplification output which is easy to install and adjust, high in stability, wide in spectrum and high in power is achieved through dynamic feedback installation and adjustment of the low-power-consumption reflecting mirror and the power meter.

The invention relates to the technical field of ultrafast laser, and discloses a bicrystal regeneration amplification system. Comprising an optical resonant cavity, two Yb: KGW crystals are adopted as gain media in the optical resonant cavity, seed pulses sequentially penetrate through the two Yb: KGW crystals in each circulation when oscillating back and forth in the optical resonant cavity, energy is extracted from gains jointly provided by the two Yb: KGW crystals, and injected pumping energy and generated thermal loads are dispersed on the two Yb: KGW crystals; by adjusting the physical cavity length of the optical resonant cavity, the time for the optical pulse to go back and forth for a circle in the cavity is longer than the starting time required by the Pockels cell in the cavity from pressurization to establishment of stable quarter-wave voltage before the seed pulse returns to the Pockels cell for the first time; two concave reflectors are arranged in the optical resonant cavity, and light beam distortion caused by the thermal lens effect of the Yb: KGW crystal is compensated under high-power pumping.

The invention discloses an oscillation mode optical parameter chirped pulse amplification laser and method. The core of the system is to construct a composite resonant cavity, and the cavity partially shares a key optical element, so that the resonant cavity of the slab regenerative amplifier and the resonant cavity of the synchronous pump optical parametric oscillator (OPO) are physically coupled. The specific scheme is as follows: a broadened picosecond chirp seed pulse is injected into a regenerative amplifier for energy amplification; the method is characterized in that the amplified high-energy chirped pulse is directly used as pump light, and the pump light is embedded in a common nonlinear crystal in the composite cavity to excite optical parametric oscillation. Two processes of'chirp pulse regenerative amplification 'and'synchronous pump optical parametric oscillation' are synchronously generated in a composite resonant cavity which is overlapped in time and space, so that energy is circularly extracted from chirp pump light in multiple oscillation processes of OPO signal light, and a unique'oscillation mode OPCPA 'is formed.

This invention relates to a mid-infrared femtosecond laser hair regrowth device and treatment instrument. The mid-infrared femtosecond laser hair regrowth device includes a regenerative amplification module for generating near-infrared femtosecond laser; a parametric conversion module for receiving the near-infrared femtosecond laser, converting it into mid-infrared laser, and outputting it; an anti-resonant hollow fiber, the input end of which is coupled to receive the mid-infrared femtosecond laser output by the parametric conversion module for transmitting the mid-infrared laser; and a treatment handpiece including a first collimating lens, a scanning galvanometer, and a liquid lens. The first collimating lens is located on the output optical path of the anti-resonant hollow fiber for collimating the mid-infrared laser, the scanning galvanometer is used to control the deflection of the collimated beam, and the liquid lens is used to receive the deflected beam and adjust its focusing state. The mid-infrared femtosecond laser hair regrowth device and treatment instrument can output mid-infrared femtosecond laser with precise wavelength, achieve low-loss flexible laser transmission, and can be adjusted in real time on the working surface.