10 results about "Pump wave" patented technology

Techniques disclosed herein relate to photon sources with high spectral purity and high brightness. In one embodiment, a photon-pair source includes a pump waveguide, a first resonator coupled to the pump waveguide to couple pump photons from the pump waveguide into the first resonator, a second resonator coupled to the first resonator, and an output waveguide coupled to the second resonator. The second resonator is configured to convert the pump photons into photon pairs. The second resonator and the first resonator are configured to cause a coupling-induced resonance splitting in the second resonator or the first resonator. The second resonator and the output waveguide are configured to couple the photon pairs from the second resonator into the output waveguide. In some embodiments, the photo-pair source includes one or more tuners for tuning at least one of the first resonator or the second resonator.

The embodiment of the invention provides a Raman amplifier gain adjustment method which comprises the following steps: adjusting DRA-P pumping configuration according to a first preset adjustment target, and determining a third preset adjustment target of a preset virtual intermediate point position according to amplifier performance parameters of a receiving end and a second preset adjustment target of a receiving end OSNR, and adjusting the transmitting terminal configuration of the transmitting terminal according to a third preset adjustment target, detecting the actual OSNR of the receiving terminal, and when the actual OSNR does not meet a second preset adjustment target, circularly and finely tuning the DRA-P pumping configuration and / or the transmitting terminal configuration until the actual OSNR meets the second preset adjustment target. According to the embodiment of the invention, segmented decoupling is carried out on the C + L system, and the gain of the amplifier is adjusted and optimized according to the sequence of the receiving end, the transmitting end and the whole, so that the problem that in the prior art, the stimulated Raman scattering effect exists between the pumping wavelengths of the Raman amplifier in the C + L system and between the service light of the C wave band and the service light of the L wave band can be solved; and the overall optical signal-to-noise ratio performance of the C + L system is influenced.

A structural defect detection method and system based on mixed-frequency ultrasonic delayed excitation. Four piezoelectric ceramic sensors are arranged in a rectangular pattern on a surface of a composite material layer. Mixed-frequency sound waves received by the two piezoelectric ceramic sensors undergo bandpass filtering, EMD decomposition and reconstruction, and frequency spectrum-energy spectrum analysis in sequence, then a modulation sideband parameter is extracted from a time-frequency spectrum, and a defect identification parameter is calculated on the basis of the modulation sideband parameter; if the defect identification parameter is greater than zero, a defect is present within a modulation aliasing region at excitation delay time; and if the defect identification parameter is less than zero, no defect is present within the modulation aliasing region at the excitation delay time. On the basis of a mixed-frequency excitation mode of delayed excitation of a low-frequency pump wave and a high-frequency detection wave, mixed-frequency incident waves do not need to be on the same axis, a sound wave aliasing region can be indirectly adjusted, and thus large-scale comprehensive scanning of the structure is achieved.

The application discloses a pump wave-locked device of a fiber laser and belongs to the field of fiber lasers. The pump wave-locked device comprises a wave-locked control system and a pump drift detection module, wherein the pump drift detection module comprises at least a pair of cladding pumping light detection modules; the wave-locked control system controls the refrigeration effect of a pump cooling platform on a pump system according to the signal strength of a first photosensitive detector and a second photosensitive detector in the pair of cladding pumping light detection modules, so as to control the output wavelength of the pump system in real time.

Disclosed is a method for generating a broadband microcomb, that includes generating a comb signal by a pump laser, at a pump wavelength corresponding to a resonance of a micro-resonator, wherein the micro-resonator operates with two modes with a mode separation of a predefined range, heating 5 the micro-resonator using a heater, and deterministically generating broadband microcombs including octave spanning solitons by the micro-resonator by bi- directional tuning of the heater voltage, wherein the bi-directional tuning of the heater voltage tunes the resonance wavelengths of the two modes, and alters the wavelength separation of two modes. 10

The application provides an analysis method for the influence of cavitation and temperature on the sealing performance of a nuclear main pump. The method comprises selection of a cavitation model, judgment of fluid flow state, setting of boundary conditions and analysis of the influence on sealing performance. Three different calculation models are selected, and sealing performance parameters under changes in film thickness and rotational speed are calculated. Comparison of the calculation results of the three models shows that: (1) when the film thickness is small, the cavitation effect has a greater influence on the opening force, and the opening force is obviously promoted, and the viscosity-temperature effect reduces the opening force. When the film thickness is large, the cavitation effect is weakened or even disappears, and the influence of the viscosity-temperature effect on the opening force and leakage exceeds the cavitation effect. (2) When the rotational speed is low, the cavitation area is small, and the change in the opening force is not obvious, but the viscosity-temperature effect still has a very obvious promoting effect on the leakage. When the rotational speed is high, the influence of the cavitation effect on the opening force is greater than that of the viscosity-temperature effect, and the cavitation effect promotes the increase of the opening force, and the influence of the viscosity-temperature effect on the opening force is small.

A device for compensating temporal walk-off of a nonlinear quantum optical element according to the technical idea of the present disclosure includes an optical waveguide for propagating input light along a specific path. The optical waveguide includes: a nonlinear optical source section that transmits input light including a plurality of modes; a polarization separation section that separates the plurality of modes; a taper section that converts the separated modes; and a curve section that changes the direction of propagation of the input light. The plurality of modes include a pump wave, a signal wave, and an idler wave. The group velocities of the pump wave and the idler wave are identical, and the group velocity of the signal wave differs from that of the pump wave or the idler wave.

The present invention relates to a non-linear resonant-structure optical transistor operating at a single frequency, comprising a non-linear medium that amplifies a signal wave through inverse second-harmonic generation or inverse third-harmonic generation interaction with a second-harmonic wave or a third-harmonic wave, and being in an off state in which no output wave is present at a collector when only a pump wave is input into an emitter of the optical transistor, and being in an on state in which a signal wave is amplified and output to the collector when the pump wave is input into the emitter and the signal wave is input into a base, wherein an input wave at the base controls an input wave at the emitter so as to control the on-off state and intensity of the output wave at the collector, thereby simultaneously implementing amplification and switching of the optical signal. In this manner, the present invention provides an optical transistor operating with a single-frequency light wave, and an optical system comprising same.

The invention provides an indium tin oxide thin film for enhancing terahertz emission and a preparation method of the indium tin oxide thin film, and belongs to the technical field of nonlinear optics and terahertz. The method comprises the following steps: depositing an indium tin oxide (ITO) film on a substrate by adopting a magnetron sputtering process; and the thin film is placed in a vacuum environment to be subjected to rapid thermal annealing treatment. The core of the method is that the annealing time and the annealing temperature are accurately controlled, and the thin film is regulated and controlled to be in a middle semitransparent state which is converted from opaque to full-transparent. Experiments show that the ITO thin film in the semitransparent state maintains high nonlinear absorptivity in a near-infrared pumping wave band while ensuring certain crystallization quality, so that the emission intensity of terahertz generated by the ITO thin film is obviously higher than that of a full-transparent thin film which is annealed for a long time. According to the terahertz emission source, the problem that the nonlinear optical conversion efficiency is reduced due to excessive pursuit of film transparency in the prior art is solved, and a terahertz emission source preparation scheme which is simple in process, compatible with a CMOS (complementary metal oxide semiconductor) process and efficient is provided.

The application aims to provide a resonant cavity and high-power terahertz radiation source combining optimization of cascade difference frequency, comprising a first pump source and a second pump source, a non-periodic polarization APPLN crystal, a beam combining mirror, a phase delay system, a fifth mirror, a sixth mirror, a seventh mirror, an eighth mirror and a beamsplitter constituting a resonant cavity; the intensity of the terahertz wave can be enhanced, and the energy conversion efficiency of the terahertz wave can be improved. Through setting of the reflectivity of the cavity mirror, the Stokes light wave can be oscillated in the cavity, and the energy can be repeatedly transferred from the pump wave to the high-order Stokes wave.