Abstract: The present invention discloses a transverse mode switchable all-fiber high-order mode Brillouin laser. The laser comprises a narrow linewidth pump laser, an optical amplifier, a 1×N optical switch (N?2), a fiber mode selection coupler group, a first polarization controller, a fiber circulator, a fiber coupler, a second polarization controller, and a few-mode fiber. Based on the Brillouin nonlinear gain of a few-mode fiber in a ring cavity, the present invention realizes the resonance amplification of a specific order transverse mode in the cavity, and obtains the transverse mode switchable high-order mode laser beam output. The present invention, adopting an all-fiber structure, has the advantages of simple structure, low cost, easy fiber system integration, high stability and narrow linewidth of outputted laser beams, etc., and improves the practicality and reliability of high-order mode lasers.

Abstract: A tunable narrow-linewidth photo-generated microwave source based on polarization control includes a high-reflectivity fiber grating, a high-gain fiber, a low-reflectivity polarization-maintaining fiber grating, a stress adjusting device, a single-mode semiconductor pump laser, an optical wavelength division multiplexer, a polarization beam splitter, a polarization controller, an optical coupler, and a photoelectric detector. Birefringence distribution in the low-reflectivity polarization-maintaining fiber grating is controlled by adjusting a stress magnitude of the stress adjusting device to the low-reflectivity polarization fiber grating, thereby controlling a laser frequency working in different polarization modes in a resonant cavity, and a tunable narrow-linewidth photo-generated microwave source is generated by a beat-frequency technology using a dual-wavelength narrow-linewidth laser with variable frequency intervals.

Abstract: Disclosed is a method for breeding self-compatible potatoes, including the following steps: (1) selecting a self-compatible potato variety material and referring to it as PG6359, and cloning the S-RNase gene of PG6359 through the transcriptome sequencing method; and (2) obtaining two full-length sequences of the S-RNase gene from the cloned S-RNase gene in step (1) and referring to them as Ss11 and Ss12 respectively, and after carrying out an artificial self-pollination for the variety material PG6359, selecting the variety material having the genotype of Ss11Ss11 from the offspring as the female parent, and selecting a self-incompatible material as the male parent, and then obtaining a self-compatible F1 generation by hybridization. The invention overcomes the self-incompatibility of diploid potatoes, and does not require the introduction of any wild potato gene fragments, thereby avoiding linkage drag, and providing a basis for the rapid creation of a diploid potato inbred line.

Abstract: The present application relates to a light pulse signal processing system. A to-be-measured signal light source generates a to-be-measured signal light pulse, and the to-be-measured signal light pulse is transmitted to a cylindrical lens. The to-be-measured signal light pulse is converted into a to-be-measured signal light pulse having a spatial angle chirp by the cylindrical lens, and is outputted and is incident into a pair of long mirrors at different angles. The to-be-measured signal light pulse incident at different incident angles is delayed by the pair of long mirrors. A cluster of to-be-measured signal light pulses with a corresponding repetition rate is outputted to a beam combining mirror, and is combined with a cluster of reference light pulses by the beam combining mirror. A light signal analysis device analyzes the combined cluster of light pulses.

Abstract: A high-strength low-carbon bainitic fire-resistant steel and a preparation method thereof, belong to the technical field of low-carbon air-cooled bainitic fire-resistant steels. The problems of low yield strength, complicated production process and poor high-temperature mechanical properties of the fire-resistant steel in the prior art are solved herewith. The high-strength low-carbon bainitic fire-resistant steel disclosed herein have chemical components by mass percent of: 0.07%-0.1% of C, 0.7%-0.9% of Si, 1.0%-1.5% of Mn, 0.7%-0.8% of Cr, 1.0%-1.3% of Ni, 0.3%-0.35% of Cu, 0.6%-0.8% of Mo, 0.025%-0.035% of Nb, 0.09%-0.15% of V, 0.01%-0.015% of Ti, <0.2% of Nb+V+Ti, <0.02% of Alt, <0.003% of S, <0.008% of P, and the balance is Fe and inevitable impurities. Improvements are realized in the yield strength and high-temperature mechanical properties of the fire-resistant steel.

Abstract: Disclosed is a method for breeding self-compatible potatoes, including the following steps: (1) selecting a self-compatible potato variety material and referring to it as PG6359, and cloning the S-RNase gene of PG6359 through the transcriptome sequencing method; and (2) obtaining two full-length sequences of the S-RNase gene from the cloned S-RNase gene in step (1) and referring to them as Ss11 and Ss12 respectively, and after carrying out an artificial self-pollination for the variety material PG6359, selecting the variety material having the genotype of Ss11Ss11 from the offspring as the female parent, and selecting a self-incompatible material as the male parent, and then obtaining a self-compatible F1 generation by hybridization. The invention overcomes the self-incompatibility of diploid potatoes, and does not require the introduction of any wild potato gene fragments, thereby avoiding linkage drag, and providing a basis for the rapid creation of a diploid potato inbred line.

Abstract: Provided herein are materials and methods for producing diploid, fertile, uniform, and vigorous hybrid potato. Also provided are methods of using advanced breeding methods, such as genome design, to generate potato inbred lines with high homozygosity which enables the exploitation of heterosis in this tuber crop and transforms potato breeding from a slow, non-accumulative mode into a fast-iterative one.

Abstract: The present application relates to a real-time measurement method and system for ultrafast space-time-frequency three-domain information based on space-time-frequency compression.

Abstract: The present invention discloses an intelligent real-time full-field measurement method and system for a high-repetition-rate femtosecond pulse.

Abstract: The present application relates to a light pulse signal processing system. A to-be-measured signal light source generates a to-be-measured signal light pulse, and the to-be-measured signal light pulse is transmitted to a cylindrical lens. The to-be-measured signal light pulse is converted into a to-be-measured signal light pulse having a spatial angle chirp by the cylindrical lens, and is outputted and is incident into a pair of long mirrors at different angles. The to-be-measured signal light pulse incident at different incident angles is delayed by the pair of long mirrors. A cluster of to-be-measured signal light pulses with a corresponding repetition rate is outputted to a beam combining mirror, and is combined with a cluster of reference light pulses by the beam combining mirror. A light signal analysis device analyzes the combined cluster of light pulses.

Abstract: Disclosed are a method and a system for acquiring three-domain information of ultrafast light field. The method includes: acquiring time-domain information at positions of respective spatial points in a first signal to be measured; acquiring first frequency-domain information of continuous light portions at positions of respective spatial points in a second signal to be measured; acquiring second frequency-domain information of pulse light portions at positions of respective spatial points in a third signal to be measured; and fusing the time-domain information, the first frequency-domain information, and the second frequency-domain information, and determining three-domain information of an ultrafast light field signal according to information obtained by the fusion; wherein, the first signal to be measured, the second signal to be measured and the third signal to be measured are three signals obtained by splitting the ultrafast light field signal to be measured.

Abstract: The present invention relates to a method for searching for a structural gene of glass, including the following steps: determining atomic species for structure search according to the glass system; performing structural screening on the basis of the first principle to screen out compounds that can be formed by the interaction between each of the atoms; comparing the formation energy and the phonon spectrum of each compound to obtain stable compounds; and constructing a metastable composition diagram of a glass system according to the stable compounds, in metastable composition diagram, a micro-structural unit of a glassy compound near a target glass composition point is the structural gene of glass in the metastable glass composition diagram.

Abstract: Disclosed is a multimode interference effect-based wide tunable single-frequency optical fiber laser device. The laser device comprises a high-reflectivity chirped optical fiber grating, a high-gain optical fiber, a low-reflectivity chirped optical fiber grating, a pump source, an optical circulator, an optical fiber etalon and an SMS optical fiber structure apparatus. The high-reflectivity chirped optical fiber grating, the high-gain optical fiber and the low-reflectivity chirped optical fiber grating are connected in sequence to form a short linear resonant cavity; the optical circulator, the optical fiber etalon and the SMS optical fiber structure apparatus form a ring cavity, a stress loader is fixed onto the SMS optical fiber structure apparatus, and a transmitting wavelength of the SMS optical fiber structure apparatus is changed and tunable filtering by the SMS optical fiber structure apparatus is realized by loading stress to the SMS optical fiber structure apparatus.

Abstract: The invention discloses a multi-wavelength and single-frequency Q-switching optical fiber laser device. The laser device comprises a saturable absorber, a high gain optical fiber, a polarization-maintaining multi-wavelength narrow-band fiber Bragg grating, a resonant cavity temperature control module, a polarization-maintaining wavelength division multiplexer, a pump source and a polarization-maintaining light isolator. By taking a highly doped phosphate optical fiber as a laser gain medium, two ends of the optical fiber device are connected with the saturable absorber and the polarization-maintaining multi-wavelength narrow-band fiber Bragg grating respectively to form a short linear laser cavity.

Abstract: A method for performance prediction of a functional glass system, which includes the following steps: determining species of atoms for structural search according to components of a target glass system; performing structural search based on a first principle to search out compounds that can be formed by interaction between the atoms; comparing a formation energy and a phonon spectrum of each of the compounds to obtain stable compounds; constructing a glass structural composition diagram according to the stable compounds, microstructural units of a glassy compound adjacent to a target glass composition point are structural genes of the glass; and calculating a property of the target glass according to a leverage model formula of a multiplex glass system, the leverage model formula of the multiplex glass system being P0=?i=1nPi×Li.

Abstract: The present disclosure relates to a high-strength low-carbon bainitic fire-resistant steel and a preparation method thereof, and belongs to the technical field of low-carbon air-cooled bainitic fire-resistant steels. The present disclosure solves the problems of low yield strength, complicated production process and poor high-temperature mechanical properties of the fire-resistant steel in the prior art. The high-strength low-carbon bainitic fire-resistant steel, whose chemical components by mass percent are as follows: 0.07%-0.1% of C, 0.7%-0.9% of Si, 1.0%-1.5% of Mn, 0.7%-0.8% of Cr, 1.0%-1.3% of Ni, 0.3%-0.35% of Cu, 0.6%-0.8% of Mo, 0.025%-0.035% of Nb, 0.09%-0.15% of V, 0.01%-0.015% of Ti, <0.2% of Nb+V+Ti, <0.02% of Al, <0.003% of S, <0.008% of P, and the balance is Fe and inevitable impurities. The present disclosure improves the yield strength and high-temperature mechanical properties of the fire-resistant steel.

Abstract: A tunable narrow-linewidth photo-generated microwave source based on polarization control includes a high-reflectivity fiber grating, a high-gain fiber, a low-reflectivity polarization-maintaining fiber grating, a stress adjusting device, a single-mode semiconductor pump laser, an optical wavelength division multiplexer, a polarization beam splitter, a polarization controller, an optical coupler, and a photoelectric detector. Birefringence distribution in the low-reflectivity polarization-maintaining fiber grating is controlled by adjusting a stress magnitude of the stress adjusting device to the low-reflectivity polarization fiber grating, thereby controlling a laser frequency working in different polarization modes in a resonant cavity, and a tunable narrow-linewidth photo-generated microwave source is generated by a beat-frequency technology using a dual-wavelength narrow-linewidth laser with variable frequency intervals.

Abstract: Disclosed is an all-fiber optical vortex laser based on resonance of orbital angular momentum modes. The all-fiber optical vortex laser has an annular cavity structure, and includes a narrow-linewidth pump laser, an optical amplifier, an orbital angular momentum mode generator, a first polarization controller, an optical fiber circulator, an optical fiber coupler, a second polarization controller and a vortex optical fiber. The orbital angular momentum mode generator (3) realizes directional conversion from a fundamental transverse mode in a single-mode optical fiber into an orbital angular momentum mode with a specific topological charge in a vortex optical fiber. The optical fiber coupler can realize directional coupling from an orbital angular momentum mode in one vortex optical fiber to an orbital angular momentum mode in another vortex optical fiber; the vortex optical fiber is an optical fiber supporting stable transmission of an orbital angular momentum model.

Abstract: The present invention discloses a transverse mode switchable all-fiber high-order mode Brillouin laser. The laser comprises a narrow linewidth pump laser, an optical amplifier, a 1×N optical switch (N?2), a fiber mode selection coupler group, a first polarization controller, a fiber circulator, a fiber coupler, a second polarization controller, and a few-mode fiber. Based on the Brillouin nonlinear gain of a few-mode fiber in a ring cavity, the present invention realizes the resonance amplification of a specific order transverse mode in the cavity, and obtains the transverse mode switchable high-order mode laser beam output. The present invention, adopting an all-fiber structure, has the advantages of simple structure, low cost, easy fiber system integration, high stability and narrow linewidth of outputted laser beams, etc., and improves the practicality and reliability of high-order mode lasers.

Abstract: The present invention provides a repetition frequency-tunable optical frequency comb generated by basis of optical feedback. The optical frequency comb comprises a single-frequency laser resonant cavity, a wavelength division multiplexer, a single-mode semiconductor pump light source, an optical circulator, a first optical fiber coupler, a second optical fiber coupler, a photoelectric detector, a highly-stable signal source, an error signal processing system, a laser frequency modulation device and a tunable laser-delay module. The present invention performs delay-time processing to the single-frequency laser by the tunable laser-delay module, and achieves an optical feedback by the optical circulator for injecting to the resonant cavity, generating a series of tunable laser longitudinal modes with equal frequency space.