6results about How to "Improve frequency doubling efficiency" patented technology

The invention belongs to the technical field of terahertz communication, provides an annular combined full-band terahertz even harmonic frequency multiplier, and is used for solving the problem that a broadband frequency multiplier is relatively low in efficiency. The antenna comprises an input waveguide, an on-chip integrated circuit and an output waveguide, wherein the on-chip integrated circuit comprises an input probe, an input matching microstrip line, an annular combined structure, an output matching circuit and an output probe; the annular combined structure is formed by connecting two signal branches in parallel, each signal branch is formed by connecting a band-pass filter and a diode array in series, and the diode arrays in the two signal branches form an anti-parallel structure. An annular combined structure is provided, a high-frequency-band narrow-pass-band filter and a low-frequency-band narrow-pass-band filter are arranged on two signal branches of the annular combined structure respectively, signals are improved from full-frequency-band filtering to two narrow-band filtering, and finally the two narrow-band signals are combined into a broadband signal. Therefore, the full-band frequency multiplication efficiency of the device is improved.

The invention discloses a frequency multiplication type power synthesis structure and terahertz equipment, which are applied to the technical field of terahertz, and comprise an input E-plane T / Y junction and an output E-plane T / Y junction, the input E-plane T / Y junction is provided with two branches, and the polarities of electric fields of signals in the two branches are opposite; one branch is connected with one input end of the output E-plane T / Y-type junction through a frequency doubling unit, and the other branch is connected with the other input end of the output E-plane T / Y-type junction through another frequency doubling unit; the frequency doubling unit comprises a connecting branch and a microstrip line of an output E-plane T / Y junction input end, and the microstrip line is sequentially connected with a balanced frequency doubling diode pair and a monopole-like antenna in the signal transmission direction of the microstrip line; the monopole-like antenna is used for regulating and controlling the polarity of an electric field of a signal in the connected microstrip line, so that the polarities of the electric fields of the signals transmitted to the two input ends in the output E-plane T / Y-type junction are the same. The polarity of an electric field in each microstrip line is individually regulated and controlled in a targeted manner through the monopole-like antenna, and the frequency doubling synthesis efficiency is improved.

The invention relates to a high-power green laser synthesis system based on a rotary frequency doubling crystal and multiple beams of infrared pulse laser, and belongs to the technical field of laser. The system comprises a multi-beam pulse infrared laser device, a frequency doubling crystal module, an annular rotating mechanism, a beam combining device, a continuous infrared laser device, a laser frequency regulation and control device and a rotating driving control system. The four beams of pulse infrared laser sources are symmetrically arranged along the circumferential edge, and periodically staggered output is realized through frequency regulation and control; the multiple frequency doubling crystals are distributed along the rotating circular ring at equal intervals and are sequentially aligned with laser pulses under driving of the rotating mechanism, and efficient frequency doubling is achieved. The center continuous infrared laser generates stable green light through frequency doubling of the fixed crystal. Finally, the green light generated by the multiple frequency doubling crystals and the central green light are integrated into a single light beam through a beam combining device to be output. According to the system, the power upper limit and the stability of green laser are remarkably improved through energy sharing of polycrystals, rotary dynamic matching and annular cooling, and the problems that existing green laser is limited in power and serious in heat effect are solved.

The invention relates to a tunable narrow-linewidth Raman fiber laser generating device and method, the tunable narrow-linewidth Raman fiber laser generating device comprises a pump laser, a Raman fiber, a flat weak reflector and an adjustable narrow-band filter, the pump laser is respectively connected with the Raman fiber and the flat weak reflector, and the adjustable narrow-band filter is connected with the Raman fiber and the flat weak reflector. The light source is used for providing pump light and Stokes light for the Raman optical fiber and the flat weak reflector respectively; the Raman optical fiber is used for converting the pump light into Raman laser and improving the energy level of the Raman laser; the flat weak reflector is used for reflecting Stokes light generated in the Raman laser scattering process back to the Raman optical fiber; and the adjustable narrow-band filter is connected with the flat weak reflector and is used for receiving the Raman laser and providing sub-nanoscale tunable reflection laser to the flat weak reflector. A double-feedback mechanism combining flat weak reflection and narrow-band tunable filtering is provided, more control dimensions are provided for compressing the laser line width, and therefore the frequency doubling efficiency is improved.

A three-point temperature compensated 473nm blue continuous laser, which consists of four parts: a pump source and a pump coupling part, a resonant cavity and an intracavity frequency doubling part, an output beam shaping part, and a three-point temperature compensation temperature control part. It can provide the necessary blue light monochromatic reference light source for applications such as spectral analysis, biological analysis, and three-primary color matching. The 473nm blue laser can continuously output 473nm blue laser, with an output power greater than 1W, a power stability better than 1%, a light-to-light conversion efficiency from pump light to output light greater than 18%, an output beam diameter of 10mm, a divergence angle less than 0.05mrad, and an output wavefront PV less than λ / 3.

The invention provides a temperature control furnace structure and a control method. The temperature control furnace structure comprises a shell, the interior of the shell is hollow, the two sides of the shell protrude outwards, and a plurality of heat insulation pieces are arranged in the shell; the crystal seat is arranged on the plurality of heat insulation pieces, and a groove with two through ends is formed in one side of the crystal seat; a groove is formed in the shell, the frequency doubling crystal is arranged in the groove, transmission holes penetrating into the shell are formed in the protrusions on the two sides of the shell, window pieces are arranged in the transmission holes, and the pressing mechanism is arranged on the side, away from the heat insulation piece, of the crystal holder; the heating piece is arranged on one side of the crystal holder close to the heat insulation piece; the structure ensures the stability of the working temperature of the frequency doubling crystal, a target model of the relationship between the frequency doubling power and the working temperature is constructed by collecting real-time frequency doubling power data at different working temperatures, and the working temperature enabling the frequency doubling power to reach the optimal is found through a genetic algorithm based on the target model, so that the working temperature of the frequency doubling crystal is optimized. And the working stability and reliability of the temperature control furnace are ensured under the condition that the external conditions are severe or changed.