6 results about "Gain" patented technology

The invention relates to a method for improving pumping light absorption efficiency of a non-polarization absorption gain medium. A pumping source, a polarization beam splitter, the non-polarization absorption gain medium and a pumping light recycling light path are included. Polarized pump light emitted by the pump source enters the polarization beam splitter, the polarization beam splitter highly transmits the polarized pump light and highly reflects polarized light perpendicular to the polarization direction of the polarized pump light, a part of the polarized pump light entering the non-polarized absorption gain medium is absorbed, the polarized pump light which is not absorbed enters the pump light recycling light path, the pump light recycling light path carries out 90-degree polarization direction conversion and light beam conversion on the polarization pump light which is not absorbed and then returns the polarization pump light to the polarization beam splitter, the polarization beam splitter reflects the returned polarization light to the non-polarization absorption gain medium, and the polarization light is absorbed by the non-polarization absorption gain medium again. The absorption efficiency of pump light of the non-polarization absorption gain medium is effectively improved, the structure is simple, special treatment does not need to be performed on the gain medium and an original resonant cavity, and safety is high.

The invention belongs to the technical field of gain materials, and discloses bismuth-thulium co-doped gain glass with an efficient broadband and a preparation method of the bismuth-thulium co-doped gain glass. The gain glass is mainly prepared from the following raw materials: GeO2, SiO2, Bi2O3 and Tm2O3; the molar dosage of the GeO2 is 10 to 40 percent, and the molar dosage of the SiO2 is 60 to 90 percent; the use amount of Bi2O3 is 0.001-5% of the total molar weight of GeO2 and SiO2, and the use amount of Tm2O3 is 0.01-5% of the total molar weight of GeO2 and SiO2. The method is a gas suspension furnace method. The gain glass provided by the invention has continuous ultra-wideband luminescence of 1000-2000 nm, and covers O, E, S, C, L and U wave bands. The method provided by the invention improves the luminous intensity of the glass material. The bismuth-thulium co-doped gain glass material is used as a gain medium to be used in the fields of optical fiber amplifiers and lasers.

The invention discloses a 50-degree circularly polarized conical beam antenna with 2.15 GHz frequency, which comprises a cylindrical support structure, a support arm arranged at the top end of the cylindrical support structure and a reflection disc arranged at the bottom end of the cylindrical support structure, the cylindrical support structure comprises an inner layer and an outer layer, a feed circuit is arranged in the cylindrical support structure, and the reflection disc is a disc containing distilled water. The antenna is simple in structure, proper in size, proper in working frequency, large in angle, high in gain and convenient for later design and debugging.

A passive imaging sensor includes a plurality of optical elements in which at least one includes one or more Micro-Electro-Mechanical System (MEMS) Micro-Mirror Arrays (MMAs) having a plurality of independently and continuously controllable mirrors that at least tip and tilt in 2 DOF and may tip, tilt and piston in 3 DOF. In an operational mode, the mirrors are tipped and tilted, and possibly pistoned, such that the optical radiation is focused at the pixelated detector to read out an image of the scene. NUC coefficients such as offset and/or gain are applied to either the output signals of the detector or to the image to form the NUC'd images. In a calibration mode, the mirrors are tipped and tilted and/or pistoned to spatially or temporally blur the image or to re-direct the FOV to one or more on-board calibration sources to generate a uniform image from which to calculate and update the NUC coefficients.

The invention discloses a distance measuring device, which comprises a light source, a polarization controller, a first electro-optical modulator, a second electro-optical modulator, an optical circulator, a coupler, a 1/4 wave plate, a reflector, an analyzer, a photoelectric detector, a low-pass filter, a signal source, a first automatic gain amplifier, a second automatic gain amplifier and a measurement control unit. The invention further discloses a distance measuring method, which comprises the steps of outputting sinusoidal signals with the frequency changing continuously by using the signal source, controlling the first electro-optical modulator and the second electro-optical modulator to modulate the measurement light at the same time, and measuring demodulation waveform parametersto calculate the distance to be measured. The device is simple in structure and high in environmental adaptability, measurement errors caused by non-reciprocal and non-flat electrical characteristicsof the modulator can be effectively suppressed, and large-dynamic-range high-precision absolute distance measurement can be realized at the same time.