51results about How to "Improve frequency conversion efficiency" patented technology

The invention provides an optical frequency converter in the visible to ultraviolet band. By controlling the processing period of the nonlinear optical crystal to provide an additional periodic phase to meet the phase matching condition, effective optical frequency conversion is realized. The additional periodic phase is a phase grating with different refractive index periodic arrangements inside the crystal formed by laser micromachining, ion etching and other technologies, and the reverse process of nonlinear frequency conversion is prevented by the destruction of the periodic structure of the crystal in the phase grating and an additional period is provided. Phase, to make up for the phase mismatch caused by the lack of natural birefringence of nonlinear optical crystals, to achieve effective frequency multiplication or sum frequency output. The present invention can optimize nonlinear optical materials, and can also select appropriate crystals according to required wavelengths to provide matching additional periodic phases through processes such as laser lithography, so as to realize effective output of specific wavelengths. The invention provides a new type of nonlinear optical frequency conversion device, and has the advantages of high optical frequency conversion efficiency, easy preparation and the like.

The invention discloses a high-power blue optical fiber laser, which contains front end input coupling device, wherein the first optical fiber device is set behind the front end input coupling device; the first optical fiber device, multiple frequency device and second optical fiber device connect to form resonant cavity through optical fiber; the resonant cavity is changed into activating cavity excited by double-end pump of front end input coupling device and rear end pump device; the laser working material is fiber core material of optical fiber system double-layer optical fiber, which outputs high-power blue laser through output aligning lens after realizing cavity multiple frequency. The invention improves switching efficiency, which is applied in the laser reserving, image display, laser TV and seawater communication domains widely.

A Mg-doped lithium niobate crystal with periodically polarized microstructure is prepared frmo Mg-doped lithium niobate powder through growing crystal by Czochralsk method, gas-phase balanced diffusion and low-voltage polarizing at room temp. to make the crystal have periodic structure. It can be used to make optical device. Its advatages are high resistance to optical damage and high uniformity.

The invention discloses a method for preparing a KTP crystal capable of resisting gray track, comprising the following steps that: 1) KH2PO4 and TiO2 as raw materials used to synthesize a KTiOPO4 crystal, and K2HPO4 as the raw material used to synthesize a K4P2O7(K4) solvent are mixed according to a certain ratio, and the initial growth mol ratio of the KTiOPO4 to the K4P2O7 obtained after the chemical reaction is about 0.8; 2) the mixed raw materials are put in a platinum crucible and the solution filling amount is between 75 and 85 percent; 3) the platinum crucible is put in a furnace body,a temperature gradient of the furnace is set to be between 3 and 8 DEG C per 10 centimeters, and the furnace is heated so that the raw materials are melted and react to form an even and stable high temperature solution; and 4) the seed crystal is put in the high temperature solution, the temperature is reduced at a temperature gradient of between 1 and 8 DEG C per 100 hours, and the KTiOPO4 crystal is grown at a temperature interval of between 850 and 820 DEG C. The method utilizes the K4P2O7 solvent to prepare the KTP crystal, reduces the absorption coefficient of the KTP crystal, and has evident anti-gray track performance; therefore, the frequency multiplication conversion efficiency of the KTP is improved further, the KTP crystal has good voltage withstanding and modulation performances and can be used as an electrooptical crystal.

The invention provides a 266-nm pulse solid laser that is free of a pumping coupling system, small in size and simple in structure; picosecond pulse width fundamental frequency light can be output in a four-section bonding crystal passive Q-switching mode, and then picosecond 266-nm laser can be output; the frequency doubling conversion efficiency can be improved by focusing 1064-nm laser to perform frequency doubling and collimating 532-nm laser to perform frequency quadruplicating; the quadruplicated frequency crystal adopts a non-critical phase matching high-temperature working mode, so that the quality of a 266-nm laser beam is greatly improved, and deliquescence of the CLBO crystal is effectively prevented; the shift point design of the quadruplicated frequency crystal can effectively prolong the service life of the laser.

A large-aperture laser frequency multiplication conversion and focusing device with a crystal temperature regulating and control function solves the problems that large-aperture laser frequency multiplication conversion and focusing devices in the prior art do not have the temperature regulating and control function and cannot achieve non-critical phase matching. A focusing lens, an adapting flange, a quadruple frequency conversion module, a first light pipe, a double frequency conversion module and a second light pipe are arranged from left to right one by one. The focusing lens is fixedly connected with the adapting flange which is fixedly connected with the quadruple frequency conversion module fixedly connected with the first light pipe. The first light pipe is fixedly connected with the double frequency conversion module which is fixedly connected with the second light pipe. The quadruple frequency conversion module and the double frequency conversion module are fixed on a support. The quadruple frequency conversion module employs dual temperature control technology to achieve conversion from double frequency to quadruple frequency. The focusing lens achieves focusing of high-energy laser. The device is used for frequency multiplication conversion of high-flux large-aperture laser.