11 results about "Scattering loss" patented technology

This invention discloses a heterogeneous integrated electro-optic modulator and its alignment method based on write field splicing compensation, relating to the field of silicon-based optoelectronics technology. The modulator comprises, from bottom to top, a silicon substrate with a thermal oxide layer, a bottom patterned waveguide layer, an intermediate transition dielectric layer, a top electro-optic thin film layer, and a top traveling-wave electrode structure. The bottom waveguide layer has a write field splicing region along the light propagation direction, within which a thermal compensation structure is configured, and a dedicated alignment mark is provided within a designated area. This mark is formed synchronously with the waveguide layer and the compensation structure within the same photolithographic write field. The top traveling-wave electrode structure is overlaid across layers based on this mark, forming a predetermined spatial matching relationship with the write field splicing region. This invention can solve the problems of optical scattering loss caused by long-distance bottom waveguide field-separated exposure splicing and the limited accuracy of cross-layer overlay after heterogeneous bonding, and achieves precise overlay positioning of the cross-layer traveling-wave electrode.

A system for measuring roughness of a core sidewall of an optical waveguide based on mode excitation is provided, in which an optical waveguide to be measured is arranged between a few-mode long-period fiber grating and an optical power meter; the laser beam is incident on the optical waveguide to be measured after passing through the few-mode long-period fiber grating, and then is incident on the optical power meter after being subjected to a scattering loss caused by the roughness of the core sidewall of the optical waveguide to be measured; and the processor is configured to calculate an equivalent value of the roughness of the core sidewall according to the output power detected by the optical power meter, the output modes of the few-mode long-period fiber grating and the mode of the optical waveguide to be measured.

The application provides a suspended optical mechanical system, comprising a first substrate block, a suspended waveguide, a suspended support beam, a plurality of support tether groups, a suspended detection mass and an optical cavity, wherein the suspended waveguide comprises a linear main body part extending along an X direction and a plurality of connection parts arranged in sequence and at intervals along the X direction, and the support tether groups are connected to the section of the suspended waveguide with the connection parts, the stability of the connection of the support tether and the suspended waveguide is increased, the width of the suspended waveguide at the connection parts is enlarged, the optical mode can be well limited in the waveguide, and the influence of the support tether on the optical mode is minimized. The tapered part of the connection part ensures the singularity of the mode in the process of light field transmission and slows down the change trend of the width of the suspended waveguide, which is beneficial to reduce the scattering loss and further increase the quality factor. The connection part arranged on one side can ensure that the gap width between the suspended waveguide and the optical cavity is constant, thereby ensuring the optimal coupling efficiency.

The present invention relates to the technical field of semiconductors and discloses a side-emitting single-mode laser with a waveguide having an oxidized aperture hole and its manufacturing process, which prepares an oxidized aperture hole as an optically limited waveguide structure of a single-mode laser, wherein the partially insulated oxidized aperture hole limits the current injection window, which leads to a high current injection efficiency and a low leakage current of the device, while at the same time the side walls of the waveguide have lower scattering losses, which leads to a more pronounced suppression of higher modes and promotes the realization of a high-power single-mode laser with extremely low threshold current density.In the present invention, a structure with a surface grating is also introduced, thereby enabling the design of a single-mode laser with a high grating coupling coefficient, wherein the preparation process is simple, reliable and highly reproducible, which avoids complex secondary epitaxy processes, thereby reducing the risk of chamber contamination and promoting the reproducible preparation of high-quality gratings, thus enabling the realization of multi-wavelength arrays.

The application discloses a kind of for single-color multimode laser output spherical host-guest type micro-nano laser and its preparation method, the micro-nano laser is by the spherical metal organic hybrid material host with distortion topological network structure and laser dye guest composition.Wherein the composition of spherical metal organic hybrid material host is:Zn, organic ligand 2,4,6-tri (3,5-dicarboxyphenyl amino) -1,3,5-triazine, N,N-dimethylformamide.Guest is laser dye.The application is based on spherical metal organic hybrid material as the resonant cavity of micro-nano laser, utilizes its super-smooth surface and excellent circular boundary, avoids boundary scattering loss, effectively provides sufficient feedback for laser oscillation, realizes single-color multimode laser output with high quality factor, narrow half-width, wide mode interval and low laser threshold.Effectively solve the problem that existing micro-nano laser is mostly crystal material, and there is a lot of boundary scattering loss.

The application discloses a low-scattering silicon master mold surface smoothing post-processing method and system applied to the field of micro-nano optical master mold manufacturing, and operates according to a closed loop route of baseline measurement-parameter generation-sacrificial oxidation / removal-remeasurement-gating-output: firstly, the baseline profile, surface roughness, scattering loss under multiple working wavelengths and process constraints of the silicon master mold to be processed are acquired; then, a post-processing parameter set p_post is generated or updated, wherein the p_post at least includes a target oxidation thickness d_ox, an oxidation temperature T_ox, an oxidation time t_ox, removal liquid parameters and a maximum cycle number N_cycle; after that, a sacrificial layer is formed by sacrificial oxidation and the sacrificial layer is removed, and then the surface roughness sigma_rms, the scattering loss L_s(lambda_i) and the profile retention error Delta h_rms are re-measured, and whether to continue to enter the next round of smoothing is judged according to a three-index joint gating rule; when the three indexes meet the requirements at the same time, a reproducible low-scattering silicon master mold, an acceptance report and a traceability data package are output.

This invention discloses a single-crystal acoustic resonator, filter, and multiplexer based on the lateral acoustic bandgap of a phononic crystal, belonging to the field of bulk acoustic resonator technology. It includes a single-crystal piezoelectric layer with an effective resonant region and a passive region surrounding the effective resonant region. An acoustic reflection structure is disposed on the passive region of the single-crystal piezoelectric layer, comprising multiple phononic crystal holes arranged in a periodic array around the effective resonant region. This invention's single-crystal acoustic resonator based on the lateral acoustic bandgap of a phononic crystal aims to solve the lateral energy leakage problem existing in existing single-crystal AlN-based bulk acoustic resonators, as well as the shortcomings of traditional solutions in terms of mechanical stability, broadband coverage, and scattering loss, achieving the effects of effectively suppressing parasitic modes, reducing energy loss, and improving the resonator's quality factor.

The application relates to the technical field of resonant cavities, in particular to a powder material dielectric property separation type cylindrical resonant cavity based on a quasi-optical cavity, which comprises a box body, an upper cavity, a sample bin and a lower cavity are arranged in the box body, the upper cavity is in a cylindrical structure, the material of the sample bin is flexible polytetrafluoroethylene, magnetic attraction points are respectively arranged on the top and the bottom of the sample bin, the top of the sample bin is magnetically connected with the upper cavity, and the bottom of the sample bin is magnetically connected with the lower cavity; the lower cavity is in a cylindrical structure, a heat insulation sleeve is arranged on the surface of the lower cavity, and a wave-absorbing material layer is attached to the inner wall of the lower cavity; the diamond coating has superhard characteristics and extremely low surface roughness, can significantly reduce the scattering loss of electromagnetic waves on the inner wall of the cavity, can quickly dissipate the heat generated by electromagnetic energy in the cavity, and can inhibit the influence of temperature fluctuation on the Q value; the cavity is divided into three parts, i.e. an upper part, a middle part and a lower part, and is connected through the magnetic attraction points to form a modular quasi-optical cavity, and in combination with the wave-absorbing material layer and high-precision processing, single-mode purity can be realized.

This invention proposes a gallium nitride-based semiconductor laser with a gradient optical field waveguide layer. The fitting curves of the In ion intensity distribution or In atom concentration distribution, refractive index distribution, and optical absorption coefficient distribution obtained from SIMS testing of both the upper and lower waveguide layers satisfy any one of the ExpGro1, ExpGro2, ExpGro3, and Shah functions. This allows for the synergistic control of optical field confinement, loss suppression, and carrier distribution, thereby regulating the laser's optical field distribution. The fabricated gradient refractive index waveguide layer, satisfying the relevant function distribution, confines photons generated by the active layer within the waveguide, smoothing the optical field within the waveguide layer. This eliminates reflection and scattering losses caused by abrupt refractive index differences at the interface, reduces light field penetration into the confinement layer, lowers optical leakage and threshold losses, suppresses the excitation of higher-order transverse modes, achieves stable fundamental mode output, improves the laser's mode stability and beam quality factor, and reduces the horizontal divergence angle.

The application relates to the technical field of screens and discloses a preparation method of a large-area flexible scintillator screen based on a doctor-blade forming technology, which comprises the following steps: S1, providing a flexible transparent base material; S2, coating a scintillator slurry on the surface of the base material, wherein the slurry comprises scintillator particles, a polymer matrix and an organic solvent; S3, adopting the doctor-blade forming technology, and scraping the slurry into a wet film with a uniform thickness through a doctor blade with an adjustable gap; S4, gradient drying of the wet film to evaporate the solvent, so as to form a flexible scintillator functional layer; and S5, covering a protective layer on the surface of the functional layer to package into a screen structure. Through the combined use of three synergistic modification technologies of argon plasma treatment on the surface of the base material, modification of the scintillator particles by a silane coupling agent and design of a multimodal particle size distribution, the interface light scattering loss can be reduced, the visible light transmittance and the X-ray conversion efficiency can be improved, and the requirements of high-precision imaging scenes such as medical CT on optical uniformity and resolution can be met.

An object of the present disclosure is to provide an optical fiber having a simple structure, as well as attaining removal of loss components generated in an electric field part oozing out to a core-clad interface or a clad region and reduction in scattering loss generated from an interface with the clad region.The present disclosure relates to an optical fiber including a core for propagating light, a cladding disposed around the core, an air layer between the core and the cladding, and two or more bridges for supporting the core in the air layer.