74results about How to "Wide working wavelength range" patented technology

The invention belongs to the technical field of light beam conversion, in particular to a method for generating a bezier-like light beam through an optical fiber end face growth microcone. The methodcomprises the following steps of: depositing a photopolymer liquid reagent on the end face of a single-mode optical fiber, coupling green laser into the single-mode optical fiber through a lens, and reacting with the photopolymer liquid reagent deposited on the end face of the single-mode optical fiber to form a polymer microcone; wherein the light beam is converted into a bezier-like light beam after passing through the polymer microcone formed by the end face of the optical fiber. The shape of the microcone is controlled by light polymerization parameters such as green laser power, laser exposure time and oxygen diffusion concentration. The working bandwidth of the microcone covers the whole visible light region and even the near infrared band, and can have more than 30 concentric ringsat most, and the generated Bezier-like beam has self-recovery property. The method has the advantages of high efficiency, low cost and convenience, and can be widely applied to the fields of particlecontrol, optical imaging, nonlinear optics, photoetching, micro-manufacturing and the like.

A method and a device for realizing a low-cost tunable semiconductor laser based on a reconstruction-equivalent chirp technology belong to the technical field of optoelectronics, and relate to the design and manufacture of a complex distributed feedback tunable semiconductor laser. The invention aims to provide a low-cost tunable distributed feedback semiconductor laser for the future WDM-PON market by adopting the reconstruction-equivalent chirp technology for low-cost manufacture. The basic technology is that a plurality of distributed feedback semiconductor lasers of different wavelengths are integrated on the same chip through a series/parallel hybrid mode, and a mode of crosstalk isolation between adjacent laser chips is provided. According to the invention, DFB lasers of different working wavelengths based on the reconstruction-equivalent chirp technology are integrated by a series/parallel combination mode, one of the lasers is selected by current to work, and the working wavelength of the laser can be controlled by adjusting the temperature or current, thus realizing continuous tuning of the working wavelength of the laser.

The invention discloses a polarization controller based on graphene, and relates to the technical field of photoelectronics. The polarization controller is based on a traditional silicon (SOI) structure on an insulator substrate and comprises a waveguide with the graphene, a vertically embedded graphene layer is arranged on one segment in the waveguide, a horizontally embedded graphene layer is arranged on the other segment of the waveguide, and graphene in the two waveguide segments is connected through two independent electrodes. Absorption of the two waveguide segments on a TM mode (transverse magnetic mode) and a TE mode (transverse electric mode) is regulated and controlled through driving voltage applied to the graphene layers, and therefore selective output on the TE mode and the TM mode is achieved. The polarization controller has the advantages of being small in size, high in extinction ratio, small in inserting loss, high in response speed, wide in work wavelength range and capable of being integrated, and has the important application prospect in optoelectronic integration in the future.

Techniques for designing optical devices with high isolation are disclosed. The high isolation is achieved by causing a reflected light signal to go through another filter. According to one embodiment, an optical apparatus comprises a first optical filter configured to transmit a first selected wavelength and reflect all other wavelengths, a second optical filter the second optical filter configured to transmit a second selected wavelength and reflect all other wavelengths. The first optical filter, being not perfect and producing a reflected signal with a residual of a signal at the first selected wavelength, the residual of the signal is minimized by the second optical filter when the reflected signal is impinged upon the second optical filter.

The invention discloses a silicon-based polarization beam splitting rotator based on adiabatic cone asymmetric coupling and a Y branch. According to the rotator, silicon dioxide is adopted as a substrate and a coating layer; a buffer layer made of a silicon material is additionally arranged between the substrate and the coating layer, and a ridge waveguide is constructed on the buffer layer, and therefore, a polarization beam splitting rotator main body can be formed. The ridge waveguide is composed of three sections of structures. The first section is of a heat insulation conical structure, the width of the first section gradually changes from W1 to W2, and conversion from a TM0 polarization mode to a TE1 polarization mode is achieved in a waveguide 1; the second section adopts an asymmetric coupling structure and a heat insulation conical structure to realize polarization beam splitting and rotation from a waveguide 1 to a waveguide 2; and the third section consists of a Y branch andis connected with the second section through an S-shaped bent structure to realize second-stage polarization beam splitting and rotation. The silicon-based optical polarization beam splitting rotatorhas the advantages of large working wavelength range, high extinction ratio, low loss and the like, and has important application in systems of optical communication, photoelectric signal processingand the like.

The present invention discloses an imaging spectrometer on the basis of an etched diffraction grating. The imaging spectrometer comprises an imaging system and an integrated chip mainly integrating a first splitting system or a second splitting system. After an input light is imaged to a space light through the imaging system, the space light is subjected to light splitting output through the first splitting system, or the space light is subjected to light splitting output through the second splitting system after the space light is processed or focused through a digital micromirror array light switch and a cylindrical mirror. According to the invention, the weight and the volume of the imaging spectrometer are greatly mitigated, the integrated level is high and the stability of the system is enhanced; and moreover, the imaging spectrometer on the basis of etched diffraction grating has a wide-range spectrum and good system function expansibility and is applicable to the remote sensing detection of a small unmanned aerial vehicle.

The invention provides a few-mode fiber device. The fiber core of the few-mode fiber device is formed by a main fiber core and auxiliary fiber cores, wherein the normalized frequency Vm of the main fiber core is larger than 2.405, and the number of the auxiliary fiber cores is M which is larger than or equal to 1. One end of each of the auxiliary fiber cores intersects with the side face of the main fiber core, and the central axis of the main fiber core and the central axes of the auxiliary fiber cores are on the same plane. The other end of each of the auxiliary fiber cores is on an optical fiber end face, and in the end face, the central distance between any two fiber cores is larger than the sum of the radii of the two fiber cores. The parameter between any auxiliary fiber core and the main fiber core satisfies a condition that the refractive index of at least one transmission mode of the main fiber core is lower than the effective refractive indexes of the auxiliary fiber cores. The invention provides the novel few-mode fiber device, and the conversion, combination, separation or elimination of the modes in a few-mode fiber can be realized.

A passively Q-switched fiber laser system comprises a pump source and an ring cavity connected with each other. The ring cavity comprises a gain fiber, a directional coupler and a saturable absorber connected in order. The saturable absorber is a quantum-dot polymer composite film, which is fabricated by a simple method comprising steps of: mixing a quantum dot material of lead sulfide (PbS) with a colloidal polymer to form a mixture; and drying the mixture at two different temperatures in two stages respectively. The saturable absorber of the present invention has lower saturating intensity and a plurality of absorption bands comprising 1000 nm to 1100 nm and 1500 nm to 1600 nm. The maximum output power and the maximum pulse energy of the passively Q-switched fiber laser system can be superior to those laser systems using the quantum-dot (QD) polymer composite film as saturable absorber.

The invention discloses an electro-optical polymer waveguide mode conversion switch for a mode multiplexing technology, and is applied to the field of optical communication. Aiming at the problems ofinsufficient stability, structure complexity, relatively slow conversion speed, insufficient working wavelength range and the like of an existing reconfigurable mode converter, a mode switch of voltage control and electric tuning is achieved by electro-optical effects of a long-period grating structure and an electro-optical polymer, and a novel electro-optical mode converter is constructed; and the device has the advantages of rapid conversion speed, low half-wave voltage, low cost and the like and has good actual application value.

The invention relates to the technical field of optics, in particular to a polarization beam splitter and a forming method thereof. The polarization beam splitter includes a substrate, and a first waveguide, a slit waveguide and a second waveguide which are located on the surface of the substrate and extend in a first direction. The first waveguide, the slit waveguide and the second waveguide arearranged in parallel in a second direction perpendicular to the first direction, and the slit waveguide is located between the first waveguide and the second waveguide. The first direction is the propagation direction of light, and the first direction and the second direction are both parallel to the substrate. Transverse magnetic polarized light in the light can be coupled to the second waveguidefrom the first waveguide through the slit waveguide. According to the invention, separation of a TM polarization mode and a TE polarization mode in light is realized, and the polarization beam splitter has a plurality of potential applications in the aspects of polarization multiplexing, sensing and the like in the future.

The invention discloses a miniature spectrum testing system. The system comprises a light beam collimation module and a photoelectric detection module; light to be tested is collimated by the light beam collimation module, and then the collimated light to be tested is projected to the photoelectric detection module; the photoelectric detection module comprises a rotatable semiconductor substrate layer and a metal or metal-like material film covering the semiconductor substrate layer; and the light facing surface of the photoelectric detection module is prepared into a grating. The invention further discloses a spectrum testing method. The method comprises the following steps that: a light beam of a to-be-tested spectrum is collimated; the photoelectric detection module is rotated, and electric signals corresponding to each rotating angle are recorded and analyzed, and the light intensity information of each wavelength light in the to-be-tested spectrum is realized according to the light intensity information corresponding to the wavelengths in the spectrum. The method has the advantages of high-spectral resolution, large-working wavelength range and high-integration level spectral testing capability.

The invention discloses a compact detection system for realizing handheld terahertz reflection spectrum detection. The detection system comprises a terahertz detection head optical subsystem which consists of a collimating lens group, a beam shrinking lens group, a THz turning light path, a THz window and a 3D printed detection head structure; a terahertz source subsystem which is composed of a femtosecond laser, an optical fiber and coupler and a THz emitter; and a terahertz detector subsystem which is composed of a femtosecond laser, an optical delay line, an optical fiber and coupler, a THzreceiver, an amplifier and a computer. The terahertz detection head optical subsystem inputs divergent terahertz waves emitted by a terahertz source on the surface of a detection substance in a uniform and collimated mode and enables reflected terahertz waves to be focused on the receiving surface of the terahertz detector; the terahertz waves emitted by the terahertz source are firstly collimated into uniform parallel light through the collimating lens group, then the uniform parallel light is emitted from the terahertz window through the turning light path to irradiate the surface of the detection substance, and finally the reflected terahertz waves are focused to the photosensitive surface of the THz receiver through the beam shrinking lens group through the terahertz window and the turning light path.

The invention provides a graphene-assisted vanadium oxide thermo-optical modulator and a preparation process thereof. The modulator comprises a substrate, wherein a first insulating layer is formed on the surface of the substrate, a graphene layer is disposed on the first insulating layer, and a second insulating layer is formed above the graphene layer. The graphene-assisted vanadium oxide thermo-optical modulator further comprises a metal electrode and a vanadium oxide thin film layer, wherein the metal electrode is arranged on the graphene layer through photoetching or deposition, and the vanadium oxide thin film layer is arranged on the second insulating layer in a magnetron sputtering, reactive ion sputtering or deposition metal reoxidation mode. The advantages are that excellent characteristics of graphene and vanadium oxide are fully utilized, and characteristics of small size, low insertion loss, high extinction ratio and wide operating wavelength range are realized.

The invention relates to an optical lens assembly for generating a super-chirality light field and belongs to the application optics field. The assembly includes a cone beam reflector, a beam collimation block, an optical glass plate and a beam gathering block, wherein the incident light is a helically radially polarized beam. The proposed optical lens structure can regulate the propagation direction of the incident light, helical radially polarized beams are concentrated onto a central axis in a direction perpendicular to the central axis, and the super-chirality light field is achieved on the central axis.

The invention relates to an optical fiber probe. The invention relates to a probe, in particular to a double-side-coated hollow double-core PCF-SPR probe which works in a solution environment and hashigh sensitivity. The double-side coated hollow double-core PCF-SPR probe is a photonic crystal fiber, a central air hole is formed in a cladding of the photonic crystal fiber, an inner gold film is coated on the inner wall of the central air hole, an outer gold film is coated on the outer wall of the cladding, and two fiber cores are positioned between the inner gold film and the outer gold filmand are symmetrically distributed to form the double-core symmetrical photonic crystal fiber. The probe can enable the fiber core guide mode and the plasma films on the two sides to resonate at the same time; the resonance phenomenon is obviously enhanced compared with single-side coating; the average spectral sensitivity of the fluorescent probe is 22571.43 nm/RIU; the average spectral sensitivity is 20 times that of a single-side coating film; the wide working wavelength range is 1000 nm to 3400 nm; the device is simple in structure, reasonable in design, affordable and easy to apply practically.