181 results about "Achromatic lens" patented technology

An element-specific imaging technique utilizes the element-specific fluorescence X-rays that are induced by primary ionizing radiation. The fluorescence X-rays from an element of interest are then preferentially imaged onto a detector using an optical train. The preferential imaging of the optical train is achieved using a chromatic lens in a suitably configured imaging system. A zone plate is an example of such a chromatic lens; its focal length is inversely proportional to the X-ray wavelength. Enhancement of preferential imaging of a given element in the test sample can be obtained if the zone plate lens itself is made of a compound containing substantially the same element. For example, when imaging copper using the Cu La spectral line, a copper zone plate lens is used. This enhances the preferential imaging of the zone plate lens because its diffraction efficiency (percent of incident energy diffracted into the focus) changes rapidly near an absorption line and can be made to peak at the X-ray fluorescence line of the element from which it is fabricated. In another embodiment, a spectral filter, such as a multilayer optic or crystal, is used in the optical train to achieve preferential imaging in a fluorescence microscope employing either a chromatic or an achromatic lens.

The present invention discloses an apparatus for measuring spectrum and image with high spatial resolution and spectral resolution. The apparatus comprises an imaging side telecentric lens for collecting light from an object, an optical slit positioned behind the imaging side telecentric lens, an aspheric lens for collimating lights from the optical slits, a dispersing device for separating the lights of different wavelengths into a plurality of sub-rays of different entrance angle, an achromatic lens for focusing the sub-rays, and an optical sensor for detecting the optical intensity of the sub-rays. The dispersing device can be a transmission or reflection diffraction grating, and the optical sensor may consist of a plurality of photo-detectors positioned in a two dimensional array.

A lens assembly for an optical imaging lens is disclosed, which includes a first lens, wherein the first lens has a negative power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein the sixth lens has a positive power, wherein the second lens and the third lens define a first cemented achromatic lens assembly, and the fourth lens and the fifth lens define a second cemented achromatic lens assembly, wherein the first lens, the first cemented achromatic lens assembly, the second cemented achromatic lens assembly and the sixth lens are orderly arranged along the direction from the object side to the image side.

A symmetric relay system for endoscopes includes an optically-aligned pair of elongated concavo-convex rod-type lenses formed from crown glass, to the convex end surface of each of which a meniscus-shaped flint lens is cemented. The concave ends of the rod lenses are disposed to face the intermediate images of the relay system, and the convex ends to face the aperture of the relay system. A pair of achromatic lenses, each formed of a pair of lens elements x, y, are disposed adjacent and in optical alignment with the respective concave ends of the rod lenses between the concave rod ends and the intermediate images. Each achromatic lens fulfills the condition n x / ny=vx / vy. Apochromatic glass combinations may be used in the rod lenses to significantly reduce the secondary spectrum.

An improved illuminator with an adjustable beam pattern to be worn by medical and dental professionals includes a housing, a light-emitting diode (LED) disposed in the housing outputting light through a distal opening in the housing, an achromatic doublet lens mounted in the opening in the housing, and a singlet lens disposed between the LED and the achromatic lens. The distance between the singlet lens and the doublet lens may be adjustable, and / or distance between the LED and the singlet lens may be adjustable, through a threaded connections, for example.

Disclosed herein is an optical coherence tomography (OCT) imaging system having a wide field of view and comprising a handheld imaging probe. The handheld imaging probe can comprise a first imaging module and an OCT imaging module. The first imaging module can have a first illumination path and a separated first imaging path. The first imaging module can comprise an optical window configured to be in contact with a sample. The OCT imaging module can comprise a scanning MEMS mirror and a beam splitting dichroic mirror. The OCT imaging system can comprise at least one polarization maintaining fiber to reduce motion effect to stabilize and increase the OCT image quality. The handheld imaging probe can further comprise one or more lenses achromatized for optical dispersion for the light beams within a wavelength range of an OCT light source and for a field of view of the OCT imaging module.

The invention discloses a color holographic display system based on diffraction distance control and a method of the color holographic display system based on the diffraction distance control. The problem that color crosstalk exists in existing color holographic display is mainly solved. The system comprises a coherent light source array, an expanded beam collimating array, a control unit, a space light modulator array, a diffraction distance control unit and an achromatic lens. The implementation steps of the method comprise the first step of generating monochrome computing holograms, the second step of loading the holograms, the third step of reproducing the holograms and the fourth step of generating a color reproduction image. An optimal Fresnel diffraction distance obtained under different wave lengths in a calculating mode is utilized to generate the three monochrome computing holograms, and Fresnel diffraction with an optimal diffraction distance is respectively carried out on the three monochrome computing holograms. The color holographic display system and the method have the advantages that the hologram loading mode is flexible, light paths are simple and convenient to adjust, and the effect of eliminating the color crosstalk is good.

A wideband, e.g., 550 nm to 940 nm, apochromatic lens system for use with an external aperture stop, includes first, second, and third optical groups having, in order, positive, negative, and positive powers. The first group includes four optical elements having, in order, negative, positive, negative, and positive powers. The second group includes one element of negative power; and the third group includes two elements each having positive power. In another embodiment for use with an internal stop, the system includes first, second, and third optical groups having, in order, positive, positive, and negative powers. The first group includes four optical elements having, in order, positive, negative, positive, and negative powers. The second group includes one element of positive power, and the third group includes one element of negative power. In either embodiment, all of the optical elements are formed from not more than three different types of glass material.

An improved illuminator with an adjustable beam pattern to be worn by medical and dental professionals includes a housing, a light-emitting diode (LED) disposed in the housing outputting light through a distal opening in the housing, an achromatic doublet lens mounted in the opening in the housing, and a singlet lens disposed between the LED and the achromatic lens. The distance between the singlet lens and the doublet lens may be adjustable, and / or distance between the LED and the singlet lens may be adjustable, through a threaded connections, for example. In the preferred embodiment, the achromatic doublet lens, the singlet lens, or both the singlet and the doublet lens have a planar surface. A conical mirror may be disposed between the LED and the singlet lens to increase the light collection efficiency of the LED.

A microscope objective lens OL comprises, in order from the object side: a first lens group G1 having a positive refractive power, a second lens group G2, and a third lens group G3 having a negative refractive power, wherein the first lens group G1 includes a positive lens component L1 having a lens surface with a negative refractive power and at least one cemented lens component CL11 having a positive refractive power, the second lens group G2 includes a diffractive optical element GD that joins two diffractive element components L6 and L7 respectively made from different optical materials and which has a diffractive optical surface D on which diffractive grating grooves are formed on the bonded surface of the two diffractive element components, and at least one cemented lens component CL21, and the third lens group G3 includes at least one achromatic lens component CL31 and a lens surface of the third lens group G3 nearest to the image side is arranged so that a concave surface of the lens surface faces the image side.

The present invention is intended, as an object thereof, to improve stability against both temperature changes and light source output changes, and includes an achromatic lens having a composite structure of glass or a plastic lens having a diffraction grating counteracting a focal length change due to a wavelength change of light, where a lens holder is adhered to an opposite side to a light source of an overhang of the achromatic lens made of glass while the lens holder is adhered to a light source side of the overhang of the plastic lens with the diffraction grating.

The invention belongs to the field of optical detection, and discloses a laser receiving optical axis and visible light optical axis parallelism adjustment system and an adjustment method. According to the adjustment system, a visible light and laser dual-band achromatic lens and a dual-channel visualization image are adopted for judging and adjusting the optical axis parallelism. The method comprises the following steps: aligning a visible light optical axis to the center of a reflection-type collimator reticle, transmitting illuminating light beams by adopting a spotlight, enabling the light beams to enter a laser receiving channel, generating an image at an image side of the achromatic lens after the light beams sequentially pass through a collimator and the achromatic lens, transmitting the image to a displayer, observing the image, reading an error of the optical axis parallelism by utilizing the lattice value of the reticle, rotating a receiving optical wedge in front of the laser receiving passage, and collimating the parallelism of the optical axis. By adopting the laser receiving optical axis and visible light optical axis parallelism adjustment system and adjustment method, the parallelism of the laser receiving axis and the visible light optical axis can be effectively adjusted, characteristics such as intuitiveness and visualization can be achieved, and the precision and efficiency for adjusting the optical axis parallelism also can be improved.

The invention discloses an image display apparatus. The image display apparatus comprises a display screen, and an ocular-side double-convex lens, a reflection element and a first achromatic lens which are disposed on an image light transmission optical path of the display screen, wherein the first achromatic lens is coaxially arranged with the ocular-side double-convex lens and is disposed at the light- emitting side of the ocular-side double-convex lens, an optical axis of the display screen and an optical axis of the ocular-side double-convex lens form a preset included angle, the reflection element is disposed between the display screen and the ocular-side double-convex lens, and image light is reflected on the reflection element, sequentially penetrates the ocular-side double-convex lens and the first achromatic lens, and then reaches a watching side so as to form a virtual image. The invention further discloses a head-mounted display device. According to the formed optical system, the system space volume can be reduced, compressed and amplified, a series of image errors such as coma, astigmation, aberration and the like can be improved, the magnitude of distortion is controlled, and under the condition that viewers can see amplified virtual images with excellent image quality, the requirements of a conventional head-mounted display device for miniaturization and light-weight design are satisfied.

An optical lens comprises: a first lens having a negative focal power; a second lens; a third lens; a fourth lens; a fifth lens, wherein the fourth lens and the fifth lens forms an achromatic lens group; and a sixth lens, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are sequentially disposed along a direction from an object side to an image side, wherein the first lens has at least one object surface facing the object side, and the object surface of the first lens is convex, and wherein the second lens has at least one image surface facing the image side, and the image surface of the second lens is convex so as to facilitate forming a concentric circle structure.

The invention discloses a laser multi-beam combining device. The laser multi-beam combining device comprises a first laser, at least one second laser and dichroscopes, wherein the number of the dichroscopes is matched with the number of the second lasers. The first laser is arranged on transmission light paths of all the dichroscopes, each second laser is arranged on a reflected light path of one dichroscope corresponding to the second laser, and light rays emitted out from the first laser and the second lasers are transmitted and reflected by the dichroscopes respectively and then coincide to form an output light path. The output light path is sequentially provided with an achromatic lens, a pinhole diaphragm, a beam combining mirror and a collimator. By means of the laser multi-beam combining device, light rays with two or more wave lengths are combined in a high precision mode, spatial filtering is achieved, beam quality is improved, meanwhile, the implementation size is small, and performance is stable.

Provided is a grating offset monitoring and adjusting device in a vacuum compression chamber of a high-power pw system. A light beam passes a light splitting prism and is then input to a far-field detection system for calibration, and the light splitting prism is rotated after calibration. The light beam passes a single-pass double parallel grating pair compressor structure in certain incident angle; a semi-reflection semi-transmission lens between the two grating pairs is used for beam splitting; a reflected light beam returns along an original path, and is input to an autocorrelation instrument and the far-field detection system which is composed of a Fabry-Perot interferometer, an achromatic lens, a microscopic object lens and a CCD; a transmitted light beam passes one grating pair, and is then input to the autocorrelation instrument and the far-field detection system; and each grating is controlled by a stepping motor to rotate along the 3D angular direction. The grating offset monitoring adjusting device and method are characterized in that 1) the structure is simple; 2) offset of the four gratings at any dimensional angle is allowed; 3) a monitoring optical path is separated from a main optical path; 4) adjustment steps are automatic and 5) the precision is high.

The invention discloses a dual-mode digital holographic microscope. The dual-mode digital holographic microscope comprises a light source, a beam expansion collimation system, a first cubic beam splitter, a first baffle board, a first plane reflector, a first microscope objective lens, a second cubic beam splitter, a second microscope objective lens, a second plane reflector, a second baffle board, a third plane reflector, an achromatic lens, a third cubic beam splitter and an imaging device. A light beam emitted by the light source passes through the beam expansion collimation system and is then divided into transmission and reflection beams by the first cubic beam splitter. Through controlling the first baffle board and the second baffle board, the light beam propagation path is controlled, and switching between reflective and transmissive measurement modes can be realized. The dual-mode digital holographic microscope is advantaged in that the dual-mode digital holographic microscopecan be used not only for three-dimensional microscopic imaging of transparent samples, but also for three-dimensional microscopic imaging of reflective sample surfaces, convenient test and the compact structure are realized, and the dual-mode digital holographic microscope can be more widely applied to the practical engineering measurement field.

The invention provides an optical imaging lens. The optical lens comprises first, second, third, fourth and fifth lens bodies, wherein the focal power of the first lens body is negative; the focal power of the second lens body is positive; the third and fourth lens bodies form an achromatic lens group; and the focal power of the fifth lens body is positive, and the fifth lens body includes at least one aspheric surface.

The invention relates to a second harmonic microscopic imaging system based on Bessel beam pulse shaping. A femtosecond pulse laser transmits femtosecond pulse lasers with energy in Gaussian distribution to a space light isolator by virtue of a half wave plate and a Glan prism sequentially, lights emergent from the space light isolator are transmitted to a first adjustable diaphragm, lights emergent from the first adjustable diaphragm are transmitted to a cone lens to be converted into Bessel lights, the Bessel lights emergent from the cone lens are transmitted to a second adjustable diaphragm, lights emergent from the second adjustable diaphragm are transmitted to a third adjustable diaphragm by virtue of a achromatic lens assembly, lights emergent from the third adjustable diaphragm arescanned and transmitted to a telecentric conjugated system by virtue of a scanning galvanometer assembly, lights emergent from the telecentric conjugated system are transmitted to another half wave plate, light emergent from another half wave plate are transmitted to a dichroscope by virtue of the telecentric conjugated system, lights emergent from the dichroscope are focused on a sample on an objective table by virtue of a microscope objective, the sample produces a second harmonic signal, and then the second harmonic signal is collected by virtue of the microscope objective and then is acquired by an EMCCD by virtue of the dichroscope and a light filter.

An improved illuminator with an adjustable beam pattern to be worn by medical and dental professionals includes a housing, a light-emitting diode (LED) disposed in the housing outputting light through a distal opening in the housing, an achromatic doublet lens mounted in the opening in the housing, and a singlet lens disposed between the LED and the achromatic lens. The distance between the singlet lens and the doublet lens may be adjustable, and / or distance between the LED and the singlet lens may be adjustable, through a threaded connections, for example. In the preferred embodiment, the achromatic doublet lens, the singlet lens, or both the singlet and the doublet lens have a planar surface. A conical mirror may be disposed between the LED and the singlet lens to increase the light collection efficiency of the LED.

The invention is a ultra-fast pulse X ray phase contrast imaging device, it includes a femtosecond laser system, splitter, optical delaying line, all-mirror and target chamber, in which there arranges a achromatic lens, sample chamber, fixed target and concave reflecting mirror, there has a detector out of the target chamber. The position relation of above mentioned elements is: a splitter is arranged on the output light path of femtosecond titanium stone laser system, the splitter divides the laser bema into A, and B, the A beam enters the target chamber through optical delay, and it is gathered to radiate the gas in the sample chamber with achromatic lends, the B enters the target chamber through all-mirror, reflected by the reflecting mirror and gathered onto the target, generates a X ray, the X ray enters the sample chamber, the state of the plasma in the sample chamber is recorded by the detector, the distance between the detector and the gas chamber agrees the imaging condition.

In a zoom lens comprising first to fourth lens groups, the second lens group comprises two meniscus lenses and an achromatic lens. The achromatic lens comprises a cemented lens having a negative refracting power as a whole, and a lens having a positive refracting power with a convex surface directed onto the object side. The cemented lens comprises a meniscus lens or plane-convex lens having a positive refracting power with a convex surface or plane directed onto the object side, and a lens having a negative refracting power.

The invention discloses a reverse spatial deflection Raman spectrum detection device. The device is characterized by comprising a laser device, laser device coupling optical fiber, a collimator, a bypass filter lens, an telescopic sleeve, a conical lens, a dichroscope, a double-glued achromatic lens pair, a long-wave filtering lens, a trapped-wave filtering lens, a spectrum collection optical fiber, a back-illuminated in-depth refrigerating electron-multiplying CCD camera, a spectrograph and a computer. The invention further provides a reverse spatial deflection Raman spectrum detection method. Compared with the prior art, the device has the advantages that the conical lens is used to form an annular light spot to irradiate a to-be-detected sample, and Raman signals are collected at the circle center of a ring and then transmitted to the spectrograph for spectrum analysis to realize noncontact detection of the to-be-detected sample to generate in-depth ingredient Raman spectrum information.

In a zoom lens comprising first to fourth lens groups, the second lens group comprises two meniscus lenses and an achromatic lens. The achromatic lens comprises a cemented lens having a negative refracting power as a whole, and a lens having a positive refracting power with a convex surface directed onto the object side. The cemented lens comprises a meniscus lens or plane-convex lens having a positive refracting power with a concave surface or plane directed onto the object side, and a lens having a negative refracting power.

An optical system of a stereo video endoscope with lateral viewing direction. The optical system including: a sideways looking distal optical assembly; and a proximal optical assembly. Where the distal optical assembly includes, successively in a direction of light incidence on a common optical axis: an entrance lens configured as a raised negative meniscus, an optical deflection unit; and an exit lens configured as a hollow positive meniscus, Where the distal optical assembly has, at least in sections, a right and a left lens system channel of identical type and arranged parallel to one another, each of the right and left lens system channel having: a dedicated optical axis, and at least one first lens and an achromatic lens group in the direction of light incidence.

The invention belongs to the technical field of optical measurement, and particularly relates to an optical surface interval non-contact type measuring device and method. The swept source optical coherence tomography (SSOCT) principle is used for carrying out optical interval non-contact measurement, and the single measurement depth can reach tens of millimeters, a plurality of optical surfaces ofmost optical systems can be simultaneously measured through one-time detection, a reference arm moves for segmented measurement to achieve a wide range, and the measurement precision completely depends on the axial resolution of the systems. The device and method further optimize a measuring light path, a focusing module is additionally arranged on a focus-adjustable measuring arm, and a proper focusing light path is selected according to sample parameters, reflection light signals of all the optical surfaces can be well collected, and the intensity of interference signals is improved; an achromatic lens is additionally arranged in the movable reference arm, the focusing module of the focus-adjustable measuring arm and a lens set of the movable reference arm are both achromatic lenses, and the measuring precision is further improved.

The invention discloses a broad spectrum optical fiber collimator. The broad spectrum optical fiber collimator comprises a thermal-expanding core optical fiber head, an achromatic lens and an outer sleeve, wherein the thermal-expanding core optical fiber head and the achromatic lens are arranged in the outer sleeve in a straight line, and an air layer is arranged between the thermal-expanding core optical fiber head and the achromatic lens, the thermal-expanding core optical fiber head and the achromatic lens have the same optical axis, and the outer sleeve is provided with a fixed central axis; the broad spectrum optical fiber collimator has the characteristics that a rear end face of the achromatic lens is vertical to the outer sleeve, the distance between the rear end face of the achromatic lens and a front end face of the thermal-expanding core optical fiber head is the thickness of the air layer in the middle, and is equal to the difference of an effective focus length of the achromatic lens and the distance between the rear end face of the achromatic lens and a primary side of the achromatic lens. Compared with the traditional collimator, the broad spectrum optical fiber collimator provided by the invention greatly reduces the insertion loss of an incident light beam; the core diameter of the thermal-expanding core optical fiber head is magnified by 3-5 times; an emergent light beam has a large spot diameter, and a small emergent aperture angle; and the chromatic dispersion caused by the broad spectrum is eliminated, the system transmission performance is improved, and the alignment error is low.