32 results about "Single photon absorption" patented technology

A laser scanning microscope produces molecular excitation in a target material by simultaneous absorption of three or more photons to thereby provide intrinsic three-dimensional resolution. Fluorophores having single photon absorption in the short (ultraviolet or visible) wavelength range are excited by a beam of strongly focused subpicosecond pulses of laser light of relatively long (red or infrared) wavelength range. The fluorophores absorb at about one third, one fourth or even smaller fraction of the laser wavelength to produce fluorescent images of living cells and other microscopic objects. The fluorescent emission from the fluorophores increases cubicly, quarticly or even higher power law with the excitation intensity so that by focusing the laser light, fluorescence as well as photobleaching are confined to the vicinity of the focal plane. This feature provides depth of field resolution comparable to that produced by confocal laser scanning microscopes, and in addition reduces photobleaching and phototoxicity. Scanning of the laser beam by a laser scanning microscope, allows construction of images by collecting multi-photon excited fluorescence from each point in the scanned object while still satisfying the requirement for very high excitation intensity obtained by focusing the laser beam and by pulse time compressing the beam. The focused pulses also provide three-dimensional spatially resolved photochemistry which is particularly useful in photolytic release of caged effector molecules, marking a recording medium or in laser ablation or microsurgery. This invention refers explicitly to extensions of two-photon excitation where more than two photons are absorbed per excitation in this nonlinear microscopy.

A method is described for laser scribing or dicing portions of a workpiece using multi-source laser systems. In one embodiment, a first laser uses multiphoton absorption to lower the ablation threshold of portions of the workpiece prior to a second laser ablating the portions of the workpiece. In an alternative embodiment, a first laser uses high energy single-photon absorption to lower the ablation threshold of portions of the workpiece prior to a second laser ablating the portions of the workpiece.

An apparatus and method for making a three-dimensional object from a solidifiable material using two photon absorption is described. The use of two photon absorption allows for the creation of a non-solidification zone beneath the exposed surface of a solidifiable material so that no separation is required between the most recently solidified layer of the object and a substrate such as a glass, a film, or a glass/film combination. In addition, when used with a linear scanning device, two photon absorption causes solidification to occur within a small spot area, which provides a means for creating larger, higher resolution objects than DLP systems or laser systems that use single photon absorption.

The present invention provides methods and apparatuses for writing information to, reading information from, and erasing information on a luminescent data storage medium comprising Al₂O₃. The method includes writing and erasing of the information using photoionization via sequential two-photon absorption and non-destructive reading the information using one-photon absorption and confocal fluorescent detection. The apparatuses for writing and reading the information incorporate confocal detection and spherical aberration correction for multilayer volumetric fluorescent data storage. The methods also allow multilevel recording and readout of information for increased storage capacity.

An all-optical XOR logic gate. In one embodiment, a single photon absorption medium is used to provide enhanced optical response of a gate to an applied optical signal. The apparatus described uses at least two gate inputs and an optical modulation structure such as a Mach-Zehnder interferometer to perform logical XOR operations on an optical input signal using the gate inputs. The result of the XOR operation is provided as information in an optical output signal representative of the result of the XOR operation impressed on the optical input signal.

An optical information recording medium includes: a recording layer 12 comprising a multi-photon absorption compound and a one-photon absorption compound; and a supporting member (base layer 11) configured to support the recording layer 12. In this optical information recording medium, absorption of multiple photons by the multi-photon absorption compound and absorption of one photon by the one-photon absorption compound cause a void to be generated in the recording layer, whereby information is recordable by modulation based on a presence or absence of a void.

The invention discloses a carbon nanodot with a thermal activation near-infrared up-conversion luminescence characteristic as well as a preparation method and application of the same, and belongs to the technical field of carbon nanomaterials. The carbon nanodots are prepared by stripping red light emitting carbon nanodots and are formed by stacking a single layer or a small amount of graphene-like lamellas, and main absorption and emission peaks of the carbon nanodots are located in a near-infrared region. The up-conversion luminescence of the carbon nanodots originates from thermal activation single photon absorption and can be achieved under the excitation of a continuous laser light source; up-conversion emission peak positions are subjected to blue shift along with temperature rise, and peak intensity is enhanced; as the temperature decreases, the up-conversion emission gradually disappears while the down-conversion luminescence is enhanced. The near-infrared luminescence up-conversion carbon nanodot can be used as a near-infrared imaging reagent to be applied to variable-temperature up-conversion fluorescence imaging and in-vivo up-conversion fluorescence imaging.

A single-photon absorption all-optical signal-processing device, systems employing the same, and methods of making and using the same. Illustrative examples are provided based on silicon semiconductor technology that employs rectangular waveguides fabricated on SOI wafers. In some embodiments, it is observed that the waveguides have surface state density, σ, of not less than 1.5×10¹⁸ cm⁻¹s⁻¹mW⁻¹ to provide a single-photon absorption operation mode. In some embodiments, some portion of the ridge waveguide structure has a surface to volume ratio of at least 18 μm⁻¹, computed using a unit length of 1 μm of the waveguide, with the width and depth dimensions of the waveguide being measured in units of microns.

A system for single photon absorption based vat photopolymerization additive manufacturing with photoinhibition induced curb and photoexcitation induced cure (SPA2CurbCure), comprising: a build chamber; a two-wavelength projection irradiation unit delivering a patterned photo-curbing exposure mask and a patterned photo-curing exposure mask, respectively, to create a curing legion of initiating chemicals surrounded by a distribution of inhibiting species; wherein a curing light beam comprising light having a first wavelength and a curbing light beam comprising light having a second wavelength from the irradiation unit are manipulated into adjacent complementary exposures, combined by a dichroic beam splitter and collimated into a target resin material in the build chamber.

The invention relates to an application of an azaanthracene derivative as a single-photon weak light up-conversion luminescence agent material. By using the azaanthracene derivative as a luminescent agent material for single-photon absorption up-conversion, red light can be excited at 655nm, a red-to-yellow single-photon absorption up-conversion fluorescent color-changing effect of orange light ofabout 610nm can be obtained, up-conversion color change can be achieved without deoxygenation, and the types of luminescent agent materials in the field of single-photon absorption up-conversion areenriched.

In certain embodiments, a laser device for laser processing of an eye comprises a source of a pulsed laser beam, a detector system that photodetects partial beams generated from the laser beam, and a control unit that evaluates the detection signals. A first detection element of the detector system provides a first detection signal based on single-photon absorption. A second detection element provides a second detection signal based on two-photon absorption. The control unit puts the measured signal strengths of the two detection signals into a ratio to one another. Variations in the resulting ratio value may be traced back to variations in the pulse duration and/or wave front of the laser beam. The control unit may initiate countermeasures to maintain the beam quality of the laser beam.

An optical information recording medium includes at least one recording layer. The recording layer includes a recording material comprising a polymer compound to which a one-photon absorption dye is bonded, and a coupling strength Δ² between the one-photon absorption dye and the polymer compound in the recording material is higher than a coupling strength estimated to be exerted between the same one-photon absorption dye and the same polymer compound if the one-photon absorption dye is dispersed in the polymer compound in the recording material.

The object of the invention is to provide an optical information recording medium which excels in stability e.g., for preserving the properties during a long-term storage and which enables recording using a laser having a small peak power, and a method for manufacturing such an optical information recording medium. An optical information recording medium 10 includes a recording layer 14, and intermediate layers (adhesive agent layer 15A and recording layer support layer 15B) adjacent to the recording layer 14, and the recording layer 14 includes a recording material comprising a one-photon absorption dye bound to a polymer binder (polymer compound).

The invention discloses application of rhodamine sulfur spirolactone in detection of mercury ions by an up-conversion fluorescence analysis method, a sample containing the mercury ions and a rhodamine sulfur spirolactone solution are mixed to obtain a mixed solution, then the mixed solution is irradiated by a 655 nm excitation light source, and when the wavelength range of emitted light is 565-630 nm, it is indicated that the sample contains the mercury ions. The invention discloses a single photon absorption up-conversion (OPA-UC) detection technology which can be used for detecting high-concentration mercury ions (mM of millimole concentration magnitude). The limitation that only low-concentration mercury ions (micromolar concentration magnitude, mu M) can be detected by using a conventional fluorescence (namely Stokes fluorescence) detection technology is overcome. Compared with a conventional fluorescence detection method, the OPA-UC method has the advantage that the concentration detection of mercury ions can be improved by 2 orders of magnitude.

The invention relates to a superconducting optical detector based on silicon-based etching and optical fiber alignment method and device. The first substrate is etched, an optical fiber position through hole is formed, and a plurality of first marks arranged at intervals are prepared on the surface of the first substrate; a relative position relationship is formed between the plurality of first marks and the optical fiber position through hole. When the single-photon absorption film is prepared on the surface of the second substrate, the second substrate is used as a substrate of the superconducting single-photon detector, and the superconducting single-photon detector is prepared by adopting a preparation process of the superconducting single-photon detector. At this time, a relative position relationship is formed between the plurality of second marks and the single-photon absorption film, and is the same as a relative position relationship between the plurality of first marks and the optical fiber position through hole. Furthermore, the plurality of first marks and the plurality of second marks are in one-to-one correspondence, so that the alignment of the optical fiber positionthrough hole and the single-photon absorption film can be achieved. Therefore, the optical fiber is directly placed in the optical fiber position through hole, and alignment with the single-photon absorption film can be achieved.