32 results about "Single photon absorption" patented technology

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.

A single-photon absorption all-optical modulator, systems employing the same, and methods of making and using the same. An illustrative example is provided based on silicon semiconductor technology that employs rectangular waveguides. In some embodiments, it is observed that the waveguides operate with an absorption density of less than 1017 cm−1s−1mW−1 to provide a single-photon absorption operation mode.

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.

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.

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.

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).

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 present application relates to a method and device for aligning a superconducting optical detector and an optical fiber based on silicon-based etching. The first substrate is etched to prepare through holes for optical fiber positions, and a plurality of first marks arranged at intervals are prepared on the surface of the first substrate. A relative positional 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 the substrate of the superconducting single-photon detector, and the preparation process is adopted for preparing the superconducting single-photon detector. At this time, the relative positional relationship between the multiple second marks and the single photon absorption film is the same as the relative positional relationship between the multiple first marks and the optical fiber position through hole. Furthermore, through one-to-one correspondence between the plurality of first marks and the plurality of second marks, the alignment of the position through hole of the optical fiber and the single photon absorption film can be realized. Therefore, the alignment with the single photon absorption film can be achieved by directly placing the optical fiber in the through hole of the optical fiber position.

The invention provides a photochromic diarylethene compound with upconversion luminescence performance and application thereof. The photochromic diarylene compound has the structure shown in formula I. The photochromic diarylethene compound of the present invention is a type of switch-type single-photon absorption up-conversion luminescent material, which can realize up-conversion luminescence with high vibration energy level absorption, and can realize up-conversion luminescence through multiple wavelength light regulation Due to the strong tissue penetration ability of long wavelength, the photochromic diarylethene compound can also effectively eliminate background noise such as autofluorescence, which is expected to be applied in super-resolution single-photon imaging systems.