123 results about "Non linear optical materials" patented technology

An active gain region sandwiched between a 100% reflective bottom Bragg mirror and an intermediate partially reflecting Bragg mirror is formed on a lower surface of a supporting substrate, to thereby provide the first (“active”) resonator cavity of a high power coupled cavity surface emitting laser device. The reflectivity of the intermediate mirror is kept low enough so that laser oscillation within the active gain region will not occur. The substrate is entirely outside the active cavity but is contained within a second (“passive”) resonator cavity defined by the intermediate mirror and a partially reflecting output mirror, where it is subjected to only a fraction of the light intensity that is circulating in the gain region. In one embodiment, non-linear optical material inside each passive cavity of an array converts an IR fundamental wavelength of each laser device to a corresponding visible harmonic wavelength, and the external output cavity mirror comprises a Volume Bragg grating (VBG) or other similar optical component that is substantially reflective at the fundamental frequency and substantially transmissive at the harmonic frequency. The VBG used in an array of such devices may be either flat, which simplifies registration and alignment during manufacture, or may be configured to narrow the IR spectrum fed back into the active resonant cavity and to shape the spatial mode distribution inside the cavity, thereby reducing the size of the mode and compensating for any deformations in the semiconductor array.

The present invention provides pulsed lasers which employ carbon nanotubes, particularly layers of carbon nanotubes, as saturable absorbers, mode lockers or for Q-switching elements. The present invention also provides methods and materials for mode-locking and Q-switching of lasers in which carbon nanotubes are employed as non-linear optical materials and / or saturable absorbers which facilitate mode-locking and / or Q-switching. The invention further provides mode locker and Q-switching elements or devices which comprise one or more layers containing carbon nanotubes which layer or layers function for mode locking and / or Q-switching.

The present invention discloses process of preparing nanometer TTF-TCNQ material. The process includes the following steps: 1. dispersing and dissolving TTF in normal hexane to form normal hexane solution of TTF; 2. dispersing and dissolving TCNQ in acetonitrile to obtain acetonitrile solution of TCNQ; and 3. adding the acetonitrile solution of TCNQ into normal hexane solution of TTF while stirring to obtain nanometer TTF-TCNQ material. The present invention synthesizes 1D nanometer TTF-TCNQ material as organic conductor, realizes the controllable growth of nanometer particle, and can obtain nanometer material with different controllable forms and structures. The preparation process is simple and high in yield, and the prepared nanometer material may be applied widely in sensor, field emission plane display, field effect device, non-linear optical material, piezoelectric material and other fields.

An attenuated phase shift mask is formed using a non-linear optical material for both fiducial features and pattern features. The non-linear optical material selected has predetermined transmission at the actinic exposure wavelength and a smaller transmission at the fiducial recognition wavelengths.

The invention discloses a non-linear optical material, namely a lead bismuth phosphate crystal, and relates to the field of non-linear optical materials. A chemical formula of lead bismuth phosphate is Pb3Bi (PO4)3; the molecular weight is 2230.98; the lead bismuth phosphate belongs to a cubic crystal system; the space group is I43d; and single-cell parameters, namely alpha, beta and gamma are 90.00 degrees, and Z is equal to 2. The lead bismuth phosphate crystal is prepared by adopting a high-temperature solid-state method. The lead bismuth phosphate has excellent non-linear optical performance; a powder secondary harmonic generation (SHG) coefficient of the lead bismuth phosphate is three times that of potassium dihydrogen phosphate (KDP); and the lead bismuth phosphate crystal can be used for deep water communication of submarines, laser blinding weapons, marine fish detection, optical disk recording, color laser printing, laser projection televisions, and optical computing or optical fiber communication.

The invention relates to color-changing polyurethane acrylic dyestuff resin and a preparation method. According to the color-changing polyurethane acrylic dyestuff resin, a double-bond-containing polyurethane dyestuff prepolymer is prepared from macromolecular polyol, polybasic isocyanate, a dyestuff and a hydroxyl acrylate monomer through step-by-step polymerization; then an initiator and an acrylate monomer are added and are subjected to solution polymerization to prepare the color-changing polyurethane acrylic dyestuff resin. The color-changing dyestuff is very stable and has a bright color; the obtained polyurethane acrylic dyestuff resin has an obvious photochromic property; the defects in the aspect of application of a small molecular azo dyestuff and limitation to an application field are overcome; the dyestuff is joined in a polymer molecular chain through a chemical bonding manner and the advantages of the dyestuff of friction resistance, migration resistance, staining resistance, gloss retention, safety in utilization and the like are obviously improved. The synthesized polyurethane acrylic dyestuff resin has excellent performance of polyurethane and acrylate. The color-changing polyurethane acrylic dyestuff resin has excellent thermal stability and processing performance, and has a wide application prospect in the fields of advanced materials including information storage and protection materials, liquid crystal displays, non-linear optical materials and the like.