14 results about "Optical transition" patented technology

The invention provides a 60KW high-power single-mode semiconductor laser. The 60KW high-power single-mode semiconductor laser comprises an N aluminum electrode shell, a GaN substrate is arranged at the bottom of the inner side wall of the N aluminum electrode shell, an n-ALGaN layer is arranged on the upper surface of the GaN substrate, a first GaN layer is arranged on the upper surface of the n-ALGaN layer, an INGANactive layer is arranged on the upper surface of the first GaN layer, and a second GaN layer is arranged on the upper surface of the INGANactive layer. The GaN substrate and the SiN layer are used as the substrate of the laser to improve the light transition probability, then the n-ALGaN layer and the p-ALGaN layer are used as the epitaxial layers of the laser to improve the voltage resistance of the laser, and then the first GaN layer, the INGANactive layer and the second GaN layer are used to improve the limiting capability of the laser to holes and electrons, so that the performance of the laser is improved. The light wave generated by compounding can be effectively limited, the radiation efficiency is greatly improved, better ohmic contact can be formed between the p-GaN layer and the P aluminum electrode, the ohmic contact resistance and the power consumption of the laser are reduced, and the photoelectric conversion rate of the laser can reach 80%.

Optical frequency reference apparatus (10) comprising - an atomic vapor cell (1), containing a vapor of reference atoms, said atomic vapor cell (1) comprising a first end (41) having a first window (4) and a second end (61), - a laser source (11) for generating a laser probe beam (3) adapted to excite a two-photon optical transition of said reference atoms, - an optical detector (14), adapted to detect a fluorescence signal emitted by said reference atoms, and - at least one reflective element (5, 15) wherein the laser source (11), the atomic vapor cell (1) and the at least one reflective element (5, 15) are configured such that, in operation, the probe beam (3) enters the atomic vapor cell (1) through said first window (4) at said first end (41) and crosses said vapor of reference atoms until said second end (61) through a defined optical path in a first forward direction (3a), the probe beam (3) is reflected backwards by said at least one reflective element (5, 15) and crosses said vapor of reference atoms a second time through the same defined optical path, in a second direction (3b) opposite to the first forward direction (3a), characterized in that the optical frequency reference apparatus (10) further comprises means (7, 9) for absorbing the reflected laser probe beam (3) exiting from the atomic vapor cell (1) according to the second direction (3b).

A system (30) for controlling, regulating or authenticating a timer comprises means (31) for measuring the frequency signal and / or rate of one or more timers based on a time reference provided by an optical atomic clock (10) comprising an atomic vapor chamber (1), the atomic vapor chamber (1) comprises a hermetically sealed enclosure (8) defining a volume containing a vapor of a reference atom (2), the hermetically sealed enclosure (8) comprising an optical inlet (3) allowing transmission of a probe beam adapted to excite an optical transition of the reference atom (2) and an optical outlet (4) allowing transmission of a fluorescence signal from the reference atom (2), the hermetically sealed housing (8) further comprises a wall (5) through which the fluorescent signal can penetrate, said wall (5) being coated on its outer side with a coating (6) which is reflective to the fluorescent signal.

Aspects of this disclosure concern controllers and control methods for applying a drive voltage to bus bars of optically switchable devices such as electrochromic devices. Such devices are often provided on windows such as architectural glass. In certain embodiments, the applied drive voltage is controlled in a manner that efficiently drives an optical transition over the entire surface of the electrochromic device. The drive voltage is controlled to account for differences in effective voltage experienced in regions between the bus bars and regions proximate the bus bars. Regions near the bus bars experience the highest effective voltage. In some cases, feedback may be used to monitor an optical transition. In these or other cases, a group of optically switchable devices may transition together over a particular duration to achieve approximately uniform tint states over time during the transition.

A rare-earth-doped antiferromagnetic crystal is disclosed, designed to achieve long optical coherence times and enable coherent coupling between optical and magnon modes. The crystal includes a host lattice, such as gadolinium vanadate, gadolinium oxide, or gadolinium silicate, which is antiferromagnetic below a Néel temperature and is doped with a second rare-earth ion, such as erbium. By operating at cryogenic temperatures, electron spins in the host are magnetically ordered, providing a quiet magnetic environment that minimizes decoherence for the dopant ions. The system achieves long optical coherence times for the rare-earth dopant ions, supporting robust quantum memory and communication. Additionally, coherent coupling between the optical transitions of the dopant and magnon modes of the host enables efficient microwave-to-optical quantum transduction. Isotopic purification of the host and / or dopant ions can further reduce nuclear spin noise, enhancing coherence times.

What is needed is an optical scheme that provides high collection efficiency while reducing the effects of the vapor cell heating the temperature-sensitive photodetector.SOLUTION: The system for controlling, adjusting or certifying the timepiece includes a means for measuring a frequency signal and / or a rate of the timepiece or several timepieces based on a time reference provided by an optical electronic timepiece 10. Wherein the optical electronic watch comprises an atomic vapor cell 1, the atomic vapor cell comprising a sealed enclosure defining a volume containing a reference atomic vapor, the sealed enclosure comprising an optical inlet 3 allowing transmission of a probe beam adapted to excite an optical transition of the reference atoms and an optical outlet 4 allowing transmission of a fluorescence signal from the reference atoms, the sealed enclosure further comprising a wall 5 transparent to the fluorescence signal and coated on its outside with a coating reflecting the fluorescence signal.SELECTED DRAWING: Figure 5

The application relates to a myopia prevention and control optical lens based on zoning modulation and edge fusion, and belongs to the technical field of optical lenses. An optical function zone is sequentially provided with a central optical zone, an annular defocus zone and a point-shaped nano lithography point zone from the center of the lens outward, the central optical zone accurately corresponds to the macular fovea region of the retina, the annular defocus zone is arranged with concentric annular defocus microstructure units, and the point-shaped nano lithography point zone is arranged at the periphery of the annular defocus zone and the gap between the annular zones, and serves as an optical buffer zone to soften the optical transition edge.

The utility model discloses a point diffusion prism lens composite lens, which relates to the technical field of myopic glasses, and comprises a point diffusion lens and a second lens arranged on the inner side or the outer side of the point diffusion lens, and the second lens is selected from one of a combined prism lens, a progressive lens or a defocus lens. The combined prism lens is formed by combining a prism and a convex lens, and the convex lens is located between the prism and the point diffusion lens. The combined prism lens is wedge-shaped, the thicker end of the combined prism lens is a base, and the thinner end of the combined prism lens is a base top. According to the point diffusion prism lens composite lens, the point diffusion lens is respectively compounded with the combined prism lens, the progressive lens or the out-of-focus lens, so that incident light is scattered, soft optical transition is formed in a peripheral view field, and the design reduces the signal intensity difference between adjacent view cone cells, namely, reduces the contrast ratio; therefore, 'elongation signals' transmitted from the retina to the eyeball are inhibited, and eye axis growth is slowed down.

The invention relates to a non-equilibrium surface oxygen vacancy induced rapid optical transition material and a preparation method thereof. The non-equilibrium surface oxygen vacancy induced rapid optical transition material has an ATiO3-at-ATiO3-x core-shell structure, the core structure is a complete and ordered ATiO3 crystal lattice, and the shell structure is a disordered ATiO3-x amorphous structure containing non-equilibrium surface oxygen vacancy defects; wherein A is Mg, Ca, Sr or Ba; x is more than 0 and less than 1.5.

Atomic vapor cell (1), comprising a hermetically sealed enclosure (8) defining a volume containing a vapor of reference atoms (2), said hermetically sealed enclosure (8) comprising an optical inlet (3) allowing the transmission of a probe beam adapted to excite an optical transition of said reference atoms (2), and an optical outlet (4) allowing the transmission of a fluorescence signal from said reference atoms (2), characterized in that said hermetically sealed enclosure (8) further comprises a wall (5), transparent to said fluorescence signal, which is coated on its outer side with a coating (6) reflective to said fluorescence signal.

An electro-optic element includes a cathodic compound and an anodic compound. At least one of the cathodic compound and the anodic compound include a homochiral functional group that is in close proximity to a corresponding optical transition dipole of one of the cathodic compound and the anodic compound. The electro-optic medium is configured to reversibly generate a dichroic absorbance in the visible spectrum.

The application relates to a method for measuring the electron spin lifetime of semiconductor colloidal nanomaterials based on a photochemical charge doping method. As a light absorber, the semiconductor colloidal nanomaterials are excited under ultraviolet light to generate excited state electrons and holes on a conduction band and a valence band respectively. A strong reducing agent lithium triethylborohydride (LiEt3BH) is used as an electron dopant to capture the photo-generated holes on the valence band of the semiconductor colloidal nanomaterials, and the electrons on the semiconductor conduction band cannot return to the ground state, thereby loading negative charges, that is, the photochemical doping of the electrons is completed. On this basis, the electron spin relaxation lifetime is measured based on the semiconductor carrier optical transition selection rule and the circular polarization transient absorption spectrum (TA) technology. The method for measuring the electron and hole spin lifetimes in the semiconductor based on the charge doping method is a direct way to accurately obtain the carrier spin lifetime, and lays an important foundation for developing and utilizing the charge spin properties of semiconductor materials.

System (30) for the control, adjustment or certification of timepieces comprising means (31) to measure the frequency signal and / or the rate of a timepiece or of several timepieces, based on a time reference provided by an optical atomic clock (20), said optical atomic clock (20) comprising an optical frequency reference apparatus (10) which comprises : - an atomic vapor cell (1), containing a vapor of reference atoms, said atomic vapor cell (1) comprising a first end (41) having a first window (4) and a second end (61), - a laser source (11) for generating a laser probe beam (3) adapted to excite a two- photon optical transition of said reference atoms, - an optical detector (14), adapted to detect a fluorescence signal emitted by said reference atoms, and - at least one reflective element (5, 15) wherein the laser source (11), the atomic vapor cell (1) and the at least one reflective element (5, 15) are configured such that, in operation, the probe beam (3) enters the atomic vapor cell (1) through said first window (4) at said first end (41) and crosses said vapor of reference atoms until said second end (61) through a defined optical path in a first forward direction (3a), the probe beam (3) is reflected backwards by said at least one reflective element (5, 15) and crosses said vapor of reference atoms a second time through the same defined optical path, in a second direction (3b) opposite to the first forward direction (3a), characterized in that the optical frequency reference apparatus (10) further comprises means (7, 9) for absorbing the reflected laser probe beam (3) exiting from the atomic vapor cell (1) according to the second direction (3b).

Temperature measurements are critical in gas turbine engine design but difficult to obtain due to the extreme environment. Temperature indicating paints (thermal paints) have been used for decades to map maximum temperature fields on superalloy components but have numerous weaknesses. Disclosed herein are novel glass ceramic thermal paints that undergo viscous flow sintering to indicate temperatures up to 1000° C., with high resolution (±5° C.), by an optical transition. Disclosed paint formulations are designed to adhere to Nickel-based superalloys or SiC—SiC ceramic matrix composites (CMC) by closely matching coefficients of thermal expansion and may function for times above 60 hours. By utilizing automation and a UV:VIS spectrometer, quantitative temperature maps can be generated for easy comparison to theoretical models. A transient sintering energy model is disclosed to recover full thermal history information.