52results about How to "Improve spot quality" patented technology

A thermionic emission device, in particular for use in an x-ray tube, has an indirectly heated primary emitter that is fashioned as a flat emitter with an unstructured primary emission surface, and a heating emitter that is fashioned as a flat emitter with a structured heat emission surface. The primary emitter and the heating emitter each has at least two terminal lugs, and the primary emission surface and the heat emission surface are aligned essentially parallel to one another. The emission device provides an optimally high quality of the focal spot with a simple design and, given high thermal load, an unwanted widening or defocusing of the electron beam is avoided by the terminal lugs of the primary emitter being aligned essentially perpendicular to the primary emission surface and not protruding beyond the primary emission surface in the lateral direction.

The invention relates to the field of illumination of LED (light emitting diode) light sources, in particular to a novel secondary light distribution lens and novel secondary light distribution equipment for a discrete LED light source. An incident surface of the lens comprises an incident side surface and an incident end surface; the incident end surface is a composite surface which comprises a main incident end surface and secondary incident end surfaces; the secondary incident end surfaces are arranged on the main incident end surface; the secondary incident end surfaces and the main incident end surface are curved surfaces; the secondary incident end surfaces are projected towards the bottom of the lens; the lens is suitable for the discrete LED light source; the secondary incident end surfaces correspond to various secondary light sources in the light source; off-axis light rays which are emitted from the secondary light sources in an off-axis state relative to the axis in the lens are converted into on-axis light rays or paraxial light rays of secondary incident end surfaces by the secondary incident end surfaces, so that the light intensity of small-angle light rays can be improved effectively; secondary small-projection lens arrays which have a dodging effect are densely distributed on the incident end surface; and an illumination light field of which the discrete LED light source is modulated by the lens has a perfect effect.

The invention discloses a fully polarization-maintaining fiber laser lattice generation device for stimulated emission loss microscope, which includes a half-wave plate, a coupling objective lens, a polarization-maintaining fiber coupler, and an optical fiber fixed sequentially arranged along the propagation direction of the excitation light. device, beam reducer and high numerical aperture objective lens; multiple polarization-maintaining optical fibers at the exit end of the polarization-maintaining fiber coupler are each provided with a polarization controller; the ends of the multiple polarization-maintaining optical fibers at the exit end of the polarization-maintaining fiber coupler pass through Fiber Fixtures. The device of the present invention has the advantages of simple and compact structure, convenient adjustment, stable operation, and relatively low loss. It can provide a large-scale grid for STED microscopes with large coverage area, spot spacing about half the wavelength of the incident light, and consistent laser spot shape. De-excite the laser lattice.