Principia Lightworks, Inc.

Vladimir I Kozlovsky

Michael D Tiberi

An electron beam pumped laser including a surface-emitting laser faceplate oriented at a non-perpendicular angle. Embodiments are described in which a bending coil bends the electron beam, or in which the faceplate is situated in the direct path of the e-beam emission but with a non-zero orientation angle. The faceplate may include a substantially opaque substrate, and an opaque heat-removing structure may be attached to the substrate to provide high heat transfer, thereby allowing high electron-beam pumping intensity and providing more light emission from a smaller package. In some embodiments the partially reflective mirror comprises a metal layer that has a plurality of openings. Multiple laser faceplates (e.g., red, green, and blue) may be placed in the same tube, to provide a continuous light source for projection television. The substrate may be connected to ground to provide an exit path for electrons from the laser gain layer.

Electron beam pumped laser light source for projection television

A laser having a laser cavity is disclosed that does not require conventional dielectric mirrors or as-grown reflectors. Instead, a diffraction grating and total internal reflection system is used to define a laser cavity. Within the laser cavity, the laser emission travels in a zigzag pattern. The diffraction grating provides a highly reflective 'mirror' diffracting beams at a forward angle and back angle that 'tunes' the process of total internal reflection. The diffraction grating also directs a small percentage of the incident radiation approximately normal to the upper face of the semiconductor (more generally, at an angle less than the critical angle), to provide an output laser beam. The laser can be used in an electron tube and laser display system.

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Troitsk, Russia

Vladimir I Kozlovsky