Abstract: A system for monitoring an energy beam burn through has a sheet formed of a material approximately transparent to optical radiation at a desired operating wavelength. A light detector is attached to the sheet. A coating is applied to the sheet and the light detector, wherein penetration of the coating by a light source allows the light source to scatter within the sheet. A response unit is coupled to the detector unit for signaling an alarm when the light detector senses the light source of a predetermined level.

Abstract: A tomographic optical beam irradiance sensor is disclosed. An optical medium receives an incident beam at a plurality of incident points in the optical medium. A first angular optical sensor assembly senses a first set of ray angles and intensities of a plurality of scatter rays emitted from the incident points. A second angular optical sensor assembly senses a second set of ray angles and intensities of the scatter rays emitted from the incident points. A tomography module determines a plurality of locations and intensities of the incident points in the optical medium based on the first set of ray angles and intensities and the second set of ray angles and intensities.

Abstract: A system for monitoring an energy beam burn through has a sheet formed of a material approximately transparent to optical radiation at a desired operating wavelength. A light detector is attached to the sheet. A coating is applied to the sheet and the light detector, wherein penetration of the coating by a light source allows the light source to scatter within the sheet. A response unit is coupled to the detector unit for signaling an alarm when the light detector senses the light source of a predetermined level.

Abstract: An electronic network filter for classified partitioning in an ATM network. The filter has a classified network buffer for identifying whether data is classified or unclassified to define invalid and valid data packets. Invalid data packets are dropped from the classified network buffer and valid data packets are sent to an unclassified network for testing without interrupting the operation of the classified network. In one embodiment, the classified network buffer is programmable to adapt to the continually changing requirements of classified networks.

Abstract: The present embodiment provides a system and method for lowering the saturated gain level of a thin-disk laser oscillator by multipassing each gain generator in such a way to cancel some of the wavefront error contributions from the disk surfaces. Wavefront aberrations introduced on one pass of the gain disk are canceled through symmetry on successive passes. The reduced wavefront error significantly improves design space for single-mode resonators. Maximum effectiveness is achieved by rotating the gain disk so that the fold plane-of-symmetry reverses the largest wavefront error or specifically chosen functional forms.

Abstract: The present embodiment provides a system and method for lowering the saturated gain level of a thin-disk laser oscillator by multipassing each gain generator in such a way to cancel some of the wavefront error contributions from the disk surfaces. Wavefront aberrations introduced on one pass of the gain disk are canceled through symmetry on successive passes. The reduced wavefront error significantly improves design space for single-mode resonators. Maximum effectiveness is achieved by rotating the gain disk so that the fold plane-of-symmetry reverses the largest wavefront error or specifically chosen functional forms.

Abstract: An electronic network filter for classified partitioning in an ATM network. The filter has a classified network buffer for identifying whether data is classified or unclassified to define invalid and valid data packets. Invalid data packets are dropped from the classified network buffer and valid data packets are sent to an unclassified network for testing without interrupting the operation of the classified network. In one embodiment, the classified network buffer is programmable to adapt to the continually changing requirements of classified networks.

Abstract: An optical imaging system includes an array of small aperture subtelescopes each with heterodyne detectors. The array detects the amplitude and phase of light waves emanating from a scene under observation before they are combined into an image. The beam combining and interfering functions are performed after detection by the use of novel electronic signal processsing. Large-aperture resolution is synthesized by electronically detecting and correcting phase errors without optical phase compensating components. Parallel processing and atmospheric turbulence compensation are achieved. The system images laser illuminated or naturally illuminated targets as well as stationary or moving targets. The heterodyne detectors can also achieve similar results when arranged in a pupil plane array located behind a single large aperture telescope.