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Lasers Use Of Optical Intensification - something

Lockheed Martin breakthroughs are boosting the performance of laser weapon systems for ground, air and sea platforms while shrinking their size, weight and power consumption. This includes spectral beam combining, adaptive optics, precision pointing, line-of sight stabilization and air-flow control. We have showcased many of these technologies in our kilowatt prototype system, which has defeated small airborne and sea-based targets, and our kilowatt test bed system, which has disabled a stationary truck target. Lasers Use Of Optical Intensification.

Lasers Use Of Optical Intensification Video

From nonlinear optics to high-intensity laser physics

Selfoc microlens connected to the transmitting fibers to collimate laser beams out of the fibers. This invention relates to an optical equipment of a laser Doppler velocimeter which utilizes an interference of two laser beams to measure velocity, for example flow in a pipe, combusting flow, flow in a engine, and so on.

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Especially, this invention relates a optical equipment of a fiber laser Doppler velocimeter probe and an optical equipment of a manipulator to transmit a laser into a fiber. Generally, in laser Doppler velocimeters, a laser beam is split into two beams and collimated. These two beams are focused by a front lens and form a measurement volume wherein an interference fringe are made. A particle in flow, for example a dust, https://amazonia.fiocruz.br/scdp/blog/gregorys-punctuation-checker-tool/diversity-within-the-taxonomic-group-of-lagormorpha.php the measurement volume causes scattering light, which is detected at a photomultiplier and transformed into electric Doppler burst signals.

The velocity of the flow is obtained by processing the Doppler signal by a signal processing system.

In fiber LDVs, optical fibers are used to transmit laser power to a measurement volume and to transmit a scattered light Intensifiaction a photomultiplier. In a compact type of fiber LDV, a beam out of a Selfoc micro lens can not be expanded due to its compact size so that the measurement volume becomes large which decrease a signal-to-noise ratio.

Furthermore, the troublesome light scattered when laser beam passes through a lens causes noise and decrease an accuracy of the measurement.

1. Introduction

A space filter to cut off the troublesome light scattered can not be used in the compact fiber LDV due to its size. In a large click of fiber LDV probe, a beam expander is used to make the beam diameter large to make the measurement volume small to increase a light scattered intensity and a complicated adjustment of an optics is required. At a manipulator, a focused laser beam has to be positioned in a core of a fiber, a, as shown in Optival.

Since the core diameter of the fiber is 3 to 4 um, a resolution of the adjustment of less than one micron is needed which can OOptical be achieved even using a micro meter. Especially, a polarization preserving single mode fiber has small numerical aperture, NA. This means that when a laser beam focused to transmit laser power into a fiber the focused diameter has to be smaller than the core diameter of the fiber and NA of the focusing laser beam has to be smaller than the fiber's NA.

The principle object of this invention is to Lasers Use Of Optical Intensification a beam expander with a perforated lens to increase a SN ratio and decrease a number of an optics, a complicated adjustment of an optics, and a probe diameter.

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Usr The use of the perforated concave lens and plano-convex lens combination as a beam expander contributes to make a measurement volume small for high scattered light intensity, to cut off troublesome light scattered when a laser beam passes through a lens, that is, a space filter.

A three point supporting mechanism to tilt an end of a rod glass and a tube in which a lens and a fiber are fixed enables us a high resoution adjustment by commercially available screws, so that a high coupling efficiency can be achieved. To attain the above-mentioned object, this invention Lasers Use Of Optical Intensification done both in a fiber LDV probe and a manipulator. In the fiber LDV probe, the transmitting fibers, 4, 4, having Selfoc microlens, 41, 41, are collimated and installed.]