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As a result of these changes, Coherent's productivity improved 60 percent, while its costs decreased 58 percent. [4] By the 1990s, medical lasers accounted for half of Coherent's revenues. [4] In the mid-1990s, Coherent acquired Applied Laser Systems, ATx Telecom Systems, Inc., Uniphase Corporation, and 80 percent of Tutcore Oy, LTD.
For instance, the laser, superconductivity and superfluidity are examples of highly coherent quantum systems whose effects are evident at the macroscopic scale. The macroscopic quantum coherence (off-diagonal long-range order, ODLRO) [ 25 ] [ 26 ] for superfluidity, and laser light, is related to first-order (1-body) coherence/ODLRO, while ...
James Clerk Maxwell played a major role in developing the concept of a coherent CGS system and in extending the metric system to include electrical units.. A coherent system of units is a system of units of measurement used to express physical quantities that are defined in such a way that the equations relating the numerical values expressed in the units of the system have exactly the same ...
Thus a heterodyne array must usually have parallel direct connections from every sensor pixel to separate electrical amplifiers, filters, and processing systems. This makes large, general purpose, heterodyne imaging systems prohibitively expensive. For example, simply attaching 1 million leads to a megapixel coherent array is a daunting challenge.
Phase-sensitive coherent optical time-domain reflectometry (Φ-OTDR) is a technique that can provide sufficient sensitivity and resolution for these distributed acoustic sensing systems. [2] Standard optical time-domain reflectometry techniques use light sources with coherence lengths, which are shorter than pulse lengths. This can yield a sum ...
Multimode helium–neon lasers have a typical coherence length on the order of centimeters, while the coherence length of longitudinally single-mode lasers can exceed 1 km. Semiconductor lasers can reach some 100 m, but small, inexpensive semiconductor lasers have shorter lengths, with one source [4] claiming 20 cm. Singlemode fiber lasers with linewidths of a few kHz can have coherence ...
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