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Photonics Spectra
Mar 2006
TOPTICA Photonics AGRequest Info
SINGLE-FREQUENCY LASER For use in Raman applications, gas sensing, interferometry, holography and drug screening, Toptica Photonics AG has unveiled the single-frequency dfBeam diode laser. It combines features of the iBeam series with those of distributed feedback laser diodes. It offers a linewidth of <0.001 cm–1, a coherence length of >2.5 m, diffraction-limited TEM00 beam quality, a circular beam shape and a 156 × 56 × 66-mm3 footprint. The company says that coherence properties are maintained even under harsh conditions, and that mode competition and mode hops are eliminated. All laser parameters can be set and monitored using a PC and an RS-232 interface. Standard wavelengths are 760, 763, 773, 780 and 785 nm, with others available upon request. Single-mode fiber coupling also is available.


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The optical recording of the object wave formed by the resulting interference pattern of two mutually coherent component light beams. In the holographic process, a coherent beam first is split into two component beams, one of which irradiates the object, the second of which irradiates a recording medium. The diffraction or scattering of the first wave by the object forms the object wave that proceeds to and interferes with the second coherent beam, or reference wave at the medium. The resulting...
The study and utilization of interference phenomena, based on the wave properties of light.
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