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Single-Longitudinal-Mode Lasers

Photonics Spectra
Nov 2012
Coherent Inc.Request Info
SANTA CLARA, Calif., Aug. 21, 2012 — Two new Verdi G lasers from Coherent Inc. offer single-longitudinal-mode (SLM) output. The Verdi G SLM series lasers deliver a linewidth of <5 MHz, which corresponds to a coherence length of tens of meters. They are offered with a choice of 2 and 5 W of output power at 532 nm.

They are based on optically pumped semiconductor laser (OPSL) technology, which is characterized by low noise, high electrical efficiency, a small platform, high stability and reliability. Single-frequency OPSLs deliver mode-hop-free output over hours of continuous operation.

The lasers are targeted at applications where narrow linewidth and/or long coherence length are critical, such as interferometry and holography. They also are suitable for atom cooling and trapping.


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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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