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Ultranarrow-Linewidth Lasers

Photonics Spectra
Oct 2011
Coherent Inc.Request Info
 
Coherent Inc. has expanded its Sapphire line of compact, continuous-wave visible lasers with several ultranarrow-linewidth models. The new Sapphire SF lasers are available at wavelengths of 488 and 532 nm, and feature single longitudinal output to achieve a linewidth of <1.5 MHz. They are offered with output powers of 20, 50 and 100 mW at 488 nm, and 20, 50, 100 and 150 mW at 532 nm. Independent of wavelength and power class, they are identical in form, fit and function. They provide a high-quality diffraction-limited TEM00 beam with M2 of <1.1, pointing stability of <5 µrad/ºC, power stability of <2% and noise of <0.25% rms from 20 Hz to 2 MHz. The lasers are based on optically pumped semiconductor laser technology.


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GLOSSARY
Brillouin scattering
The nonlinear optical phenomenon of the spontaneous scattering of light in a medium by its interaction with sound waves passing through the medium. The scattering takes place on an atomic level.
interferometry
The study and utilization of interference phenomena, based on the wave properties of light.
metrology
The science of measurement, particularly of lengths and angles.
Raman spectroscopy
That branch of spectroscopy concerned with Raman spectra and used to provide a means of studying pure rotational, pure vibrational and rotation-vibration energy changes in the ground level of molecules. Raman spectroscopy is dependent on the collision of incident light quanta with the molecule, inducing the molecule to undergo the change.  
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