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  • 488-, 532-nm Sapphire SF OPSLs
Jul 2011
Coherent Inc.Request Info
SANTA CLARA, Calif., July 25, 2011 — 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/°C), power stability of <2%) and noise of <0.25% rms from 20 Hz to 2 MHz.

The lasers are based on the proprietary optically pumped semiconductor laser (OPSL) technology, which features low output noise because its short upper-state lifetime eliminates the “green noise” that limits the noise performance of many other solid state-lasers. They also don’t suffer from thermal lensing issues commonly found in frequency-doubled diode-pumped solid-state lasers. The technology is wavelength- and power-scalable.

The devices are suitable for use in research and OEM applications that require a narrow spectral linewidth and/or a long coherence length. Primary applications include Raman spectroscopy, Brillouin scattering, holography/stereography, interferometry, metrology, inspection and remote optical sensing.


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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.
The study and utilization of interference phenomena, based on the wave properties of light.
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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