Coherent has expanded its Sapphire line of compact, continuous-wave, visible lasers with several ultra-narrow line-width models for applications such as Raman spectroscopy and remote optical sensing.
The new Sapphire SF lasers are available at wavelengths of 488nm and 532nm and feature single longitudinal output to achieve a line width of less than 1.5MHz.
They are offered with output powers of 20mW, 50mW and 100mW at 488nm and 20mW, 50mW, 100mW and 150mW at 532nm.
Independent of wavelength and power class, Sapphire SF lasers are identical in form, fit and function.
They provide a diffraction-limited beam (TEM00, M<1.1) with excellent pointing stability (<5urad/C), high power stability (<2 per cent) and low noise (<0.25 per cent RMS from 20Hz to 2MHz), according to the company.
Coherent's Sapphire lasers are based on the optically pumped semiconductor laser (OPSL) technology.
OPSL technology features low output noise because its short upper state lifetime completely eliminates the 'green noise' that limits the noise performance of many other solid-state lasers, according to the company.
In addition, they do not suffer from the thermal lensing issues commonly found in frequency doubled DPSS lasers (such as Nd:YAG).
OPSL technology is both wavelength and power scalable.
The new Sapphire SF lasers are suitable for research and OEM applications that require a narrow spectral line width and/or a long coherence length.
Primary applications include Raman spectroscopy, Brillouin scattering, holography/stereography, interferometry, metrology, inspection and remote optical sensing.
