Abstract

Wavelength stabilized diode laser light sources are requested for several applications. Beside this, some applications need also a wavelength alternating operation. In the case of absorption spectroscopy, e.g. for DIAL, a switching between wavelengths with large and small absorption coefficient is needed or in the case of Raman spectroscopy a spectral shift of about 10 cm⁻¹ is needed to apply shifted excitation Raman difference spectroscopy (SERDS) to distinguish between Raman lines and disturbing backgrounds like natural or artificial light, scattering or fluorescence.

© 2015 IEEE