Components for third harmonic of the Ti:Sapphire Laser
Components for the Third Harmonic of the Ti:Sapphire Laser
The third harmonic of the Ti:Sapphire laser provides fs - pulses in the UV range (∼250 – 330nm). These offer a variety of applications in spectroscopy as well as in materials science. Optics for these very special applications must be optimized for both high reflectivities and low dispersion. For more information about optics for the third and the higher harmonics please see our Components for the higher harmonic of Ti:Sapphire laser section or pages 70 – 71 of our catalog.
Dual Wavelength Mirrors
Seperators for the Third Harmonic and the Ground Wave
Reflectance spectra of separators for the third and fourth harmonics:
HRr (45°, 266nm) > 98% + Rr (45°, 200nm) < 10%
a) oxide coatings optimized for low straylight losses (rear side uncoated )
b) flouride coatings for high laser induced damage thresholds and high transmission at 200nm (rear side uncoated)
Please note that aluminum oxide which is the high refractive index material for DUV oxide coatings exhibits absorption losses for wavelengths < 215nm, while fluoride coatings are free of absorption down to wavelengths as low as 140 nm.
Broadband Separators for the Third Harmonic
Separators with high reflectivity and low GDD in a broad wavelength range in the UV and high transmission in the VIS and NIR are still under investigation. In the following we present some sputtered coatings which meet these demands.