Components for the Higher Harmonics of the Ti:Sapphire Laser (140 – 250 nm)
The fourth, fifth and sixth harmonics of the Ti:Sapphire laser provide fs-pulses in the DUV/VUV range. These harmonics offer a variety of applications in spectroscopy as well as in materials science. Optics for these very special applications must be optimized for high reflectance and low dispersion. Mirrors and separators for the wavelength range 125 – 215 nm consist of fluoride layer systems on CaF2 substrates while components for longer wavelengths can be made of oxides. For mirrors, LAYERTEC recommends substrates with a thickness of 3 mm or 6.35 mm to achieve good flatness values. For special separators, LAYERTEC offers substrates of Fused Silica or calcium fluoride as thin as 1 mm or 0.5 mm.
Bandwidth of the Reflectance and Low-GDD Range of Standard Components
- The coatings described on page Components for the Third Harmonic of the Ti:Sapphire Laser (250 – 400 nm) can be used to achieve center wavelengths as given in the following table. Different coating materials are used for different wavelength ranges
- All coatings are optimized for broad reflection bands, high reflectance and low GDD
| Component | Wavelength Range | P-Polarization (|GDD| < 20 fs²) | S-Polarization (|GDD| < 20 fs²) |
|---|---|---|---|
| Turning mirror or separator 3rd harmonic | 250 nm – 330 nm | 30 nm (R > 99 %) | 50 nm (R > 99 %) |
| Dual wavelength turning mirror | 250 nm – 330 nm 370 nm – 500 nm | 15 nm (R > 99 %) 34 nm (R > 99 %) | 26 nm (R > 99 %) 72 nm (R > 99 %) |
| Turning mirror or separator 4th harmonic | 180 nm – 250 nm | 5 nm (R > 93 %) | 15 nm (R > 97 %) |
| Turning mirror or separator 5th harmonic | 140 nm – 180 nm | 4 nm (R > 90 %) | 12 nm (R > 97 %) |
| Turning mirror or separator 6th harmonic | 125 nm – 140 nm | 8 nm (R > 85 % unpolarized) | |
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