Components for second harmonic of Ti:Sapphire laser

Figure 1: Reflectance (a) and GDD spectra (b, c) of a fs - optimized dual wavelength mirror for 400nm + 800nm

Figure 2: Reflectance (a) and GDD spectra (b, c) of a fs - optimized dual wavelength turning mirror for 400nm + 800nm

The second harmonic of the Ti:Sapphire laser provides fs-pulses in the NUV and VIS spectral range. This offers 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. Also negative dispersion mirrors for pulse compression are of interest.

• Very high reflectivity (R > 99.9 %)
• Centre wavelength and bandwidth according to customer specifications
• Spectral tolerance 1% of centre wavelength

Figure 3: Reflectance- (a) and GDD - spectra (b) of a separator HR 400 nm + HT 800 nm (AOI = 45°)

Figure 4: Reflectance- (a) and GDD - spectra (b) of a separator HR 800 nm (optimized for p - polarization) + HT 400 nm (AOI = 45°)

• Reflectivity R > 99.9 % for s - and p - polarization in the reflection band
• Bandwidth of the 800 nm reflection band > 200nm for p - polarization
• Transmission T > 95 % for s - and p - polarization in the transmission band
• In principle, these components work for p - and s - polarization, but the performance can be optimized if the polarization is clearly specified
• All separators exhibit |GDD| < 20 fs² in the transmission band

Figure 5: Reflectance (a) and GDD - spectra (b) of a negative dispersion mirror pair for 375nm – 450nm with GDD ≈ -15fs²

• Prototype production according to customers specifications
• In house design calculation and measurement capabilities