Components for Ti:Sapphire Lasers
Components for Ti:Sapphire Lasers
Here we present optical components for Ti:Sapphire lasers which are operated with ns pulses. Please note that all of these components are optimized for smooth group delay (GD) spectra in order to achieve wide tuning ranges. However, these components are not optimized for group delay dispersion (GDD). Such optics which are necessary for fs pulses are introduced
on our page “Components for Femtosecond Lasers”.
Mirrors
Figure 1: Reflectance (a) and GD (b) spectra of a broadband laser mirror Figure 2: Reflectance (a) and GD (b) spectra of a broadband pump mirror Figure 3: Reflectance (a) and GD (b) spectra of a broadband turning mirror Special Features
- Very high reflectance of the mirrors (R > 99.9 % … R > 99.98 % depending on the design)
- Spectral tolerance: 1 % of centre wavelength
- Centre wavelength, bandwidth and reflectivity of partial reflectors according to customer specification
Output Couplers and Beamsplitters
Figure 4: Reflectance spectra of a standard and a broadband output coupler (a) and of an output coupler with a special reflectance profile which enables the compensation of the amplification characteristics of the laser (b)
see also:
B. Jungbluth, J. Wueppen, J. Geiger, D. Hoffmann, R. Poprawe: “High Performance, Widely Tunable Ti:Sapphire Laser with Nanosecond Pulses” in: Solid State Lasers XV: Technology and Devices, Proc. of SPIE Vol. 6100, 6100 - 20, San Jose 2006 Figure 5: Reflectance (a) and GD (b) spectra of a broadband beam splitter PRu(45°, 650 – 1050 nm) = 50 ± 3 % Tolerances
Standard output couplers (bandwidth: 120 – 150 nm): |
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R = 10 … 70 % | ± 2.5 % |
R = 70 … 90 % | ± 1.5 % |
R = 90 … 95 % | ± 0.75 % |
R = 95 … 98 % | ± 0.5 % |
R > 98 % | ± 0.25 % |
Broadband output couplers (bandwidth: 200 – 600 nm): |
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R = 10 … 70 % | ± 3 % |
R = 70 … 90 % | ± 2 % |
R = 90 … 95 % | ± 1 % |
R = 95 … 98 % | ± 0.5 % |
Special Components
Figure 6: Transmittance spectrum of a narrow band intracavity filter for 860 nm which is used to select one wavelength from the Ti:Sapphire spectrum Figure 7: Reflectance spectrum of a special turning mirror which separates the visible part of the Ti:Sapphire laser radiation from the NIR part