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Ti:Sapphire oscillator laser system
Our Ti:Sapphire femtosecond oscillator was developed using self-mode-locked principle.
The cavity configuration is shown in the block schematic diagram. This cavity
consistes of an end mirror, an output coupler, a pair of prisms, focusing fold
mirrors, birefringent filter, tuning slit, and Ti:Sapphire crystal. A 6.7 W of
all-link radiation from a Coherent Innova 300 Ar-ion laser is focused into the
Ti:Sapphire crystal, collinear with the mode of the cavity itself. The Ti:Sapphire
crystal rod is Brewster-angle cut, 1.0 cm in length. Two concave mirrors in an
off-axis "Z" configuration allow the compensation of astigmatism, while a pair
of Brewster-cut fused silica (SF11) prisms are used to compensate for spectral
dispersion (chirp) of the crystal. A single-plate birefringent filter ins inserted
in the cavity to choose the central wavelength over the range 720-850 nm. Pulsing
is established by tapping of the prism pair femtosecond laser and chirped pulse
amplification (CPA).
Fig.2: Diagram of Ti:Sapphire self-mode-locked oscillator and pulse stretcher
References:
1. D.E. Spence, P.N. Kean, and W. Sibbet, Opt. Lett. 16, 42 (1991).
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