(a) Scheme of pulse stretcher configuration. (b) Sketch of the setup in a 3D presentation.
(a) Beam propagation through the stretcher without matching the wave-front radius [positions (1), (2),… see Fig. 1(a)]. The simulation was performed with a full angle divergence of 5 mrad. The beam diameters at mirrors 1 and 4 are larger than in (b). (b) Beam propagation through the stretcher with cylindrical lens in front of the beam splitter for matching the wave-front radius.
Simulation of stretched pulses for mirrors with 98% reflectivity and different beam splitter reflectivities (a) behind the first stretcher loop and (b) using both stretcher loops.
Measured original pulse as well as stretched pulses using the first, the second, and both stretcher loops, respectively.
Measured beam profiles for the original and for stretched laser pulses.
Nearly linear dependence of on reciprocal 193 nm pulse length.
Spectra integral increases with increasing reciprocal pulse length.
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