Thin-disk laser pump schemes for large number of passes and moderate pump source quality

Abstract

Novel thin-disk laser pump layouts are proposed yielding an increased number of passes for a given pump module size and pump source quality. These novel layouts result from a general scheme which bases on merging two simpler pump optics arrangements. Some peculiar examples can be realized by adapting standard commercially available pump optics simply by introducing an additional mirror-pair. More pump passes yield better efficiency, opening the way for usage of active materials with low absorption. In a standard multi-pass pump design, scaling of the number of beam passes brings about an increase of the overall size of the optical arrangement or an increase of the pump source quality requirements. Such increases are minimized in our scheme, making them eligible for industrial applications.

Passive alignment stability and auto-alignment of multipass amplifiers based on Fourier transforms

“…This mirror pair inverts the tilt and the excursion of the beam from the optical axis in the y-direction while it does not affect the tilt and the excursion in the x-direction. Hence, as already shown in [22], a vertical retro-reflector significantly increases the alignment stability in the vertical direction. Here, the evaluation of the alignment stability of [22] has been advanced to include aperture effects.…”

“…Hence, as already shown in [22], a vertical retro-reflector significantly increases the alignment stability in the vertical direction. Here, the evaluation of the alignment stability of [22] has been advanced to include aperture effects. As can be seen by comparing Fig.…”

“…8. The measured data were already presented in [22] but here they are compared with the theoretical predictions of Eqs. (16) and (17).…”

New compact pump geometry for thin disk lasers with a tilted optical long-pass filter

“…Thin disk lasers can emit high brightness laser light with powers up to several kilowatts by allowing high pump power densities. [1][2][3][4] These high pump power densities are technically feasible due to the thin active medium, which can be cooled efficiently from one side. The thin active medium on the other hand limits the light matter interaction for the lasing process per pass, so that photons need to be redirected onto the thin disk multiple times to allow for efficient implementations.…”

Ultrarövid impulzusok erősítése következő generációs titán-zafír lézerrendszerekben

“…Bár az Yb:YAG tipikusan magasabb szinten adalékolható, mint a Ti:Sa, a pumpateljesítmény megfelelő szintű abszorbeálásához így is több tíz passzt kell kialakítani a pumpanyalábra vonatkozóan [116]. Ehhez bonyolult leképező tükörrendszert szokás megvalósítani, hogy a pumpanyaláb mérete és minősége az aktív közegben azonos legyen a passzok során [118]. Érdemes megemlíteni, hogy a koronglézerek pumpálásra használt dióda lézerek nyalábminősége jelentősen elmarad a Ti:Sa rendszerek esetén használt villanólámpás Nd:YAG vagy a DPSS pumpalézerekétől.…”