Few-cycle fs-pumped NOPA with passive ultrabroadband spectral shaping

Optics Express
Issa TamerMalte C Kaluza

Abstract

A compact, femtosecond-pumped noncollinear optical parametric amplifier (NOPA) is presented with a passive spectral shaping technique, employed to produce a flat-top-like ultrabroadband output spectrum. The NOPA is pumped by a dedicated 2 mJ, 120 fs Yb3+-based CPA system, which generates both the second harmonic pump pulse and white light supercontinuum as the signal pulse. A chirped mirror pair pre-compensates the material GVD within the optical path of the signal pulse to produce a near-FTL pulse duration at the OPA crystal output. By optimizing both the pump/signal cross angle and the pump/signal delay, the 40 cm × 40 cm footprint, single-pass, fs-pumped, direct NOPA (non-NOPCPA) system generates a record 20 µJ, 11 fs pulses at 820 nm central wavelength with a bandwidth of 230 nm FWHM, to be used as an ultrashort optical probe pulse for relativistic laser-plasma interactions at the petawatt-class POLARIS laser system.

References

Oct 17, 2014·Optics Express·Hartmut LiebetrauMalte C Kaluza
Feb 16, 2017·Optics Letters·Lukáš IndraBedřich Rus
Nov 22, 2019·Scientific Reports·Georg A BeckerMalte C Kaluza

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