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Frequency doubling of multi-terawatt picosecond pulses

  • D. NEELY (a1), C.N. DANSON (a1), R. ALLOTT (a1), F. AMIRANOFF (a2), J.L. COLLIER (a1), A.E. DANGOR (a3), C.B. EDWARDS (a1), P. FLINTOFF (a1), P. HATTON (a1), M. HARMAN (a1), M.H.R. HUTCHINSON (a1), Z. NAJMUDIN (a3), D.A. PEPLER (a1), I.N. ROSS (a1), M. SALVATI (a3) and T. WINSTONE (a1)...

Abstract

The frequency-doubling efficiency and resultant focal spot quality of a large aperture (140 × 89 mm) subpicosecond, chirped pulse amplified (CPA) 1054-nm beam for laser–matter interaction studies has been investigated using the Vulcan Nd:glass laser system (Danson et al. 1998). The effect of B-integral on the CPA beam quality was studied and is shown not to be the dominant cause of the observed frequency-doubled beam break-up. Conversion efficiency tests were carried out on small aperture KDP (type 1) crystals at a range of incident intensities up to 3 × 1011 W/cm2 giving the optimum crystal thickness for pulses in the 0.3–3 ps region. A large-aperture frequency-doubled beam was commissioned and delivered pulses of over 10 TW onto target for an electron acceleration experiment.

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