Spherical implosion experiments have been performed using shaped laser pulses at A, 0=0.53 pm to illuminate deuterium-filled polyvinyl alcohol (PVA) spherical shells. The deuterium fuel was cryogenically cooled to form a uniform frozen fuel layer. Plasma diagnostics included time-resolvedx-ray radiography and multiframe holographic interferometry.These and other measurements in conjunction with hydrodynamic simulations establish the importance of shaped laser pulses in achieving high fuel compressions.