Advanced pulse generator and preamplifier for the HELEN laser

Michael J. Norman; E. J. Harvey; N. W. Hopps; J. R. Nolan; W. F. E. Smith

doi:10.1117/12.294280

8 December 1997 Advanced pulse generator and preamplifier for the HELEN laser

Michael J. Norman, E. J. Harvey, N. W. Hopps, J. R. Nolan, W. F. E. Smith

Proceedings Volume 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference; (1997) https://doi.org/10.1117/12.294280
Event: Second International Conference on Solid State Lasers for Application to ICF, 1996, Paris, France

Abstract

A replacement for the HELEN laser has been proposed that would involve a considerable increase in performance up to 100 TW from 32 beams. The design for the new laser is to be based on the technology being developed for the US National Ignition Facility. The pulse generation and preamplification stages employ novel technologies and represent a significant departure from previous designs. As part of the laser replacement development program a pulse generator and preamplifier have been built and installed on the HELEN laser at AWE, based on those employed on the Beamlet laser physics demonstration facility at Lawrence Livermore National Laboratory. As well as providing experience of the technologies involved, this system represents a significant enhancement of the performance of HELEN. Initial pulses are generated by a diode-pumped Q-switched Neodymium-doped Yttrium Lithium Fluoride ring oscillator. These are then launched into optical fiber and transported to a series of two integrated optics amplitude modulators for pulse shaping. The resulting pulses are then transported by optical fibers to a ring regenerative preamplifier for amplification to a level suitable for input to the HELEN laser. We describe this system, its performance and the enhanced capabilities of the HELEN laser resulting from its installation.

Citation Download Citation

Michael J. Norman, E. J. Harvey, N. W. Hopps, J. R. Nolan, and W. F. E. Smith "Advanced pulse generator and preamplifier for the HELEN laser", Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); https://doi.org/10.1117/12.294280

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