Gain saturation studies in LG-750 and LG-770 amplifier glass

Deanna Marie Pennington; David Milam; David Eimerl

doi:10.1117/12.294356

8 December 1997 Gain saturation studies in LG-750 and LG-770 amplifier glass

Deanna Marie Pennington, David Milam, David Eimerl

Proceedings Volume 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference; (1997) https://doi.org/10.1117/12.294356
Event: Second International Conference on Solid State Lasers for Application to ICF, 1996, Paris, France

Abstract

Experiments were performed on the 100-J class Optical Sciences Laser at LLNL to characterize the saturation fluence and small-signal gain of a solid-state Nd:glass amplifier utilizing LG-750 and LG-770, an amplifier glass developed for the National Ignition Facility (NIF). These high quality measurements of gain saturation at NIF level fluences, i.e., 10 - 15 J/cm², provide essential parameters for the amplifier performance codes used to design NIF and future high power laser systems. The small- signal gain, saturation fluence and square-pulse distortion were measured as a function of input fluence and pulse length in platinum-free LG-750 and LG-770. The input fluence, output fluence, small-signal gain and passive losses were measured to allow calculation of the saturation fluence. Least squares fits of the output vs. input fluence data using a Frantz-Nodvik model was used to obtain an average saturation fluence for each data set. Overall, gain saturation in LG-750 and LG-770 is comparable to long pulse lengths. For shorter pulse lengths, < 5 ns, LG-770 exhibits a stronger pulse length dependence than LG-750, possibly de to a longer terminal level lifetime. LG-770 also has a higher cross-section, which is reflected by its slightly higher extraction efficiency.

Citation Download Citation

Deanna Marie Pennington, David Milam, and David Eimerl "Gain saturation studies in LG-750 and LG-770 amplifier glass", Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); https://doi.org/10.1117/12.294356

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