8 December 1997 Gain saturation studies in LG-750 and LG-770 amplifier glass
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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.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Deanna Marie Pennington, Deanna Marie Pennington, David Milam, David Milam, David Eimerl, 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); doi: 10.1117/12.294356; https://doi.org/10.1117/12.294356
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