Absorption in high-Z targets illuminated with 527-nm laser light at high intensity using induced spatial incoherence

Journal Article · Sat Oct 20 00:00:00 EDT 1990 · Applied Optics; (USA)

DOI:https://doi.org/10.1364/AO.29.004447· OSTI ID:5903589

Simpson, J D; Bosch, R A; Failor, B H; Gabl, E ^[1]

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1. KMS Fusion, Inc., Ann Arbor, MI (USA)

We have measured 527-nm absorption for induced spatial incoherence (ISI) and non-ISI illumination of high-Z targets over the 0.5--3.5 {times} 10{sup 14}-W/cm{sup 2} laser intensity range using energy balance with a custom designed 30-cm diam light integrating sphere. Induced spatial incoherence of the laser beam was produced by inserting echelons in the beam path and operating the laser at wide bandwidth (0.2%). To produce ISI and non-ISI data for comparison, we irradiated a large number of 180-{mu}m diam gold disks with 0.5--1.5-ns pulses with echelons in the beam path with and without wide laser bandwidths. Our data show an increase in absorption of 5--11% for the ISI illuminated targets and also suggest a weaker dependence of absorption on laser intensity for ISI illumination than for non-ISI.

• OSTI ID: 5903589
• Journal Information: Applied Optics; (USA), Vol. 29:30; ISSN 0003-6935
• Country of Publication: United States
• Language: English

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