John F. Schultz

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Background: The surgical management of hepatic tumors has traditionally relied on preoperative contrast-enhanced computed tomography (CECT) in combination with intraoperative ultrasonography (IOUS). Unfortunately, the ability to detect and characterize hepatic tumors by using CECT is limited, and IOUS frequently reveals additional disease that alters the(More)
Many system analysis type codes have gone to a modeling technique that use modulation transfer function representations of random optical aberrations to calculate the overall system performance. Many aberrations ranging from turbulence distortions to device beam quality have been modeled in this way with good success. But to date these simulations have only(More)
The management of hepatic tumors presents a challenging problem. The natural history of primary and metastatic liver lesions portends a poor prognosis. However, surgical resection and newer ablative techniques have had a great impact on cure rates. Unfortunately, the majority of newly diagnosed patients have surgically unresectable disease. Advances in(More)
The cavity dumping technique, applied to free electron lasers (FEL), is described. Taking advantage of both numerical simulations and experimental results on the Mark III FEL, a fairly exhaustive analysis is reported. In particular, we show that the output peak power can be increased by a factor even higher than one hundred. The cavity dumping experiment,(More)
The small size, high power, promise of access to any wavelength between 3.5 and 16 microns, substantial tuning range about a chosen center wavelength, and general robustness of quantum cascade (QC) lasers provide opportunities for new approaches to ultra-sensitive chemical detection and other applications in the mid-wave infrared. PNNL is developing novel(More)
After briefly reporting on the present status of the infrared free-electron laser now operating at the Stanford Photon Research Laboratory and powered by the linear accelerator Mark III, we discuss the results of using nonlinear optical techniques for both the characterization of its output radiation and the enhancment of its tunability range. In(More)
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