Recovery of CVD Diamond Detectors using Laser Double Pulses

Conference · Tue Sep 27 04:00:00 EDT 2005

DOI:https://doi.org/10.1051/jp4:2006133191· OSTI ID:883548

Dauffy, L S; Lerche, R A; Schmid, G J; Koch, J A; Silbenagel, C

A 5 x 0.25 mm Chemical Vapor Deposited (CVD) diamond detector, with a voltage bias of + 250V, was excited by a 400 nm laser (3.1 eV photons) in order to study the saturation of the wafer and its associated electronics. In a first experiment, the laser beam energy was increased from a few tens of a pJ to about 100 {micro}J, and the signal from the diamond was recorded until full saturation of the detection system was achieved. Clear saturation of the detection system was observed at about 40 V, which corresponds with the expected saturation at 10% of the applied bias (250V). The results indicate that the interaction mechanism of the 3.1 eV photons in the diamond (E{sub bandgap} = 5.45 eV) is not a multi-photon process but is linked to the impurities and defects of the crystal. In a second experiment, the detector was irradiated by a saturating first laser pulse and then by a delayed laser pulse of equal or smaller amplitude with delays of 5, 10, and 20 ns. The results suggest that the diamond and associated electronics recover within 10 to 20 ns after a strong saturating pulse.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 883548
• Report Number(s): UCRL-PROC-216119
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
DEFECTS
DETECTION
DIAMONDS
IMPURITIES
LASERS
PHOTONS
SATURATION