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Title: Investigation of free charge carrier dynamics in single-crystalline CVD diamond by two-photon absorption

By using the methods of transient gratings (TGs) and induced absorption, we have studied the kinetics of plasma of free charge carriers (FCCs) created by the action of a picosecond laser pulse in two high-purity diamond single crystals synthesised from the gas phase. The gratings with different spatial periods have been excited at the wavelengths of 266 or 213 nm (above and below the fundamental absorption edge in diamond) and probed with continuous-wave radiation in the visible region. At the moderate FCC concentrations (∼7 × 10{sup 17} cm{sup -3}), the coefficient of ambipolar diffusion and the carrier recombination time of two crystals are 20.3 and 18.9 cm{sup 2} s{sup -1} and 30 and 190 ns, respectively. The increase in the carrier concentration up to 5 × 10{sup 19} cm{sup -3} reduces the TG lifetime. We have determined the conditions under which the relaxation of the grating of carriers leads to the formation of a thermal grating, with the amplitude sufficient for its experimental observation. (interaction of laser radiation with matter. laser plasma)
Authors:
;  [1] ; ; ;  [2] ;  [3]
  1. B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk (Belarus)
  2. A M Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
  3. A.N. Sevchenko Research Institute of Applied Physics Problems, Belarusian State University, Minsk (Belarus)
Publication Date:
OSTI Identifier:
22373339
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 44; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; AMBIPOLAR DIFFUSION; CARRIER LIFETIME; CHARGE CARRIERS; CHEMICAL VAPOR DEPOSITION; CONCENTRATION RATIO; DIAMONDS; GRATINGS; LASER RADIATION; LASERS; MONOCRYSTALS; PHOTONS; PLASMA