Propagation and absorption of high-intensity femtosecond laser radiation in diamond

Journal Article · Wed Dec 31 04:00:00 EST 2014 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2014V044N12ABEH015459· OSTI ID:22373317

Konov, V I; Gololobov, V M; Zavedeev, E V ^[1]

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1. A M Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

Femtosecond interferometry has been used to experimentally study the photoexcitation of the electron subsystem of diamond exposed to femtosecond laser pulses of intensity 10{sup 11} to 10{sup 14} W cm{sup -2}. The carrier concentration has been determined as a function of incident intensity for three harmonics of a Ti : sapphire laser (800, 400 and 266 nm). The results demonstrate that, in a wide range of laser fluences (up to those resulting in surface and bulk graphitisation), a well-defined multiphoton absorption prevails. We have estimated nonlinear absorption coefficients for pulsed radiation at λ = 800 nm (four-photon transition) and at 400 and 266 nm (indirect and direct two-photon transitions, respectively). It has also been shown that, at any considerable path length of a femtosecond pulse in diamond (tens of microns or longer), the laser beam experiences a severe nonlinear transformation, determining the amount of energy absorbed by the lattice, which is important for the development of technology for diamond photostructuring by ultrashort pulses. The competition between wave packet self-focusing and the plasma defocusing effect is examined as a major mechanism governing the propagation of intense laser pulses in diamond. (interaction of laser radiation with matter. laser plasma)

• OSTI ID: 22373317
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 12 Vol. 44; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABSORPTION
CHARGE CARRIERS
CONCENTRATION RATIO
DIAMONDS
ELECTRONS
HARMONICS
INTERFEROMETRY
LASER RADIATION
LASERS
MULTI-PHOTON PROCESSES
NONLINEAR PROBLEMS
PHOTONS
PLASMA
PULSES
SAPPHIRE
SURFACES
WAVE PACKETS