CC BY
12LM-I-23
Fundamentals of ultrafast intra-center and interband photoexcitations in bulk diamond for micromarking and tracing
applications
S. Kudryashov1, P. Danilov1, N. Smirnov1, N. Stsepuro1, G. Krasin1, O. Kovalchuk1'2, E. Oleynichuk1, A. Levchenko1, M. Kovalev1, A. Ionin1, N. Melnik1 and R. Khmelnitskiy1
'Lebedev Physical Institute, Moscow, Russia;
2Geo-Scientific Research Enterprise Public Joint Stock Company ALROSA, Mirny, Russia;
e-mail: kudryashovsi@lebedev. ru
This work presents an overview of basic fundamental processes, underlying ultrafast optical and electronic dynamics during femtosecond-laser photoexcitations in natural diamonds (Fig.la) for micromarking and tracing applications. A number of consequent process - non-linear laser propagation of femtosecond-laser pulses [1], spectrally- and intensity-dependent non-linear interband and intra-center (Fig.lb) photoexcitation mechanisms [2], Auger recombination and ambipolar diffusion of dense electron-hole plasma, generation of Frenkel "interstitial-vacancy" pair, atomistic processes of laser-induced modification of the present optical centers in diamond are overviewed, using our recent original results.
300 400 500 600 700 valence band
wavelength (nm)
Fig.1. (a) Schematic of 1030-nm high-NA femtosecond-laser photoexcitation in diamond. (b) 3-photon blue-range A-band intra-center photoluminescence dynamically switching to 2-photon green-range photoluminescence from the intermediate process due to upper-level
saturation, and the related three-level energy diagram.
This study is funded by the grant of Russian Science Foundation (project no. 21-79-30063).
[1] S.I. Kudryashov, A.O. Levchenko, P.A. Danilov, N.A. Smirnov, and A.A. Ionin, IR femtosecond laser micro-filaments in diamond visualized by inter-band UV-photoluminescence, Optics Letters, 45 (7), 2026-2029, (2020).
[2] S. Kudryashov, P. Danilov, N. Smirnov, A. Levchenko, O. Kovalchuk, R. Khmelnitskii, M. Uspenskaya, and M. Kovalev, Broadband and fine-structured luminescence in diamond facilitated by femtosecond laser driven electron impact and injection of "vacancy-interstitial" pairs, Optics Letters, 46 (6), 1438-1441, (2021).
