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Proceedings Paper

Laser spectroscopic and saturation properties of GR1 centers in synthetic diamond
Author(s): Shova Subedi; Vladimir Fedorov; Sergey Mirov; Matthew Markham
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Paper Abstract

The neutral vacancy (GR1) centers are the intrinsic lattice defects in diamond with interesting optical properties. In the present work, we performed optical characterization of the GR1 centers in CVD-grown bulk diamond to explore their laser feasibility. The non-linear optical measurements reveal efficient saturable absorption of ground level of the centers under ns-pulsed excitation at 632 nm. The transmission changes from 55% at small incident intensity to 84% at the saturated level. The experimentally measured data was fitted with equations representing two limiting cases and obtained the saturation parameters, namely saturation fluence (6.8 mJ/cm2) and saturation intensity (6.4 MW/cm2), at 633 nm for ground state absorption. The intensity of saturation 6.4 MW/cm2 obtained after fitting the experimental data is two orders of magnitude smaller than that at 694 nm documented in the literature for GR1 centers in natural diamond. The calculation gives essentially the same value of absorption cross-section (⁓4.5 × 10-17 cm2) at 633 nm for both approximations. We also estimated the radiative lifetime and quantum yield as about 8.5 ns and 13%, correspondingly. The cross-sections were estimated for transition 1E ↔ 1T2. The emission cross-section was obtained to be ⁓9 × 10-17 cm2 near the maximum of emission band. Such a high absorption cross-section and fast recovery of ground state in combination with high concentration of the centers can provide high optical gain.

Paper Details

Date Published: 21 February 2020
PDF: 7 pages
Proc. SPIE 11259, Solid State Lasers XXIX: Technology and Devices, 1125928 (21 February 2020); doi: 10.1117/12.2546934
Show Author Affiliations
Shova Subedi, The Univ. of Alabama at Birmingham (United States)
Vladimir Fedorov, The Univ. of Alabama at Birmingham (United States)
Sergey Mirov, The Univ. of Alabama at Birmingham (United States)
Matthew Markham, Element Six (UK) Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 11259:
Solid State Lasers XXIX: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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