Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Conference on Lasers and Electro-Optics

Pump-probe experiments of the excited state dynamics of GR1 centers in diamond

Shova D. Subedi, Vladimir Fedorov, Sergey Mirov, Matthew Markham

Published Jan 1, 2021• 0 citations
Publisher

Abstract

The 658 nm probe kinetics revealed strong bleaching and multiexponential decay of the excited level with additional relaxation via intersystem crossing. The origin of induced excited state absorption was due to some other center impurity center.
DOI
10.1364/cleo_si.2021.sm1q.3

Related papers

Study of relaxation dynamics of excited state of GR1 centers in diamond

Shova D. Subedi, Vladimir Fedorov, Sergey Mirov +1 more

We study the decay kinetics of excited state of GR1 center in diamond using 633 nm pump pulse and 658 nm CW probe beam. The absorption saturation followed by a strong absorption of the probe below steady-state transmission level was observed. The recovery of the centers to the original level occurs slowly with ~500 ns time scale and reveals multi-exponential rates with no long-term bleaching or residual absorption. The branching ratio for relaxation process to the ground state and to the metastable state was estimated to be ~ 0.50.

SPIE Solid State Lasers: Technology and Devices•Mar 4, 2021•0 citations

Nonlinear Optical Absorption and Relaxation Kinetics of GR1 Centers in Diamond

Shova D. Subedi, Vladimir Fedorov, Sergey Mirov +1 more

We report on saturation of GR1 centers absorption resulting in ~70% inversion. Probe kinetics revealed strong bleaching of ground level followed by relaxation to metastable level with branching ratio ~0.5.

Optica Laser Congress (ASSL, LAC, LS&C)•Jan 1, 2020•0 citations

Spectroscopy of GR1 centers in synthetic diamonds

Shova D. Subedi, Vladimir Fedorov, Sergey Mirov +1 more

We report on the spectroscopic characterization, absorption saturation, and excited-state dynamics of GR1 centers in synthetic diamonds. The non-linear optical measurements reveal an efficient bleaching of the GR1 center’s ground level under ns-pulsed 633 nm excitation. The maxima of absorption and emission cross sections were estimated to be 4.5 × 10−17 cm2 and 9 × 10−17 cm2 at 630 nm and 780 nm, respectively. The radiative lifetime of the excited level was estimated to be 8.5 ns. The 658 nm probe kinetics uncovered relaxation of 1T2 excited level going predominantly to a metastable state with a lifetime of 220 μs. An induced absorption detected with the use of a highly concentrated diamond sample could be due to up-conversion and photoionization processes in additional impurity-vacancy center with absorption at the short-wavelength tail of GR1. The results presented here indicate that synthetic diamonds with GR1 centers could serve as near infrared gain media or passive Q-switchers for laser cavities over the 633–750 nm spectral range. Optimization of the center concentration and the crystal parameters are required to minimize the induced absorption at the lasing wavelengths.

Optical Materials Express•Feb 12, 2021•20 citations

Saturation spectroscopy of NV− centers in diamond

Shova D. Subedi, Vladimir Fedorov, Sergey Mirov +2 more

We report saturation of NV− centers resulting in ~40% inversion level under 632nm pumping. Δk/ko kinetics revealed long recovery time of NV− centers after photoionization under 532nm pump, which involved different relaxation channels depending on the probe beam wavelengths.

Optica Laser Congress (ASSL, LAC, LS&C)•Jan 1, 2018•4 citations

Two-beam coupling by nitrogen-vacancy centers in diamond

David A. Redman, Q. Z. Shu, Alan Lenef +1 more

A new method for two-beam coupling measurements based on acousto-optic modulation with subhertz tuning capability is applied to study excited-state dynamics of the nitrogen-vacancy center in diamond. Results yield fundamental decay constants and the nonlinear refractive index and are in good agreement with the calculated dual grating response to resonances in the microscopic susceptibility due to intersystem crossing and spin-lattice relaxation.

Optics Letters•Feb 1, 1992•14 citations

The effect of pressure ( P ) on the intrinsic optical dynamics of nitrogen-vacancy NV - colored centers in diamond: reexamining the intersystem crossing (ISC) with ΔSCF calculations within density functional theory (DFT) combined to the extended Hubbard model

Mariya Romanova, Jelena Sjakste, Michele Casula +1 more

Bulletin of the American Physical Society•Mar 2, 2020•0 citations
We study the decay kinetics of excited state of GR1 center in diamond using 633 nm pump pulse and 658 nm CW probe beam. The absorption saturation followed by a strong absorption of the probe below steady-state transmission level was observed. The recovery of the centers to the original level occurs slowly with ~500 ns time scale and reveals multi-exponential rates with no long-term bleaching or residual absorption. The branching ratio for relaxation process to the ground state and to the metastable state was estimated to be ~ 0.50.
We report on the spectroscopic characterization, absorption saturation, and excited-state dynamics of GR1 centers in synthetic diamonds. The non-linear optical measurements reveal an efficient bleaching of the GR1 center’s ground level under ns-pulsed 633 nm excitation. The maxima of absorption and emission cross sections were estimated to be 4.5 × 10−17 cm2 and 9 × 10−17 cm2 at 630 nm and 780 nm, respectively. The radiative lifetime of the excited level was estimated to be 8.5 ns. The 658 nm probe kinetics uncovered relaxation of 1T2 excited level going predominantly to a metastable state with a lifetime of 220 μs. An induced absorption detected with the use of a highly concentrated diamond sample could be due to up-conversion and photoionization processes in additional impurity-vacancy center with absorption at the short-wavelength tail of GR1. The results presented here indicate that synthetic diamonds with GR1 centers could serve as near infrared gain media or passive Q-switchers for laser cavities over the 633–750 nm spectral range. Optimization of the center concentration and the crystal parameters are required to minimize the induced absorption at the lasing wavelengths.