Laser spectroscopic and saturation properties of GR1 centers in synthetic diamond

Shova Subedi; Vladimir Fedorov; Sergey Mirov; Matthew Markham

doi:10.1117/12.2546934

21 February 2020 Laser spectroscopic and saturation properties of GR1 centers in synthetic diamond

Shova Subedi, Vladimir Fedorov, Sergey Mirov, Matthew Markham

Proceedings Volume 11259, Solid State Lasers XXIX: Technology and Devices; 1125928 (2020) https://doi.org/10.1117/12.2546934
Event: SPIE LASE, 2020, San Francisco, California, United States

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.

Citation Download Citation

Shova Subedi, Vladimir Fedorov, Sergey Mirov, and Matthew Markham "Laser spectroscopic and saturation properties of GR1 centers in synthetic diamond", Proc. SPIE 11259, Solid State Lasers XXIX: Technology and Devices, 1125928 (21 February 2020); https://doi.org/10.1117/12.2546934

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available