In summary, the generation of NV centers in synthetic bulk
diamond was investigated using high-fluence and large-spot femtosecond laser pulses. NV centers were effectively created by singlepulse irradiation. Two focused-spot shapes, circular and linear, were
investigated; the latter may be useful to create NV centers rapidly
over a large region without post-annealing by line scanning. The
size of the created region was expanded for a higher laser fluence,
probably due to laser–diamond surface and laser–air interactions.
Furthermore, the NV center creation over a millimeter-sized spot
was demonstrated by a large defocused spot in a vacuum condition.
We expect that a raster scanning of the defocused spot with a suitable mask generates NV centers over a centimeter-sized region in a
short time. The spin-echo and FID signals showed that P1 centers
restricted the length of T 2 and T 2 ∗ for the irradiated region, and
single-pulse laser ablation had little influence on T 2 and T 2 ∗ .
The three-dimensional (3D) formation of high-dense NV centers will be the next step to realize the high-sensitive quantum sensor
by laser irradiation. So far, NV center formation over a large region
has been limited to a few methods, such as electron irradiation and
chemical vapor deposition. The present study showed that the laser
scanning of a linear spot might realize the rapid creation of NV centers in a 3D region. The ultrashort laser irradiation method may
pave the way for a new approach to creating NV centers over a wide
region.
ACKNOWLEDGMENTS
The authors are grateful for financial support from the
(MEXT)-QLEAP project (Grant No. JPMXS0118070187), a Kakenhi
Grant-in-Aid (Grant No. 21H04653), and partial support from the
(MEXT)-QLEAP project (Grant No. JPMXS0118067395).
AUTHOR DECLARATIONS
Conflict of Interest
The authors have no conflicts to disclose.
Author Contributions
Masanori Fujiwara: Formal analysis (equal); Investigation (equal);
Writing – original draft (equal). Shunsuke Inoue: Data curation
(equal); Formal analysis (equal); Investigation (equal). Shin-ichiro
Masuno: Formal analysis (supporting); Investigation (supporting).
Haining Fu: Investigation (supporting). Shigeki Tokita: Project
administration (supporting); Resources (equal). Masaki Hashida:
Formal analysis (equal); Investigation (supporting); Methodology
(equal); Validation (equal); Writing – original draft (supporting).
Norikazu Mizuochi1: Funding acquisition (equal); Project administration (equal); Supervision (lead); Writing – review & editing
(lead).
DATA AVAILABILITY
The data that support the findings of this study are available
from the corresponding author upon reasonable request.
APL Photon. 8, 036108 (2023); doi: 10.1063/5.0137093
© Author(s) 2023
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