Polarization-dependent near-IR ultrashort-pulse laser ablation of natural diamond surfaces

Krasin, George; Kovalev, M. S.; Kudryashov, S. I.; Данилов, П. А.; Мартовицкий, В. П.; Gritsenko, I. V.; Podlesnykh, Ivan; Хмельницкий, Р. А.; Kuzmin, Evgeny V.; Gulina, Yulia; Левченко, А. В.

doi:10.1016/j.apsusc.2022.153549

Cited by 7 publications

(3 citation statements)

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“…High-order non-linearities are known to be related to multi-photon absorption (imaginary parts) and the generation of higher harmonics or wave-mixing (real parts), while low-order non-linearities emerge as laser beam Kerr self-focusing and filamentation (upstream non-linear focus), once the peak pulse power exceeds the critical one [ 36 ]. Critical powers for self-focusing on non-linear media are known to be wavelength-, polarization-, and even beam shape-dependent [ 36 , 37 , 38 ], while in diamonds the intra-gap OCs could function as intermediate resonances, enhancing such optical non-linearities [ 72 ].…”

Section: Basic Physical Processes Of Ultrashort Pulse Laser-diamond I...mentioning

confidence: 99%

“… ( a ) Brillouin zone of a diamond and its main directions; ( b ) Polar plot of single-shot 1030 nm, 300 fs-laser ablation thresholds for the 100-facet diamond surface as a function of polarization angle; The pink dashed pattern denotes the direct bandgap variation in diamond; ( c ) Polar plot of bulk PL yield collected in natural diamond in the [ 110 ] direction and excited by linearly polarized 1030 nm and 300 fs-laser pulses focused inside it along the 110 axis; ( d ) polar plot of the threshold energy of filamentation onset in natural diamond for linearly polarized 1030 nm and 300 fs-laser pulse focused inside it along the [ 110 ] axis. Adapted from [ 37 ]. …”

Section: Figurementioning

confidence: 99%

“…First, in bulk transparent dielectric materials, high-power ultrashort laser pulses could propagate non-linearly, with polarization-, wavelength-, and pulsewidth-dependent χ ʒ -type Kerr self-focusing in the pre-focal region [ 36 ], as illustrated below in Section 2 . Higher-order non-linearities χ n in bulk dielectrics, responsible, e.g., for multi-photon EHP generation, could be also polarization-, wavelength-, and pulsewidth-dependent [ 36 , 37 , 38 ], while many dielectrics are yet unexplored. Furthermore, in natural diamonds with high OC concentrations (~10–10 3 ppm), the strong enhancement of optical non-linearities could be expected due to presence of intra-gap intermediate states, positively adding to the high linear refractive index of the material (≈2.4) during self-focusing and filamentation against the negative EHP contribution, but key self-focusing parameters in diamonds are OC concentration-dependent and thus very controversial.…”

Section: Introductionmentioning

confidence: 99%

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“Stealth Scripts”: Ultrashort Pulse Laser Luminescent Microscale Encoding of Bulk Diamonds via Ultrafast Multi-Scale Atomistic Structural Transformations

et al. 2023

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The ultrashort-laser photoexcitation and structural modification of buried atomistic optical impurity centers in crystalline diamonds are the key enabling processes in the fabrication of ultrasensitive robust spectroscopic probes of electrical, magnetic, stress, temperature fields, and single-photon nanophotonic devices, as well as in “stealth” luminescent nano/microscale encoding in natural diamonds for their commercial tracing. Despite recent remarkable advances in ultrashort-laser predetermined generation of primitive optical centers in diamonds even on the single-center level, the underlying multi-scale basic processes, rather similar to other semiconductors and dielectrics, are almost uncovered due to the multitude of the involved multi-scale ultrafast and spatially inhomogeneous optical, electronic, thermal, and structural elementary events. We enlighten non-linear wavelength-, polarization-, intensity-, pulsewidth-, and focusing-dependent photoexcitation and energy deposition mechanisms in diamonds, coupled to the propagation of ultrashort laser pulses and ultrafast off-focus energy transport by electron–hole plasma, transient plasma- and hot-phonon-induced stress generation and the resulting variety of diverse structural atomistic modifications in the diamond lattice. Our findings pave the way for new forthcoming groundbreaking experiments and comprehensive enlightening two-temperature and/or atomistic modeling both in diamonds and other semiconductor/dielectric materials, as well as innovative technological breakthroughs in the field of single-photon source fabrication and “stealth” luminescent nano/microencoding in bulk diamonds for their commercial tracing.

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