Intrapulse Correlated Dynamics of Self-Phase Modulation and Spontaneous Raman Scattering in Synthetic Diamond Excited and Probed by Positively Chirped Ultrashort Laser Pulses
In synthetic diamond plates, the intrapulse-correlated dynamics of self-phase modulation and spontaneous nonresonant Raman scattering by center-zone optical phonons were for the first time directly investigated for tightly focused (focusing numerical aperture NA = 0.25) positively chirped visible-ra...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-05-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/10/6/626 |
| _version_ | 1827735982527479808 |
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| author | Sergey Kudryashov Pavel Danilov Jiajun Chen |
| author_facet | Sergey Kudryashov Pavel Danilov Jiajun Chen |
| author_sort | Sergey Kudryashov |
| collection | DOAJ |
| description | In synthetic diamond plates, the intrapulse-correlated dynamics of self-phase modulation and spontaneous nonresonant Raman scattering by center-zone optical phonons were for the first time directly investigated for tightly focused (focusing numerical aperture NA = 0.25) positively chirped visible-range high-intensity laser pulses with variable durations (0.3–9.5 ps) and energies transmitted through the sample. The observed self-phase modulation broadening and modulation of the transmitted light and Stokes Raman spectra for the (sub)picosecond pulse durations indicate the considerable Raman–Kerr contribution to the nonlinear polarization. The latter appears through plasma emission of the optical phonons, which emerges on the (sub)picosecond timescale and dominates at ≈1 ps. Later, this phonon contribution is eventually suppressed in the material due to picosecond-scale electron-lattice thermalization and the related thermally enhanced symmetrical decay of optical phonons into lower-frequency acoustic ones. |
| first_indexed | 2024-03-11T02:02:28Z |
| format | Article |
| id | doaj.art-b96511963c90478887a48ecee2b6f243 |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-11T02:02:28Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-b96511963c90478887a48ecee2b6f2432023-11-18T12:07:28ZengMDPI AGPhotonics2304-67322023-05-0110662610.3390/photonics10060626Intrapulse Correlated Dynamics of Self-Phase Modulation and Spontaneous Raman Scattering in Synthetic Diamond Excited and Probed by Positively Chirped Ultrashort Laser PulsesSergey Kudryashov0Pavel Danilov1Jiajun Chen2P.N. Lebedev Physical Institute, 119991 Moscow, RussiaP.N. Lebedev Physical Institute, 119991 Moscow, RussiaP.N. Lebedev Physical Institute, 119991 Moscow, RussiaIn synthetic diamond plates, the intrapulse-correlated dynamics of self-phase modulation and spontaneous nonresonant Raman scattering by center-zone optical phonons were for the first time directly investigated for tightly focused (focusing numerical aperture NA = 0.25) positively chirped visible-range high-intensity laser pulses with variable durations (0.3–9.5 ps) and energies transmitted through the sample. The observed self-phase modulation broadening and modulation of the transmitted light and Stokes Raman spectra for the (sub)picosecond pulse durations indicate the considerable Raman–Kerr contribution to the nonlinear polarization. The latter appears through plasma emission of the optical phonons, which emerges on the (sub)picosecond timescale and dominates at ≈1 ps. Later, this phonon contribution is eventually suppressed in the material due to picosecond-scale electron-lattice thermalization and the related thermally enhanced symmetrical decay of optical phonons into lower-frequency acoustic ones.https://www.mdpi.com/2304-6732/10/6/626synthetic diamondultrashort laser pulsesself-phase modulationspontaneous Raman scatteringdelayed phonon-based Kerr nonlinearityelectron-phonon thermalization |
| spellingShingle | Sergey Kudryashov Pavel Danilov Jiajun Chen Intrapulse Correlated Dynamics of Self-Phase Modulation and Spontaneous Raman Scattering in Synthetic Diamond Excited and Probed by Positively Chirped Ultrashort Laser Pulses Photonics synthetic diamond ultrashort laser pulses self-phase modulation spontaneous Raman scattering delayed phonon-based Kerr nonlinearity electron-phonon thermalization |
| title | Intrapulse Correlated Dynamics of Self-Phase Modulation and Spontaneous Raman Scattering in Synthetic Diamond Excited and Probed by Positively Chirped Ultrashort Laser Pulses |
| title_full | Intrapulse Correlated Dynamics of Self-Phase Modulation and Spontaneous Raman Scattering in Synthetic Diamond Excited and Probed by Positively Chirped Ultrashort Laser Pulses |
| title_fullStr | Intrapulse Correlated Dynamics of Self-Phase Modulation and Spontaneous Raman Scattering in Synthetic Diamond Excited and Probed by Positively Chirped Ultrashort Laser Pulses |
| title_full_unstemmed | Intrapulse Correlated Dynamics of Self-Phase Modulation and Spontaneous Raman Scattering in Synthetic Diamond Excited and Probed by Positively Chirped Ultrashort Laser Pulses |
| title_short | Intrapulse Correlated Dynamics of Self-Phase Modulation and Spontaneous Raman Scattering in Synthetic Diamond Excited and Probed by Positively Chirped Ultrashort Laser Pulses |
| title_sort | intrapulse correlated dynamics of self phase modulation and spontaneous raman scattering in synthetic diamond excited and probed by positively chirped ultrashort laser pulses |
| topic | synthetic diamond ultrashort laser pulses self-phase modulation spontaneous Raman scattering delayed phonon-based Kerr nonlinearity electron-phonon thermalization |
| url | https://www.mdpi.com/2304-6732/10/6/626 |
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