Raman spectroscopy of lithium niobate (LiNbO3) − Sample temperature and laser spot size effects
The Raman spectrum of lithium niobate (LiNbO3) was investigated in the 83–823 K temperature range and as a function of different laser spot sizes. The measurements considered a Z-cut (congruent, undoped) LiNbO3 crystal, HeNe laser excitation (632.8 nm photons), and the zx,xyz¯ geometry. The main LiN...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-04-01
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| Series: | Results in Physics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379723001730 |
| _version_ | 1797851967174737920 |
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| author | A.R. Zanatta |
| author_facet | A.R. Zanatta |
| author_sort | A.R. Zanatta |
| collection | DOAJ |
| description | The Raman spectrum of lithium niobate (LiNbO3) was investigated in the 83–823 K temperature range and as a function of different laser spot sizes. The measurements considered a Z-cut (congruent, undoped) LiNbO3 crystal, HeNe laser excitation (632.8 nm photons), and the zx,xyz¯ geometry. The main LiNbO3-related phonon modes were identified and analyzed in terms of their peak position (ω) and linewidth (γ), according to which it was possible to identify the contributions originating from anharmonic phonon-coupling and thermal lattice-expansion processes. The analyses of the temperature-dependent ωT and γT data took into account the 3- and 4-phonon model and the experimental Grüneisen and linear thermal expansion coefficients − as available from literature. Among all phonon modes of LiNbO3, the A1(TO4) mode presented a peculiar behavior (at room temperature) that depends on the laser spot size during the Raman measurements. The development of this forbidden mode has been associated with the congruent-photorefractive nature of LiNbO3 as well as with small variations in the geometry of polarization (as a result of changes in the laser spot size). |
| first_indexed | 2024-04-09T19:25:19Z |
| format | Article |
| id | doaj.art-301ae302fe514ac58f0e097a8679be18 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-04-09T19:25:19Z |
| publishDate | 2023-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-301ae302fe514ac58f0e097a8679be182023-04-05T08:13:43ZengElsevierResults in Physics2211-37972023-04-0147106380Raman spectroscopy of lithium niobate (LiNbO3) − Sample temperature and laser spot size effectsA.R. Zanatta0Instituto de Física de São Carlos, USP, São Carlos 13560-970 − SP, BrazilThe Raman spectrum of lithium niobate (LiNbO3) was investigated in the 83–823 K temperature range and as a function of different laser spot sizes. The measurements considered a Z-cut (congruent, undoped) LiNbO3 crystal, HeNe laser excitation (632.8 nm photons), and the zx,xyz¯ geometry. The main LiNbO3-related phonon modes were identified and analyzed in terms of their peak position (ω) and linewidth (γ), according to which it was possible to identify the contributions originating from anharmonic phonon-coupling and thermal lattice-expansion processes. The analyses of the temperature-dependent ωT and γT data took into account the 3- and 4-phonon model and the experimental Grüneisen and linear thermal expansion coefficients − as available from literature. Among all phonon modes of LiNbO3, the A1(TO4) mode presented a peculiar behavior (at room temperature) that depends on the laser spot size during the Raman measurements. The development of this forbidden mode has been associated with the congruent-photorefractive nature of LiNbO3 as well as with small variations in the geometry of polarization (as a result of changes in the laser spot size).http://www.sciencedirect.com/science/article/pii/S2211379723001730Lithium niobate (LiNbO3)Raman scatteringPhonon couplingTemperature-dependence |
| spellingShingle | A.R. Zanatta Raman spectroscopy of lithium niobate (LiNbO3) − Sample temperature and laser spot size effects Results in Physics Lithium niobate (LiNbO3) Raman scattering Phonon coupling Temperature-dependence |
| title | Raman spectroscopy of lithium niobate (LiNbO3) − Sample temperature and laser spot size effects |
| title_full | Raman spectroscopy of lithium niobate (LiNbO3) − Sample temperature and laser spot size effects |
| title_fullStr | Raman spectroscopy of lithium niobate (LiNbO3) − Sample temperature and laser spot size effects |
| title_full_unstemmed | Raman spectroscopy of lithium niobate (LiNbO3) − Sample temperature and laser spot size effects |
| title_short | Raman spectroscopy of lithium niobate (LiNbO3) − Sample temperature and laser spot size effects |
| title_sort | raman spectroscopy of lithium niobate linbo3 sample temperature and laser spot size effects |
| topic | Lithium niobate (LiNbO3) Raman scattering Phonon coupling Temperature-dependence |
| url | http://www.sciencedirect.com/science/article/pii/S2211379723001730 |
| work_keys_str_mv | AT arzanatta ramanspectroscopyoflithiumniobatelinbo3sampletemperatureandlaserspotsizeeffects |