Erforschung der Kristallzüchtung des neuen, wide-bandgap, nichtlinearen Nichtoxidkristalls BaGa4S7 und seine Anwendung in optisch-parametrischen Verstärkern

• Antragsteller: Valentin Petrov, Ph.D.
• Fachliche Zuordnung: Experimentelle Physik der kondensierten Materie ; Herstellung und Eigenschaften von Funktionsmaterialien ; Optik, Quantenoptik und Physik der Atome, Moleküle und Plasmen
• Förderung: Förderung von 2018 bis 2022
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 392070342

• Erstellungsjahr: 2023

Zusammenfassung der Projektergebnisse

Dieses Projekt war einem Vertreter der neu entwickelten Klasse von Barium enthaltenden, nichtlinearen Chalkogenid-Kristallen, welche keine Chalkopyrit Symmetrie aufweisen, gewidmet. Diese Kristalle sind speziell für Anwendungen im mittleren Infrarot (mid-IR) Spektralbereich geeignet. Die Hauptaktivitäten umfassten die Charakterisierung relevanter Eigenschaften sowie die Demonstration spezifischer Vorteile bei der parametrischen Frequenzkonversion von Laserquellen, die im 1-µm Spektralbereich emittieren, in den mid-IR Bereich oberhalb 5 µm. Zu den charakterisierten Eigenschaften gehören Transparenz und Bandlücke, Brechzahl und Doppelbrechung als Funktion von Wellenlänge und Temperatur, Komponenten des Suszeptibilitätstensors zweiter Ordnung mit ihren relativen Vorzeichen, thermomechanische Eigenschaften wie Härte, E-Modul, anisotrope Wärmeausdehnung und Wärmeleitfähigkeit, und nichtlinearer Brechungsindex. Auf der Grundlage realisierter Dreiwellen-Mischprozesse wurden Sellmeier-Gleichungen und thermooptische Beziehungen gefittet, um die Phasenanpassungseigenschaften besser zu beschreiben. Interessante Konfigurationen für unkritische 90°-Phasenanpassung und breitbandige parametrische Verstärkung wurden identifiziert. Es wurden spezielle Ansätze entwickelt, um die relativen Vorzeichen der nichtlinearen Koeffizienten in Kristallen mit niedriger Symmetrie zu bestimmen, die für eine reproduzierbare Orientierung wesentlich sind. Damit wurde eine maximierte effektive Nichtlinearität für einen gegebenen parametrischen Prozess sichergestellt. BaGa4S7 wurde zum ersten Mal in einem optischen parametrischen Femtosekundenverstärker bei 100 kHz Folgefrequenz eingesetzt, der von einem Weißlichtkontinuum geseedet und von einem Yb-basierten Lasersystem bei 1028 nm gepumpt wurde. Phasenstabile sub-4-Zyklen Impulse wurden direkt bei 10 µm erzeugt, wobei von den herausragenden dispersiven Eigenschaften dieses nichtlinearen Kristalls für diesen parametrischen Prozess profitiert wurde. Um eine hohe Einzelimpulsenergie im Nanosekundenbereich zu erreichen, wurde ein origineller kaskadierter optisch-parametrischer Oszillator mit Intracavity-Pumpen der zweiten Stufe verwendet. Dieser basierte auf einem Nd-Lasersystem bei 1 µm Wellenlänge und 100 Hz Folgefrequenz. Maximale Energien über 1 mJ bei einer Impulsdauer von 10 ns wurden in einem Abstimmbereich von 6.62 bis 11.34 µm erzielt. Schmalbandiger Laserbetrieb wurde durch Typ- 2-Phasenanpassung und ein Volumen-Bragg-Gitter erreicht. Die vielfältige Publikation der Ergebnisse im Projekt trug wesentlich dazu bei, die Sichtbarkeit dieser neuen Klasse von Nichtoxidkristallen für deren Anwendung in der nichtlinearen Frequenzkonversion im mid-IR zu erhöhen. Die untersuchten neuartigen Kristalle sind im Wesentlichen frei von den technologischen Problemen mit denen die bekannten Chalkopyriten behaftet sind, wie chemische Instabilität und das Erfordernis des Temperns nach dem Wachstum. Damit sind diese Kristalle attraktiv für eine zukünftige Kommerzialisierung.

Projektbezogene Publikationen (Auswahl)

• "Laser-induced damage of nonlinear crystals in ultrafast, high-repetition-rate, mid-infrared optical parametric amplifiers pumped at 1 μm,” 2019 Pacific Rim Laser Damage & Thin Film Physics and Applications, Qingdao, China, May 19-22, 2019, invited paper WED 08:20. PLD & TFPA 2019 Advance Program.
  M. Mero; Z. Heiner & V. Petrov
  
• Broadband vibrational sum-frequency generation spectrometer at 100 kHz in the 950-1750 cm−1 spectral range utilizing a LiGaS2 optical parametric amplifier. Optics Express, 27(11), 15289.
  Heiner, Zsuzsanna; Wang, Li; Petrov, Valentin & Mero, Mark
  
• Crystal Growth and Characterization of a New Quaternary Chalcogenide Nonlinear Crystal for the Mid-Infrared: PbGa2GeSe6. Crystal Growth & Design, 19(8), 4224-4228.
  Badikov, Valeriy V.; Badikov, Dmitrii V.; Wang, Li; Shevyrdyaeva, Galina S.; Panyutin, Vladimir L.; Fintisova, Anna A.; Sheina, Svetlana G. & Petrov, Valentin
  
• Frequency Down-Conversion of 1 µm Laser Radiation to the Mid-IR using Non-Oxide Nonlinear Crystals in Cascaded Intracavity Configurations. International Photonics and OptoElectronics Meeting 2019 (OFDA, OEDI, ISST, PE, LST, TSA) (2019), LTh3E.2. American Geophysical Union (AGU).
  Petrov, Valentin; Boyko, Andrey; Badikov, Valeriy; Pasiskevicius, Valdas; Kostyukova, Nadezhda; Kolker, Dmitry; Badikov, Dmitrii; Shevyrdyaeva, Galina; Wang, Li; Chen, Weidong & Panyutin, Vladimir
  
• Growth and Characterization of PbGa2GeSе6: A New Quaternary Chalcogenide Nonlinear Crystal for the Mid-IR. Conference on Lasers and Electro-Optics (2019), SF3O.8. American Geophysical Union (AGU).
  Badikov, Valeriy V.; Badikov, Dmitrii V.; Wang, Li; Shevyrdyaeva, Galina S.; Panyutin, Vladimir L.; Fintisova, Anna A.; Sheina, Svetlana G. & Petrov, Valentin
  
• Laser-induced damage of nonlinear crystals in ultrafast, high-repetition-rate, mid-infrared optical parametric amplifiers pumped at 1 µm. Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers (2019, 7, 8), 58. American Geophysical Union (AGU).
  Mero, Mark; Wang, Li; Chen, Weidong; Ye, Ning; Zhang, Ge; Petrov, Valentin & Heiner, Zsuzsanna
  
• Narrow-band periodically poled lithium niobate nonresonant optical parametric oscillator. Optics Letters, 44(23), 5659.
  Wang, Li; Boyko, Andrey A.; Schirrmacher, André; Büttner, Edlef; Chen, Weidong; Ye, Ning & Petrov, Valentin
  
• Thermo-optic dispersion formula for BaGa2GeSe6. Applied Optics, 58(35), 9709.
  Kato, Kiyoshi; Miyata, Kentaro; Okamoto, Takayuki; Badikov, Valeriy V. & Petrov, Valentin
  
• Thermo-optic dispersion formula for LiGaS2. Applied Optics, 58(6), 1519.
  Kato, Kiyoshi; Umemura, Nobuhiro; Isaenko, Ludmila; Lobanov, Sergei; Vedenyapin, Vitaliy; Miyata, Kentaro & Petrov, Valentin
  
• ”Few-cycle mid-IR pulses by DFG in BaGa2GeSe6,” Ultrafast Optics UFO XII, Bol, Croatia, Oct. 6-11, 2019, Full Online Program, Poster Session 2, paper P.2.19.
  L. Maidment; U. Elu; L. Vamos; T. Steinle; F. Haberstroh; V. Badikov; D. Badikov; V. Petrov & J. Biegert
  
• "Few-cycle mid-infrared pulses from BaGa2GeSe6,” Europhoton 2020, 9th EPS-QEOD Europhoton Virtual Conference on Solid-State, Fibre and Waveguide Coherent Light Sources, Aug. 30 - Sep. 4, 2020, paper We-A1.3, Online Digest.
  U. Elu; L. Maidment; L. Vamos; T. Steinle; F. Haberstroh; V. Petrov; V. Badikov; D. Badikov & J. Biegert
  
• "Narrow-band non-resonant optical parametric oscillator,” Photonics West’20: LASE 2020, SPIE Conference 11264: "Nonlinear Frequency Generation and Conversion: Materials and Devices XIX,” San Francisco (CA), USA, Feb. 1 - 6, 2020, paper [11264-13], Technical Program, p. 301.
  L. Wang; A. A. Boyko; A. Schirrmacher; E. Büttner; N. Ye; G. Zhang; W. Chen & V. Petrov
  
• "Progress in ultrafast mid-infrared optical parametric chirped pulse amplifiers pumped at 1μm,” Photonics West’20: LASE 2020, SPIE Conference 11264: "Nonlinear Frequency Generation and Conversion: Materials and Devices XIX,” San Francisco (CA), USA, Feb. 1 - 6, 2020, invited paper [11264-14], Technical Program, p. 302.
  M. Mero; Z. Heiner & V. Petrov
  
• Barium Nonlinear Optical Crystals for the Mid-IR: Characterization and Applications. OSA High-brightness Sources and Light-driven Interactions Congress 2020 (EUVXRAY, HILAS, MICS) (2020), MTu1C.6. American Geophysical Union (AGU).
  Petrov, Valentin; Badikov, Valeriy V.; Badikov, Dmitrii V.; Shevyrdyaeva, Galina S.; Kato, Kiyoshi; Miyata, Kentaro; Mitin, Konstantin V.; Wang, Li & Panyutin, Vladimir
  
• Determination of Sellmeier’s equations and nonlinear coefficients of the BGSe crystal, and calculation of infrared emission from phase-matched optical parametric generation (Conference Presentation). Nonlinear Frequency Generation and Conversion: Materials and Devices XIX (2020, 3, 9), 28. American Geophysical Union (AGU).
  Boulanger, Benoit; Guo, Feng; Segonds, Patricia; Boursier, Elodie; Debray, Jérôme; Badikov, Valeriy; Badikov, Dmitri; Panyutin, Vladimir & Petrov, Valentin
  
• Effective Nonlinearity of BaGa2GeSe6: A Promising Quaternary Chalcogenide Crystal for the Mid-IR. Conference on Lasers and Electro-Optics (2020), SF3R.2. American Geophysical Union (AGU).
  Kato, Kiyoshi; Badikov, Valeriy V.; Wang, Li; Panyutin, Vladimir L.; Mitin, Konstantin V.; Miyata, Kentaro & Petrov, Valentin
  
• Effective nonlinearity of the new quaternary chalcogenide crystal BaGa2GeSe6. Optics Letters, 45(8), 2136.
  Kato, Kiyoshi; Badikov, Valeriy V.; Wang, Li; Panyutin, Vladimir L.; Mitin, Konstantin V.; Miyata, Kentaro & Petrov, Valentin
  
• Effective Nonlinearity of Trigonal Crystals of Symmetry Class 3 on the Example of the Non-Oxide BaGa2GeSе6. OSA High-brightness Sources and Light-driven Interactions Congress 2020 (EUVXRAY, HILAS, MICS) (2020), MTu1C.4. American Geophysical Union (AGU).
  Miyata, Kentaro; Kato, Kiyoshi; Badikov, Valeriy V.; Panyutin, Vladimir L.; Wang, Li; Mitin, Konstantin V. & Petrov, Valentin
  
• Efficient, sub-4-cycle, 1-µm-pumped optical parametric amplifier at 10  µm based on BaGa4S7. Optics Letters, 45(20), 5692.
  Heiner, Zsuzsanna; Petrov, Valentin & Mero, Mark
  
• Few-cycle mid-infrared pulses from BaGa2GeSe6. Optics Letters, 45(13), 3813.
  Elu, Ugaitz; Maidment, Luke; Vamos, Lenard; Steinle, Tobias; Haberstroh, Florian; Petrov, Valentin; Badikov, Valeriy; Badikov, Dmitrii & Biegert, Jens
  
• Intracavity Mid-IR Difference-Frequency Generation in OP-GaAs inside a Nanosecond Optical Parametric Oscillator. OSA High-brightness Sources and Light-driven Interactions Congress 2020 (EUVXRAY, HILAS, MICS) (2020), MM1C.6. American Geophysical Union (AGU).
  Wang, Li; Chen, Weidong; Schunemann, Peter; Schirrmacher, André; Büttner, Edlef; Guha, Shekhar; Boyko, Andrey A.; Ye, Ning; Zhang, Ge; Zhao, Yongguang & Petrov, Valentin
  
• Phase-matching properties of LiIn(SxSe1-x) for THG of a CO2 laser at 10.5910 μm. Nonlinear Frequency Generation and Conversion: Materials and Devices XIX (2020, 3, 2), 69. American Geophysical Union (AGU).
  Kato, Kiyoshi; Petrov, Valentin & Miyata, Kentaro
  
• Progress in ultrafast, mid-infrared optical parametric chirped pulse amplifiers pumped at 1 µm. Nonlinear Frequency Generation and Conversion: Materials and Devices XIX (2020, 3, 2), 14. American Geophysical Union (AGU).
  Mero, Mark; Petrov, Valentin & Heiner, Zsuzsanna
  
• Seven-octave high-brightness and carrier-envelope-phase-stable light source. Nature Photonics, 15(4), 277-280.
  Elu, Ugaitz; Maidment, Luke; Vamos, Lenard; Tani, Francesco; Novoa, David; Frosz, Michael H.; Badikov, Valeriy; Badikov, Dmitrii; Petrov, Valentin; St., J. Russell Philip & Biegert, Jens
  
• Toward 100 W average power few-cycle optical parametric amplifiers in the midinfrared,” Photonics North 2020, Virtual Event, May 26 - 28, 2020, invited paper HP-4-27-1, Conference Program
  M. Mero, V. Petrov, Z. Heiner
  
• Tunable Narrow-Band PPLN Non-Resonant Optical Parametric Oscillator. Laser Congress 2020 (ASSL, LAC) (2020), JTh6A.8. American Geophysical Union (AGU).
  Wang, Li; Chen, Weidong; Schirrmacher, André; Büttner, Edlef; Boyko, Andrey A.; Ye, Ning; Zhang, Ge & Petrov, Valentin
  
• ”A highaverage-power, 1.5/3.2-μm OPCPA driver for a high-flux soft X-ray beamline and attosecond strongfield spectroscopy,” 19th International Conference Laser Optics ICLO 2020, St. Petersburg, Russia, Nov. 2 - 6, invited paper TuR1-15, Technical Program
  M. Mero, Z. Heiner, V. Petrov, H. Rottke, F. Branchi, J. Mikosch, G. M. Thomas, M. J. J. Vrakking
  
• ”Performance comparison of LiGaS2 and BaGa4S7 in a few-cycle mid-infrared OPA,” Photonics North 2020, Virtual Event, May 26 - 28, 2020, paper HP-6-28-2, Conference Program
  Z. Heiner, V. Petrov, M. Mero
  
• "Few-cycle mid-IR pulses by DFG in BaGa2GeSe6,” Proc. SPIE 11370(2021) 1137001/415-418.
  L. Maidment; U. Elu; L. Vamos; T. Steinle; F. Haberstroh; V. Badikov; V. Petrov & J. Biegert
  
• "Multi-branch, 1-µm-pumped, few-cycle mid-IR OPA system for nonlinear vibrational spectroscopy,” Conference on Lasers and Electro-Optics CLEO'21, Virtual Conference, May 10-14, 2021, invited paper STh2L.3, CLEO Online Interactive Online Schedule
  Z. Heiner, S. Krekic, V. Petrov, M. Mero
  
• 340 - 40,000 nm coherent light source. 2021 IEEE Photonics Conference (IPC) (2021, 10), 1-2. American Geophysical Union (AGU).
  Elu, Ugaitz; Maidment, Luke; Vamos, Lenard; Tani, Francesco; Novoa, David; Frosz, Michael H.; Badikov, Valeriy; Badikov, Dmitrii; Petrov, Valentin; Russell, Philip St. J. & Biegert, Jens
  
• Accurate Sellmeier equations for AgGaS2 in the 0.565-10.6321 μm spectral range. Nonlinear Frequency Generation and Conversion: Materials and Devices XX (2021, 3, 5), 54. American Geophysical Union (AGU).
  Kato, Kiyoshi; Petrov, Valentin & Miyata, Kentaro
  
• Barium nonlinear optical crystals for the mid-IR: characterization and some applications. Journal of the Optical Society of America B, 38(8), B46.
  Petrov, Valentin; Badikov, Valeriy V.; Badikov, Dmitrii V.; Kato, Kiyoshi; Shevyrdyaeva, Galina S.; Miyata, Kentaro; Mero, Mark; Wang, Li; Heiner, Zsuzsanna & Panyutin, Vladimir L.
  
• Extreme temporal compression of ultra-broadband mid-infrared pulses. Light Filaments: Structures, challenges and applications (2021, 12, 22), 103-115. American Geophysical Union (AGU).
  Elu, Ugaitz; Maidment, Luke; Vamos, Lenard; Tani, Francesco; Novoa, David; Frosz, Michael H.; Badikov, Valeriy; Badikov, Dmitrii; Petrov, Valentin; St., J. Russell Philip & Biegert, Jens
  
• Few-cycle, µJ-level pulses beyond 5 µm from 1-µm-pumped OPA's based on non-oxide nonlinear crystals. Nonlinear Frequency Generation and Conversion: Materials and Devices XX (2021, 3, 5), 30. American Geophysical Union (AGU).
  Heiner, Zsuzsanna; Petrov, Valentin & Mero, Mark
  
• High-Power, Narrow-Band PPLN Non-Resonant Optical Parametric Oscillator. Conference on Lasers and Electro-Optics (2021), JTu3A.113. American Geophysical Union (AGU).
  Wang, Li; Chen, Weidong; Schirrmacher, André; Büttner, Edlef; Boyko, Andrey A.; Ye, Ning; Zhang, Ge & Petrov, Valentin
  
• Mid-IR difference-frequency generation in OP-GaAs inside the cavity of a narrow-band nanosecond PPLN optical parametric oscillator. Nonlinear Frequency Generation and Conversion: Materials and Devices XX (2021, 3, 5), 35. American Geophysical Union (AGU).
  Wang, Li; Chen, Weidong; Zhao, Yongguang; Schunemann, Peter; Schirrmacher, Andre; Büttner, Edlef; Boyko, Andrey; Ye, Ning; Zhang, Ge & Petrov, Valentin
  
• Nanosecond optical parametric oscillator with midinfrared intracavity difference-frequency mixing in orientation-patterned GaAs. Optics Letters, 46(2), 332.
  Wang, Li; Chen, Weidong; Schunemann, Peter; Schirrmacher, André; Büttner, Edlef; Boyko, Andrey A.; Ye, Ning; Zhang, Ge; Zhao, Yongguang & Petrov, Valentin
  
• Refined Sellmeier equations for AgGaSe2 up to 18  µm. Applied Optics, 60(4), 805.
  Kato, Kiyoshi; Miyata, Kentaro & Petrov, Valentin
  
• Refined Sellmeier equations for BaGa4S7. Applied Optics, 60(22), 6600.
  Kato, Kiyoshi; Badikov, Valeriy V.; Miyata, Kentaro & Petrov, Valentin
  
• Seven-octave Ultra-bright Pulse Generation. OSA Nonlinear Optics 2021 (2021), NTh1B.3. American Geophysical Union (AGU).
  Enders, Michael T.; Elu, Ugaitz; Maidment, Luke; Vamos, Lenard; Tani, Francesco; Novoa, David; Frosz, Michael H.; Badikov, Valeriy; Badikov, Dimitrii; Petrov, Valentin; Russell, Philip St. J. & Biegert, Jens
  
• Temperature-Tuned Parametric Oscillation in CdSe. Laser Congress 2021 (ASSL,LAC) (2021), JTu1A.28. American Geophysical Union (AGU).
  Miyata, Kentaro; Kato, Kiyoshi; Wada, Satoshi & Petrov, Valentin
  
• Thermal Properties of the Trigonal Quaternary Nonlinear Crystals BaGa2GeS6 and BaGa2GeSe6. Conference on Lasers and Electro-Optics (2021), STu1C.4. American Geophysical Union (AGU).
  Wei, Jean; Murray, Joel; Badikov, Valeriy V.; Petrov, Valentin & Guha, Shekhar
  
• Updated Sellmeier equations for AgGaSe2 valid up to 18 micron. Nonlinear Frequency Generation and Conversion: Materials and Devices XX (2021, 3, 5), 53. American Geophysical Union (AGU).
  Kato, Kiyoshi; Petrov, Valentin & Miyata, Kentaro
  
• „High-brightness seven-octave light source,” CLEO/Europe-EQEC'21, June 21-25, 2021, Virtual Conference, paper CF-5.1, CLEO/Europe – EQEC 2021 Online Conference Digest
  U. Elu, L. Maidment, L. Vamos, F. Tani, D. Novoa, M. H. Frosz, V. Badikov, D. Badikov, V. Petrov, P. St. J. Russell, J. Biegert
  
• „Non-resonant PPLN optical parametric oscillator in the narrow-band regime,” 28th Annual International Conference on Advanced Laser Technologies, ALT'21, Virtual Conference, Moscow, Russia, Sep. 6-10, 2021, invited paper LS-I-8, Book of Abstracts
  L. Wang, W. Chen, V. Petrov
  
• "Heteroepitaxy of nonlinear optical materials for th frequency conversion based laser sources for mid-infrared operation,” 7 European Conference on Crystal Growth, ECCG7, July 25 - 27, 2022, Paris, France, Session 6, WED 11:40, Book of Abstract
  V. Tassev, S. Vangala, D. Brinegar, L. Wang, V. Petrov
  
• "Phase-matching properties for OPO in BaGa2GeS6,” th The 69 JSAP Spring Meeting, March 22 - 26, 2022, Tokyo, Japan, 24p-D215-7
  N. Umemura, V. Badikov, T. Kinoshita, K. Kato, V. Petrov
  
• 7-octave high-brightness CEP-stable light source. Conference on Lasers and Electro-Optics (2022), SF4H.2. American Geophysical Union (AGU).
  Elu, U.; Maidment, L.; Vamos, L.; Tani, F.; Novoa, D.; Frosz, M. H.; Badikov, V.; Badikov, D.; Petrov, V.; Russell, P. St. J. & Biegert, J.
  
• Crystal growth and characterization of a new quaternary hexagonal nonlinear crystal for the mid-IR: Ba2Ga8GeS16. Journal of Alloys and Compounds, 907, 164378.
  Badikov, Valeriy V.; Badikov, Dmitrii V.; Shevyrdyaeva, Galina S.; Kato, Kiyoshi; Umemura, Nobuhiro; Miyata, Kentaro; Panyutin, Vladimir L. & Petrov, Valentin
  
• Frequency Conversion Characteristics of Hexagonal Ba2Ga8GeS16. Optica Advanced Photonics Congress 2022 (2022), AM6A.4. American Geophysical Union (AGU).
  Miyata, Kentaro; Kato, Kiyoshi; Badikov, Valeriy; Umemura, Nobuhiro & Petrov, Valentin
  
• Hardness and Young's modulus of BaGa4S7 and BaGa4Se7 nonlinear optical crystals. Optical Materials, 133 (2022, 11), 112994.
  Exner, Ginka; Grigorov, Aleksandar; Badikov, Valeriy & Petrov, Valentin
  
• Hardness and Young’s Modulus Measurements of the Nonlinear Optical Crystals BaGa2GeS6 and BaGa2GeSe6. Optica Advanced Photonics Congress 2022 (2022), JW3B.10. American Geophysical Union (AGU).
  Exner, Ginka; Grigorov, Aleksandar; Badikov, Valeriy & Petrov, Valentin
  
• Heteroepitaxial Growth of Mixed OP-GaAsP Periodic Structures and Second-Harmonic Generation. Conference on Lasers and Electro-Optics (2022), SF3P.3. American Geophysical Union (AGU).
  Wang, Li; Vangala, Shivashankar R.; Popien, Stefan; Beutler, Marcus; Tassev, Vladimir L. & Petrov, Valentin
  
• High brightness 7-octave-spanning coherent light source. Optica Advanced Photonics Congress 2022 (2022), ATu4A.1. American Geophysical Union (AGU).
  Elu, Ugaitz; Maidment, Luke; Vamos, Lenard; Poborska, Julita; Tyulnev, Igor; Tani, Francesco; Novoa, David; Frosz, Michael H.; Badikov, Valeriy; Badikov, Dmitrii; Petrov, Valentin; Russell, Philip St. J. & Biegert, Jens
  
• High-energy, narrowband, non-resonant PPKTP optical parametric oscillator. Nonlinear Frequency Generation and Conversion: Materials and Devices XXI (2022, 3, 4), 54. American Geophysical Union (AGU).
  Boyko, Andrey A.; Wang, Li; Mhibik, Oussama; Divliansky, Ivan B.; Zukauskas, Andrius; Moelster, Kjell; Chen, Weidong; Glebov, Leonid B.; Pasiskevicius, Valdas & Petrov, Valentin
  
• Measurements of the Hardness and Young’s Modulus of the Nonlinear Optical Crystals BaGa4S7 and BaGa4Se7. Frontiers in Optics + Laser Science 2022 (FIO, LS) (2022), JTu4A.8. American Geophysical Union (AGU).
  Exner, Ginka; Grigorov, Aleksandar; Badikov, Valeriy & Petrov, Valentin
  
• Phase-matching properties of Ba2Ga8GeS16. Journal of the Optical Society of America B, 40(1), A17.
  Kato, Kiyoshi; Badikov, Valeriy V.; Umemura, Nobuhiro; Miyata, Kentaro & Petrov, Valentin
  
• Refined Sellmeier equations of CdGa2S4 for prediction of phase-matching in mixed Hg1-xCdxGa2S4 nonlinear crystals. Nonlinear Frequency Generation and Conversion: Materials and Devices XXI (2022, 3, 4), 14. American Geophysical Union (AGU).
  Kato, Kiyoshi; Mero, Mark; Heiner, Zsuzsanna; Kinoshita, Tomotsugu; Badikov, Valeriy V.; Miyata, Kentaro & Petrov, Valentin
  
• Second-order nonlinear optical coefficients of the monoclinic crystal BaGa4Se7. Optics Letters, 47(4), 842.
  Guo, Feng; Boursier, Elodie; Segonds, Patricia; Peña, Alexandra; Debray, Jerôme; Badikov, Valeriy; Panyutin, Vladimir; Badikov, Dmitrii; Petrov, Valentin & Boulanger, Benoît
  
• Second‐Harmonic Generation in Heteroepitaxially Grown, Orientation‐Patterned, Ternary GaAsP Periodic Structures. physica status solidi (RRL) – Rapid Research Letters, 16(11).
  Wang, Li; Vangala, Shivashankar R.; Popien, Stefan; Beutler, Marcus; Tassev, Vladimir L. & Petrov, Valentin
  
• Temperature-dependent phase-matching properties of BaGa2GeS6 in the 0.767–10.5910  µm spectral range. Applied Optics, 61(36), 10774.
  Kato, Kiyoshi; Umemura, Nobuhiro; Badikov, Valeriy V.; Badikov, Dmitrii V. & Petrov, Valentin
  
• Thermo-optic dispersion properties of CdSe for parametric nonlinear interactions. Optical Materials Express, 12(3), 963.
  Miyata, Kentaro; Kato, Kiyoshi; Wada, Satoshi & Petrov, Valentin
  
• Transmission and absorption measurements of GaAsP layers grown from the vapor phase. Nonlinear Frequency Generation and Conversion: Materials and Devices XXI (2022, 3, 4), 15. American Geophysical Union (AGU).
  Petrov, Valentin; Wang, Li; Vangala, Shivashankar R. & Tassev, Vladimir L.
  
• Narrowband seeding of a PPLN nonresonant optical parametric oscillator. Nonlinear Frequency Generation and Conversion: Materials and Devices XXII (2023, 3, 14), 23. American Geophysical Union (AGU).
  Murray, Robert T.; Wang, Li; Chen, Weidong; Battle, Ronan; Schirrmacher, Andre; Büttner, Edlef & Petrov, Valentin
  
• Sellmeier and thermo-optic dispersion formulas for BaGa2GeS6. Nonlinear Frequency Generation and Conversion: Materials and Devices XXII (2023, 3, 14), 35. American Geophysical Union (AGU).
  Kato, Kiyoshi; Umemura, Nobuhiro; Badikov, Valeriy V.; Badikov, Dmitry; Okamoto, Takayuki; Miyata, Kentaro & Petrov, Valentin