Rabail Fatima, R. M. Arif Khalil, Muhammad Iqbal Hussain, and Fayyaz Hussain
In this study, ternary aluminum-based chalcogenide materials are discussed since these are found to be very appealing for multifunction devices. Here, the structural, optoelectronic, mechanical, and vibrational properties of RbAlTe2 and CsAlTe2 are observed via density functional theory (DFT). An indirect energy band gap is noted to be increased from 1.33 eV to 1.96 eV for RbAlTe2 and 1.28 eV to 1.83 eV for CsAlTe2 by employing improved functional as modified by Trans and Blaha. The calculated formation energy appears to be decreasing, such as -4.39 and -3.83 eV for RbAlTe2 and CsAlTe2, respectively. The investigation of PDOS revealed that Rb-d, Cs-p, Al-p/s, and Te-p orbitals are located prominently and contribute mainly to boosting the conduction mechanism. The optical results declare CsAlTe2 as the strongest absorptive substance, which may be used to devise optoelectronic and photovoltaic devices. Moreover, six independent elastic constants show that these are mechanically stable materials, their brittle nature is confirmed by obeying Born’s stability requirements. According to the density functional perturbation theory (DFPT) approach used for analyzing phonon dispersion, there is no imaginary phonon frequency in both cases (RbAlTe2 and CsAlTe2). The overall results show that the studied materials are potential candidates for applications in photovoltaic and optoelectronic devices.
{"title":"Ultraviolet active novel chalcogenides BAlTe2 (B = Rb, Cs): the structural, optoelectronic, mechanical, and vibrational properties for energy harvesting applications through first principles approach","authors":"Rabail Fatima, R. M. Arif Khalil, Muhammad Iqbal Hussain, and Fayyaz Hussain","doi":"10.1364/ome.506814","DOIUrl":"https://doi.org/10.1364/ome.506814","url":null,"abstract":"In this study, ternary aluminum-based chalcogenide materials are discussed since these are found to be very appealing for multifunction devices. Here, the structural, optoelectronic, mechanical, and vibrational properties of RbAlTe<sub>2</sub> and CsAlTe<sub>2</sub> are observed via density functional theory (DFT). An indirect energy band gap is noted to be increased from 1.33 eV to 1.96 eV for RbAlTe<sub>2</sub> and 1.28 eV to 1.83 eV for CsAlTe<sub>2</sub> by employing improved functional as modified by Trans and Blaha. The calculated formation energy appears to be decreasing, such as -4.39 and -3.83 eV for RbAlTe<sub>2</sub> and CsAlTe<sub>2</sub>, respectively. The investigation of PDOS revealed that Rb-<i>d</i>, Cs-<i>p</i>, Al-p/s, and Te-<i>p</i> orbitals are located prominently and contribute mainly to boosting the conduction mechanism. The optical results declare CsAlTe<sub>2</sub> as the strongest absorptive substance, which may be used to devise optoelectronic and photovoltaic devices. Moreover, six independent elastic constants show that these are mechanically stable materials, their brittle nature is confirmed by obeying Born’s stability requirements. According to the density functional perturbation theory (DFPT) approach used for analyzing phonon dispersion, there is no imaginary phonon frequency in both cases (RbAlTe<sub>2</sub> and CsAlTe<sub>2</sub>). The overall results show that the studied materials are potential candidates for applications in photovoltaic and optoelectronic devices.","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":"77 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139768814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Md Tanvir Emrose, Emily L. Payne, Chenglong You, and Georgios Veronis
We introduce multilayer structures with the phase-change material Ge2Sb2Te5 (GST) for use as broadband switchable absorbers in the infrared wavelength range. We optimize both the material composition and the layer thicknesses of the multilayer structures, in order to maximize the difference between the absorption for GST in its crystalline phase and the absorption for GST in its amorphous phase in the wavelength range of interest. We show that in the optimized structures near perfect absorption can be switched to very low absorption in a broad wavelength range by switching GST from its crystalline to its amorphous phase. Our optimized lithography-free structures have better performance than harder-to-fabricate three-dimensional structures. Our results could pave the way to a new class of broadband switchable absorbers and thermal sources in the infrared wavelength range.
{"title":"Broadband switchable infrared absorbers using phase-change materials","authors":"Md Tanvir Emrose, Emily L. Payne, Chenglong You, and Georgios Veronis","doi":"10.1364/ome.509650","DOIUrl":"https://doi.org/10.1364/ome.509650","url":null,"abstract":"We introduce multilayer structures with the phase-change material Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> (GST) for use as broadband switchable absorbers in the infrared wavelength range. We optimize both the material composition and the layer thicknesses of the multilayer structures, in order to maximize the difference between the absorption for GST in its crystalline phase and the absorption for GST in its amorphous phase in the wavelength range of interest. We show that in the optimized structures near perfect absorption can be switched to very low absorption in a broad wavelength range by switching GST from its crystalline to its amorphous phase. Our optimized lithography-free structures have better performance than harder-to-fabricate three-dimensional structures. Our results could pave the way to a new class of broadband switchable absorbers and thermal sources in the infrared wavelength range.","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":"43 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139661513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We study parametric amplification of electromagnetic waves using metasurfaces. We design a variable capacitor-loaded metasurface that can amplify incident electromagnetic waves. We analyze various regimes of operation of the system and find that we can achieve a significant gain (over 10 dB) in just one layer of such a structure, and this gain can be controlled by parametric modulation. We study the instability threshold for this system and show that a simple theoretical model agrees well with the results of full numerical simulations.
{"title":"Parametric metasurfaces for electromagnetic wave amplification","authors":"Fedor V. Kovalev and Ilya V. Shadrivov","doi":"10.1364/ome.515132","DOIUrl":"https://doi.org/10.1364/ome.515132","url":null,"abstract":"We study parametric amplification of electromagnetic waves using metasurfaces. We design a variable capacitor-loaded metasurface that can amplify incident electromagnetic waves. We analyze various regimes of operation of the system and find that we can achieve a significant gain (over 10 dB) in just one layer of such a structure, and this gain can be controlled by parametric modulation. We study the instability threshold for this system and show that a simple theoretical model agrees well with the results of full numerical simulations.","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":"116 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139585708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Keiko Kitagishi, Takayuki Kawai, Masayoshi Tonouchi, and Kazunori Serita
We present a novel technique for capillary electrophoresis (CE) using terahertz (THz) waves, namely “THz-CE,” which enables us to sensitively detect separated substances in a solution flowing in a hollow of capillary whose inner diameter is smaller than 100 µm. Such THz detection could be achieved by utilizing the near-field interaction between a solution filled in a capillary and a point THz source that was locally generated by optical rectification in a nonlinear optical crystal irradiated with a femtosecond pulse laser. Here, we investigated the performance of THz-CE numerically and experimentally, and succeeded in observing the electrophoretic chromatogram for the separation between acetic acid and n-propionic acid by THz-CE.
{"title":"Terahertz-capillary electrophoresis (THz-CE) for direct detection of separated substances in solutions","authors":"Keiko Kitagishi, Takayuki Kawai, Masayoshi Tonouchi, and Kazunori Serita","doi":"10.1364/ome.500594","DOIUrl":"https://doi.org/10.1364/ome.500594","url":null,"abstract":"We present a novel technique for capillary electrophoresis (CE) using terahertz (THz) waves, namely “THz-CE,” which enables us to sensitively detect separated substances in a solution flowing in a hollow of capillary whose inner diameter is smaller than 100 µm. Such THz detection could be achieved by utilizing the near-field interaction between a solution filled in a capillary and a point THz source that was locally generated by optical rectification in a nonlinear optical crystal irradiated with a femtosecond pulse laser. Here, we investigated the performance of THz-CE numerically and experimentally, and succeeded in observing the electrophoretic chromatogram for the separation between acetic acid and <i>n</i>-propionic acid by THz-CE.","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":"36 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139585589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ekin Gunes Ozaktas, Sreyas Chintapalli, and Susanna M. Thon
Metamaterials are complex structured mixed-material systems with tailored physical properties that have found applications in a variety of optical and electronic technologies. New methods for homogenizing the optical properties of metamaterials are of increasing importance, both to study their exotic properties and because the simulation of these complex structures is computationally expensive. We propose a method to extract a homogeneous refractive index and wave impedance for inhomogeneous materials. We examine effective medium models, where inhomogeneities are subwavelength, and equivalent models where features are larger. Homogenization is only physically justified in the former; however, it is still useful in the latter if only the reflection, transmission, and absorption are of interest. We introduce a resolution of the branching problem in the Nicolson-Ross-Weir method that involves starting from the branch of the complex logarithm beginning with the minimum absolute mean derivative and then enforcing continuity, and also determine an effective thickness. We demonstrate the proposed method on patterned PbS colloidal quantum dot films in the form of disks and birefringent gratings. We conclude that effective models are Kramers-Kronig compliant, whereas equivalent models may not be. This work illuminates the difference between the two types of models, allowing for better analysis and interpretation of the optical properties of complex metamaterials.
{"title":"Optical parameter extraction for metamaterials via robust effective and equivalent medium models","authors":"Ekin Gunes Ozaktas, Sreyas Chintapalli, and Susanna M. Thon","doi":"10.1364/ome.514897","DOIUrl":"https://doi.org/10.1364/ome.514897","url":null,"abstract":"Metamaterials are complex structured mixed-material systems with tailored physical properties that have found applications in a variety of optical and electronic technologies. New methods for homogenizing the optical properties of metamaterials are of increasing importance, both to study their exotic properties and because the simulation of these complex structures is computationally expensive. We propose a method to extract a homogeneous refractive index and wave impedance for inhomogeneous materials. We examine effective medium models, where inhomogeneities are subwavelength, and equivalent models where features are larger. Homogenization is only physically justified in the former; however, it is still useful in the latter if only the reflection, transmission, and absorption are of interest. We introduce a resolution of the branching problem in the Nicolson-Ross-Weir method that involves starting from the branch of the complex logarithm beginning with the minimum absolute mean derivative and then enforcing continuity, and also determine an effective thickness. We demonstrate the proposed method on patterned PbS colloidal quantum dot films in the form of disks and birefringent gratings. We conclude that effective models are Kramers-Kronig compliant, whereas equivalent models may not be. This work illuminates the difference between the two types of models, allowing for better analysis and interpretation of the optical properties of complex metamaterials.","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":"6 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139585353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Trisha Chakraborty, Oscar A. Jimenez Gordillo, Michael Barrow, Alan R. Kramer, Michal Lipson, Thomas E. Murphy, and Karen E. Grutter
We measured the optical transmission through an SU-8 microring resonator inside a cryostat and analyzed the shift of the resonant wavelengths to determine the thermo-optic behavior around a wavelength of 1600 nm. As the temperature was decreased from room temperature (RT) to 3K, the refractive index of crosslinked SU-8 was measured to increase from 1.571 to 1.584, while the thermo-optic coefficient decreased by two orders of magnitude.
{"title":"Thermo-optic characterization of SU-8 at cryogenic temperature","authors":"Trisha Chakraborty, Oscar A. Jimenez Gordillo, Michael Barrow, Alan R. Kramer, Michal Lipson, Thomas E. Murphy, and Karen E. Grutter","doi":"10.1364/ome.509626","DOIUrl":"https://doi.org/10.1364/ome.509626","url":null,"abstract":"We measured the optical transmission through an SU-8 microring resonator inside a cryostat and analyzed the shift of the resonant wavelengths to determine the thermo-optic behavior around a wavelength of 1600 nm. As the temperature was decreased from room temperature (RT) to 3K, the refractive index of crosslinked SU-8 was measured to increase from 1.571 to 1.584, while the thermo-optic coefficient decreased by two orders of magnitude.","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":"16 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139559512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ziqiang Liu, Jierong Gu, Guang Jia, Wenfeng Zheng, Shuangquan Xie, Xiang Shen, and Zijun Liu
In this work, bulk chalcogenide glasses (Ge35As10S55)100-xGax (x = 0,1,3,5,7,9) were prepared using the traditional melt quenching method, and glass ceramics were prepared to improve the mechanical properties through heat treatment. Optical, thermal and mechanical properties of the glass and glass ceramic samples were measured by FTIR, DSC and Vickers hardness analysis. Results indicate that glass samples exhibited about 70% IR-transmission around 3–12 µm. The hardness of these pure glasses increased from 231 to 282 kgf/mm2 through gallium doping and improvement of melt-quenching conditions. The type of nanocrystals precipitated in the glass ceramics were characterized by XRD. Existence of a γ-Ga2S3 crystal phase enhanced the hardness of the glass. Also, the size and distribution of nanocrystals in the microstructure of the glass ceramics were investigated by SEM. The hardness of (Ge35As10S55)93Ga7 glass reached to 302.6 kgf/mm2 by precipitation of nanocrystals with diameter smaller than 500 nm.
{"title":"Investigation on gallium doping Ge-As-S chalcogenide glass and glass ceramics","authors":"Ziqiang Liu, Jierong Gu, Guang Jia, Wenfeng Zheng, Shuangquan Xie, Xiang Shen, and Zijun Liu","doi":"10.1364/ome.516637","DOIUrl":"https://doi.org/10.1364/ome.516637","url":null,"abstract":"In this work, bulk chalcogenide glasses (Ge<sub>35</sub>As<sub>10</sub>S<sub>55</sub>)<sub>100-x</sub>Ga<sub>x</sub> (x = 0,1,3,5,7,9) were prepared using the traditional melt quenching method, and glass ceramics were prepared to improve the mechanical properties through heat treatment. Optical, thermal and mechanical properties of the glass and glass ceramic samples were measured by FTIR, DSC and Vickers hardness analysis. Results indicate that glass samples exhibited about 70% IR-transmission around 3–12 µm. The hardness of these pure glasses increased from 231 to 282 kgf/mm<sup>2</sup> through gallium doping and improvement of melt-quenching conditions. The type of nanocrystals precipitated in the glass ceramics were characterized by XRD. Existence of a γ-Ga<sub>2</sub>S<sub>3</sub> crystal phase enhanced the hardness of the glass. Also, the size and distribution of nanocrystals in the microstructure of the glass ceramics were investigated by SEM. The hardness of (Ge<sub>35</sub>As<sub>10</sub>S<sub>55</sub>)<sub>93</sub>Ga<sub>7</sub> glass reached to 302.6 kgf/mm<sup>2</sup> by precipitation of nanocrystals with diameter smaller than 500 nm.","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":"34 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139559752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pr3+-doped ZnF2-based glasses were prepared by using a melt-quenching method in dry N2 atmosphere. Under the excitation of a 588 nm light emitting diode (LED), ultrabroadband emissions ranging from 1245 to 1640 nm were obtained from the Pr3+-doped ZnF2-based glasses, which originate from the transitions 1D2→1G4 (producing E + S-band emission) and 1G4→3H5 (producing O-band emission) of Pr3+. The shape of the emission spectra could be tailored by varying the concentration of Pr3+. Emission spectra with the maximum full width at half maximum (FWHM) of 215 nm (1289 nm-1504 nm, covering the O + E + S-band) was obtained in the ZnF2-based glass at a doping concentration of 5000 ppm. The effects of the phonon energy of the matrix on O + E + S-band emission were also investigated. Our results showed that Pr3+-doped ZnF2-based glasses with low phonon energy might be used for constructing O + E + S-band lasers and optical amplifiers.
在干燥的氮气环境中采用熔淬法制备了掺杂 Pr3+ 的 ZnF2 基玻璃。在 588 nm 发光二极管（LED）的激发下，掺杂了 Pr3+ 的 ZnF2 基玻璃产生了 1245 至 1640 nm 的超宽带发射，这些发射源于 Pr3+ 的 1D2→1G4 转变（产生 E + S 波段发射）和 1G4→3H5 转变（产生 O 波段发射）。可以通过改变 Pr3+ 的浓度来调整发射光谱的形状。在掺杂浓度为 5000 ppm 的 ZnF2 基玻璃中，获得了最大半宽度（FWHM）为 215 nm（1289 nm-1504 nm，覆盖 O + E + S 波段）的发射光谱。我们还研究了基质声子能量对 O + E + S 波段发射的影响。我们的研究结果表明，低声子能的掺杂 Pr3+ ZnF2 基玻璃可用于构建 O + E + S 波段激光器和光放大器。
{"title":"Intense O + E + S-band emission from Pr3+-doped ZnF2-based glasses","authors":"Jinming Yan, Zhixu Jia, Junjie Wang, Chuanze Zhang, Fangning Wang, Yuting Mei, Fanchao Meng, Yasutake Ohishi, Daming Zhang, Weiping Qin, Fei Wang, and Guanshi Qin","doi":"10.1364/ome.514278","DOIUrl":"https://doi.org/10.1364/ome.514278","url":null,"abstract":"Pr<sup>3+</sup>-doped ZnF<sub>2</sub>-based glasses were prepared by using a melt-quenching method in dry N<sub>2</sub> atmosphere. Under the excitation of a 588 nm light emitting diode (LED), ultrabroadband emissions ranging from 1245 to 1640 nm were obtained from the Pr<sup>3+</sup>-doped ZnF<sub>2</sub>-based glasses, which originate from the transitions <sup>1</sup>D<sub>2</sub>→<sup>1</sup>G<sub>4</sub> (producing E + S-band emission) and <sup>1</sup>G<sub>4</sub>→<sup>3</sup>H<sub>5</sub> (producing O-band emission) of Pr<sup>3+</sup>. The shape of the emission spectra could be tailored by varying the concentration of Pr<sup>3+</sup>. Emission spectra with the maximum full width at half maximum (FWHM) of 215 nm (1289 nm-1504 nm, covering the O + E + S-band) was obtained in the ZnF<sub>2</sub>-based glass at a doping concentration of 5000 ppm. The effects of the phonon energy of the matrix on O + E + S-band emission were also investigated. Our results showed that Pr<sup>3+</sup>-doped ZnF<sub>2</sub>-based glasses with low phonon energy might be used for constructing O + E + S-band lasers and optical amplifiers.","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":"31 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139559788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sascha Kalusniak, Anastasia Uvarova, Ines Arlt, Lena Hülshoff, Patty Eckhof, Philipp Wegener, Mario Brützam, Steffen Ganschow, Christo Guguschev, Hiroki Tanaka, and Christian Kränkel
We report on the growth, spectroscopy and laser operation of Yb3+-doped mixed sesquioxide crystals. Various Yb3+-doped crystals with compositions close to (Y0.5Sc0.5)2O3 have been successfully grown by the Czochralski method and by the micro-pulling down (µ-PD) method. Our spectroscopic investigations reveal broadened stimulated emission and absorption cross-section spectra originating from the structural disorder of the mixed crystals. We find the peak wavelengths to shift by ∼1.6 nm between Y:Sc-ratios of 54:46 and 46:54 and confirm a linear relation of the peak position with the lattice constant of the host composition. In the laser experiments, we obtain highly efficient continuous-wave laser operation under pumping with an optically-pumped semiconductor laser (OPSL) at ∼975 nm, reaching slope efficiencies of up to 89% at optical-to-optical efficiencies exceeding 80% at laser wavelengths between 1037 nm and 1086 nm.
{"title":"Growth, characterization, and efficient laser operation of Czochralski- and micro-pulling-down-grown Yb3+:YScO3 mixed sesquioxides","authors":"Sascha Kalusniak, Anastasia Uvarova, Ines Arlt, Lena Hülshoff, Patty Eckhof, Philipp Wegener, Mario Brützam, Steffen Ganschow, Christo Guguschev, Hiroki Tanaka, and Christian Kränkel","doi":"10.1364/ome.513925","DOIUrl":"https://doi.org/10.1364/ome.513925","url":null,"abstract":"We report on the growth, spectroscopy and laser operation of Yb<sup>3+</sup>-doped mixed sesquioxide crystals. Various Yb<sup>3+</sup>-doped crystals with compositions close to (Y<sub>0.5</sub>Sc<sub>0.5</sub>)<sub>2</sub>O<sub>3</sub> have been successfully grown by the Czochralski method and by the micro-pulling down (µ-PD) method. Our spectroscopic investigations reveal broadened stimulated emission and absorption cross-section spectra originating from the structural disorder of the mixed crystals. We find the peak wavelengths to shift by ∼1.6 nm between Y:Sc-ratios of 54:46 and 46:54 and confirm a linear relation of the peak position with the lattice constant of the host composition. In the laser experiments, we obtain highly efficient continuous-wave laser operation under pumping with an optically-pumped semiconductor laser (OPSL) at ∼975 nm, reaching slope efficiencies of up to 89% at optical-to-optical efficiencies exceeding 80% at laser wavelengths between 1037 nm and 1086 nm.","PeriodicalId":19548,"journal":{"name":"Optical Materials Express","volume":"1 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139408696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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