New Trends in Growth Technique of Micro-Pulling-Down Method

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: closed (10 July 2021) | Viewed by 5228

Special Issue Editors


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Guest Editor
CNRS UMR 5306 (ILM), Claude Bernard Lyon 1 University, Villeurbanne, France
Interests: crystal growth; solid state physics; phase transition; oxides

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Guest Editor
Graduate School of Science and Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
Interests: crystal growth phenomenon under high pressure and temperature conditions; multi-step crystallization; in situ observation technique; growth kinetics; thermodynamics; micro-pulling-down method
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Special Issue Information

Dear Colleagues,

The micro-pulling-down (μ-PD) technique demonstrates some remarkable technological benefits such as small and modifiable furnace structures to control ambient temperature, uniform solute concentration, and shaping possibility. Hence, the μ-PD method is utilized as one of the most advantageous techniques available to grow a wide variety of industrial crystals for a large wide of applications, such as nonlinear optical elements and surface-acoustic-wave elements, scintillation and laser. Oxides are typical crystals grown from the melt under stationary stable regime by using the μ-PD method. Thus, important challenges, such as surface-morphological control, the formation of striations and growth ridges, limit segregation through controlling dopants concentration, the growth during the application of the external field, and so on, remain in the understanding of growth using the μ-PD method.

Today, commercial laser components using YAG fibers shape grown by µ-PD are available in the market. Therefore, the technology potential of µ-PD technique to bring solutions to the technological locks limiting the development of high power laser chain and others critical application is very promised.

Here, we invite researchers to contribute to the Special Issue of Crystals for the discussion and presentation of recent advances in the growth technique of the μ-PD method, ranging from practical experiments to computational simulation. The types of materials used are not restricted. The authors need to consider the keywords listed below. We expect to compile numerous papers.

Dr. Kheirreddine Lebbou
Dr. Harutoshi Asakawa
Guest Editors

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Keywords

  • Growth of single crystals
  • Crystal growth mechanism
  • Defects
  • Convection
  • Thermodynamics
  • Computational simulation
  • Theoretical calculation

Published Papers (2 papers)

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13 pages, 17495 KiB  
Article
Growth of SrB4O7 Crystal Fibers along the c-Axis by Micro-Pulling-Down Method
by Ryouta Ishibashi, Harutoshi Asakawa and Ryuichi Komatsu
Crystals 2021, 11(8), 987; https://doi.org/10.3390/cryst11080987 - 20 Aug 2021
Cited by 1 | Viewed by 2498
Abstract
SrB4O7 (SBO) receives much attention as solid-state ultraviolet lasers for micro-machining, photochemical synthesis, and laser spectroscopy. For the application of SBO, the SBO crystals require the control of twinning to amplify the conversion light. We also expected that the inhibitation [...] Read more.
SrB4O7 (SBO) receives much attention as solid-state ultraviolet lasers for micro-machining, photochemical synthesis, and laser spectroscopy. For the application of SBO, the SBO crystals require the control of twinning to amplify the conversion light. We also expected that the inhibitation of the SrB2O4 appearance was essential. Here, we show the growth of SBO crystals along the c-axis through the micro-pulling-down method while alternating the application of electric fields (E). Without the application, single crystals were grown. At E ≧ 400 V/cm no needle domains of SrB2O4 inside SBO crystals existed; however, composition planes were formed and twin boundaries did not appear. In contrast, the inversion of surface morphology emerged, and the convex size was especially large at 1000 V/cm. These results demonstrate that convection is generated perpendicular to the growth front by alternating the application of electric fields. This surface morphological change contradicts the conventional concept of growth through the micro-pulling-down method. The distance from seed crystals vs. grain density plot also showed that the density did not decrease with a sufficient slope. Consequently, we concluded that the selection of the c-axis as growth faces is not fruitful to fabricate twins, and the selection of the growth condition, under which geometrical selection strongly affects, is the key. Full article
(This article belongs to the Special Issue New Trends in Growth Technique of Micro-Pulling-Down Method)
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7 pages, 5040 KiB  
Article
Laser Operation of Tm: LuAG Single-Crystal Fiber Grown by the Micro-Pulling down Method
by Jian Liu, Jifei Dong, Yinyin Wang, Hangqi Yuan, Qingsong Song, Yanyan Xue, Jie Xu, Peng Liu, Dongzhen Li, Kheirreddine Lebbou, Zhanxin Wang, Yongguang Zhao, Xiaodong Xu and Jun Xu
Crystals 2021, 11(8), 898; https://doi.org/10.3390/cryst11080898 - 31 Jul 2021
Cited by 5 | Viewed by 1775
Abstract
Single crystals fiber (SCF) of LuAG doped with 2.0 at.% thulium has been grown by using micro-pulling down (µ-PD) technique. A continuous-wave output power of 2.44 W was achieved with a slope efficiency of 11.7% using a 783-nm diode laser as [...] Read more.
Single crystals fiber (SCF) of LuAG doped with 2.0 at.% thulium has been grown by using micro-pulling down (µ-PD) technique. A continuous-wave output power of 2.44 W was achieved with a slope efficiency of 11.7% using a 783-nm diode laser as pump source. The beam quality factors M2 were 1.14 and 1.67 in the x and y directions, respectively. This is, to the best of our knowledge, the first report on the Tm:LuAG SCF laser. Using ray tracing analysis, the influence of laser performance by the pump intensity distribution in the SCF was also studied. Full article
(This article belongs to the Special Issue New Trends in Growth Technique of Micro-Pulling-Down Method)
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