Figure 8 - uploaded by Vladimir Kurlov
Content may be subject to copyright.
Principle of sapphire crucible growth by the NCS technique: (a) growing a tubular crystal, (b) growing a monolithic crystal, (c) transition from a monolithic crystal to a tubular one. At the right-image of transition from a hollow crystal to a solid one and vice versa. 

Principle of sapphire crucible growth by the NCS technique: (a) growing a tubular crystal, (b) growing a monolithic crystal, (c) transition from a monolithic crystal to a tubular one. At the right-image of transition from a hollow crystal to a solid one and vice versa. 

Source publication
Chapter
Full-text available
The noncapillary shaping (NCS) technique is proposed for growth of sapphire shaped crystals with a predetermined and variable cross-section. Behavior of the weight signal in automated control system during the process of transition from a tubular crystal to a monolithic one using the NCS technique is considered in present research. This behavior is...

Similar publications

Conference Paper
Full-text available
The recent upsurge in wireless communications demands devices working at higher frequencies with higher output densities. In general, wide-bandgap materials seem to be the reliable choice for these applications, specifically GaN HEMT that has shown great advantage over its previous counterparts. A holistic optimization technique is proposed to defi...
Article
Full-text available
Optical absorption, photo- and cathodoluminescence of a sapphire single crystal (α-Al2O3) exposed to pulsed nanosecond radiation with high-power ion beams C⁺/H⁺ with an energy of 300 keV and energy density 0.5-1.5 J/cm² were first investigated in this work. It was found that under ion irradiation accompanied by heating of sapphire up to melting, th...
Article
We investigated the performance of a multi-slab Nd:glass laser amplifier using a sapphire face-cooled design. The experimental amplification of 10-ns pulses, to an output energy of 560 mJ at a repetition rate of 1 Hz with an energy stability of 0.39% RMS was achieved, when pumped by 10 J of diode energy at 802 nm, corresponding to an optical to opt...
Article
Full-text available
A single-order harmonic pulse in the vacuum-ultraviolet (VUV) is highly desirable for time-resolved photoelectron spectroscopy (TRPES) of polyatomic molecules. A high-power 9th harmonic of a Ti:sapphire laser (hv = 14 eV) is obtained using a UV driving laser at 270 nm (the 3rd harmonic). We describe our recent efforts to develop VUV TRPES combined...

Citations

... As shown in Fig. 1 (b), the melt is delivered to the growth interface through a non-capillary channel, with a diameter greater than a capillary constant. NCS yields growth of high-quality sapphire shaped crystals of various predetermined cross-sections, either constant (e.g., rods, thick ribbons, and tubes with large thickness of the wall) or variable (e.g., crucibles and hemispheres) along the growth direction [40][41][42]. ...
... As shown in Fig. 1 (b), the melt is delivered to the growth interface through a non-capillary channel, with a diameter greater than a capillary constant. NCS yields growth of high-quality sapphire shaped crystals of various predetermined cross-sections, either constant (e.g., rods, thick ribbons, and tubes with large thickness of the wall) or variable (e.g., crucibles and hemispheres) along the growth direction [40][41][42]. ity of shaped crystal growth -the Variable Shaping Technique (VST) technique allowing for discrete variations of cross-section dimensions and geometry during the crystal growth [43,44]. As illustrated in Fig. 1 (c), in VST, a geometry of the liquid meniscus is altered during crystallization in order to change the crystal shape. ...