Growth of Potassium Lithium Niobate Single-Crystal Fibers by the Laser-Heated Pedestal Growth Method

ABSTRACTYttrium iron garnet (YIG) single crystal fibers of nominal composition Y3Fe5O12 were grown by the laser heated pedestal growth (LHPG) technique, a miniaturized floated-zone process. YIG which melts incongruently, was grown at a temperature below the peritectic decomposition temperature under self-adjusting conditions even though it has very narrow solidification region according to the Y2O3-Fe2O3 phase diagram. YIG fibers in diameter ranges from 100 to 750 μm were grown at various growth rates and conditions, and analyzed by x-ray diffraction, electron microprobe, and IR-VIS spectroscopy. Infrared transparent YIG fibers were grown at rates below 12 mm/h in air. At these growth rates, yttrium orthoferrite and iron-oxide inclusions within the YIG fiber, which act as IR scattering centers, were significantly reduced. The transparency of the fibers was more dependent on the growth rate than the stability of the molten zone. Surface ridges containing an Fe-rich composition were observed at all growth rates. These were associated with molten zone instability.

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Periodically poled lithium niobate single-crystal fibers for frequency conversion applications

Nonlinear Optics: Materials, Fundamentals and Applications ◽

10.1364/nlo.2004.thc7 ◽

2004 ◽

Author(s):

Yalin Lu ◽

Iyad A. Dajani ◽

R. J. Knize

Keyword(s):

Lithium Niobate ◽

Single Crystal ◽

Frequency Conversion ◽

Periodically Poled ◽

Lithium Niobate Single Crystal ◽

Periodically Poled Lithium Niobate ◽

Crystal Fibers

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Growth of barium metaborate (BaB2O4) single crystal fibers by the laser-heated pedestal growth method

Journal of Crystal Growth ◽

10.1016/0022-0248(88)90370-3 ◽

1988 ◽

Vol 91 (1-2) ◽

pp. 81-89 ◽

Cited By ~ 41

Author(s):

D.Y. Tang ◽

R.K. Route ◽

R.S. Feigelson

Keyword(s):

Single Crystal ◽

Growth Method ◽

Crystal Fibers ◽

Laser Heated ◽

Barium Metaborate

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Domain-Reversed Lithium Niobate Single-Crystal Fibers are Potentially for Efficient Terahertz Wave Generation

Advances in OptoElectronics ◽

10.1155/2008/208458 ◽

2008 ◽

Vol 2008 ◽

pp. 1-5

Author(s):

Yalin Lu ◽

Kitt Reinhardt

Keyword(s):

Lithium Niobate ◽

Single Crystal ◽

Frequency Conversion ◽

Optical Microscope ◽

Terahertz Wave ◽

Nonlinear Frequency ◽

Periodic Domain ◽

Nonlinear Frequency Conversion ◽

Lithium Niobate Single Crystal ◽

Crystal Fibers

Nonlinear frequency conversion remains one of the dominant approaches to efficiently generate THz waves. Significant material absorption in the THz range is the main factor impeding the progress towards this direction. In this research, a new multicladding nonlinear fiber design was proposed to solve this problem, and as the major experimental effort, periodic domain structure was introduced into lithium niobate single-crystal fibers by electrical poling. The introduced periodic domain structures were nondestructively revealed using a crossly polarized optical microscope and a confocal scanning optical microscope for quality assurance.

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Growth of Optical Quality Sapphire Single Crystal Fibers

MRS Proceedings ◽

10.1557/proc-172-273 ◽

1989 ◽

Vol 172 ◽

Author(s):

Dieter H. Jundt ◽

Martin. M. Fejer ◽

Robert. L. Byer

Keyword(s):

Single Crystal ◽

Near Infrared ◽

Growth Dynamics ◽

Damage Threshold ◽

Optical Quality ◽

Potential Applications ◽

Growth Method ◽

Sapphire Single Crystal ◽

Crystal Fibers ◽

Laser Heated

AbstractVoid-free sapphire single crystal fibers with diameters of 110 μm and 60 μm and lengths of over 2 m have been grown by the laser-heated pedestal growth method. The growth dynamics of the floating zone was studied and shows the features expected from a simple theoretical model. Optical losses have a minimum of 0.5 dB/m in the near infrared at 1064 nm. An absorption band centered at 400 nm results in losses of up to 20 dB/m in the visible. The fibers have potential applications in high temperature thermometry and in delivery systems for laser surgery. Absorption losses of 0.88 dB/m with a damage threshold higher than 1.2 kJ/cm2 at 2936 nm made tissue ablation feasible with fibers several meters in length.

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