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Crystals 2017, 7(1), 12;

Advances in Single-Crystal Fibers and Thin Rods Grown by Laser Heated Pedestal Growth

Shasta Crystals Inc., 1750 Cesar Chavez, Unit J, San Francisco, CA 94124, USA
Author to whom correspondence should be addressed.
Academic Editors: Alain Largeteau and Mythili Prakasam
Received: 30 November 2016 / Revised: 22 December 2016 / Accepted: 23 December 2016 / Published: 4 January 2017
(This article belongs to the Special Issue Crystal Growth for Optoelectronic and Piezoelectric Applications)
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Single-crystal fibers are an intermediate between laser crystals and doped glass fibers. They have the advantages of both guiding laser light and matching the efficiencies found in bulk crystals, which is making them ideal candidates for high-power laser and fiber laser applications. This work focuses on the growth of a flexible fiber with a core of dopant (Er, Nd, Yb, etc.) and a polycrystalline clad of yttrium aluminum garnet (YAG) that will exhibit good wave guiding properties. Direct growth or a combination of growth and cladding experiments are described. Scattering loss measurements at visible wavelengths, along with dopant profile characterization with damage threshold results, are also presented. For single-pass amplification, a single-pass linear gain of 7.4 was obtained for 29 nJ pulses of 5 ns duration at 1 MHz repetition rate. We also obtained a laser efficiency of over 58% in a diode-pumped configuration. These results confirm the potential for single-crystal fibers to overcome the limitations of the glass fibers commonly used in fiber lasers, making them prime candidates for high-power compact fiber lasers and amplifiers. View Full-Text
Keywords: single-crystal fiber; laser heated pedestal growth; YAG; laser; amplifier; sol-gel single-crystal fiber; laser heated pedestal growth; YAG; laser; amplifier; sol-gel

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Maxwell, G.; Ponting, B.; Gebremichael, E.; Magana, R. Advances in Single-Crystal Fibers and Thin Rods Grown by Laser Heated Pedestal Growth. Crystals 2017, 7, 12.

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