title: Low-loss propagation in Cr4+:YAG double-clad crystal fiber fabricated by sapphire tube assisted CDLHPG technique.
abstract: Cr4+:YAG double-clad crystal fiber with an uniform 10-microm core was fabricated by using a sapphire tube as a heat capacitor to stabilize the power fluctuation of the CO2 laser in the co-drawing laser-heated pedestal growth system. The uniformity of the fiber core showed a factor of 3 improvement compared to that without the use of sapphire tube. The variation of the core diameter is within the +/-1.35-degree adiabatic criterion and has a autocorrelation length of 1.7 mm. The measured propagation loss is only 0.02 dB/cm. The sapphire tube also reduces the vertical temperature gradient during the crystal fiber growth process so the 10-microm crystal core exhibits a smooth perimeter. The sapphire tube assisted system can be applied to the growth of many other optical crystal materials.
authors.affiliation: Institute of Electro-Optical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan 804, R.O.C.
authors.forename: K Y
authors.initials: KY
authors.lastname: Huang
authors.forename: K Y
authors.initials: KY
authors.lastname: Hsu
authors.forename: D Y
authors.initials: DY
authors.lastname: Jheng
authors.forename: W J
authors.initials: WJ
authors.lastname: Zhuo
authors.forename: P Y
authors.initials: PY
authors.lastname: Chen
authors.forename: P S
authors.initials: PS
authors.lastname: Yeh
authors.forename: S L
authors.initials: SL
authors.lastname: Huang
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D003198:Computer Simulation; D017076:Computer-Aided Design; D003460:Crystallization / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D053844:Lasers, Solid-State; D008962:Models, Theoretical; D012542:Scattering, Radiation
chemical_list: D002857:Chromium; D000537:Aluminum Oxide