Michel J.F. Digonnet, “Rare-Earth-Doped Fiber Lasers and Amplifiers, Revised and Expanded,” Stanford, California: Marcel Dekker Inc. (1993).
 Hideyoshi Horie, Nobuhiro Arai, Yoshitaka Mitsuishi, Naoyuki Komuro, Hideaki Kaneda, Hideki Gotoh, Masashi Usami, and Yuichi Matsushima, “Greater than 500-mW CW Kink-Free Single Transverse-Mode Operation of Weakly Index Guided Buried-Stripe Type 980-nm Laser Diodes,” IEEE PHOTONICS TECHNOLOGY LETTERS, Vol. 12, NO.10 (2000).
 N. Lichtenstein, A. Fily, C. Hermens, B. Schmidt, C. Harder, G. Knight, B. Reid, T. Oldroyd, D. Riley, N. Zayer, “1 Watt 14xy InGaAsP/InP Ridge Waveguide Pump Laser Diodes with Low Vertical Farfield and High Efficiency,” Optical Fiber Communication Conference 2003, DOI10.1109.
 E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B.C. McCollum, “Double-Clad, Offset-Core Nd Fiber Laser,” Optical Fiber Sensors, post-deadline paper, January 27, (1988).
 Cesar Jauregui, Jens Limpert and Andreas Tünnermann, ” High-Power Fibre Lasers,” Nature Photonics, Vol.7, pp. 861–867 (2013).
 Christian Wirth, Oliver Schmidt, Andrea Kliner, Thomas Schreiber, Ramona Eberhardt, and Andreas Tünnermann, “High-Power Tandem Pumped Fiber Amplifier with an Output Power of 2.9 kW,” Optics Letters, Vol. 36, Issue 16, pp. 3061-3063 (2011)
 J. O. White, “Parameters for Quantitative Comparison of Two-, Three-, and Four-Level Laser Media, Operating Wavelengths, and Temperatures”, IEEE Journal of Quantum Electron, Vol. 45, No. 10 (2009)
 K. H. Ylä-Jarkko, R. Selvas, D. B. S. Son, J. K. Sahu, C. A. Codemard, J. Nilsson, S. A. Alam, and A. B. Grudinin, “A 3.5 W 977 nm Cladding-pumped Jacketed Air-Clad Ytterbium-Doped Fiber Laser,” Advanced Solid-State Photonics, paper 103, Vol. 83 (2003).
 J. Boullet, Y. Zaouter, R. Desmarchelier, M. Cazaux, F. Salin, J. Saby, R. Bello-Doua, and E. Cormier, “High Power Ytterbium-Doped Rod-Type Three Level Photonic Crystal Fiber Laser,” Opt. Express 16, 17891 (2008).
 F. Roeser, C. Jauregui, J. Limpert, and A. Tünnermann, “94W 980nm High Brightness Yb-Doped Fiber Laser,” Opt. Express 16, 17310 (2008).
 J. Boullet, R. Dubrasquet, C. Medina, R. Bello-Doua, N. Traynor, and E. Cormier, "Millijoule-Class Yb-Doped Pulsed Fiber Laser Operating at 977nm," Opt. Lett. 35, 1650-1652 (2010).
 R. Wang, Y. Liu, J. Cao, S. Guo, L. Si, and J. Chen, "Experimental Study on the All-Fiberized Continuous-Wave Ytterbium-Doped Laser Operating near 980nm," Appl. Opt. 52, 5920-5924 (2013).
 Tzong-Yow Tsai, Yen-Cheng Fang, Huai-Min Huang, Hong-Xi Tsao, and Shih-Ting Lin, “Saturable Absorber Q- and Gain-Switched All-Yb3+ All-Fiber Laser at 976 and 1064 nm,” Optics Express, Vol. 18, Issue 23, pp. 23523-23528 (2010).
 Daniel J. Cordier and James B. Hedrick, “Rare Earths,” Minerals Yearbook, USGS (2008)
 R. Paschotta, J. Nilsson, Anne C. Tropper, and David C. Hanna, “Ytterbium-Doped Fiber Amplifiers,” IEEE Journal of Quantum Electronics, Vol.33, No.7 (1997).
 Po-Cheng Chung, “Simulation and Analysis of 976nm CW and Pulsing Ytterbium-Doped Fiber Amplifiers,” Institute of Microelectronics National Cheng Kung University, Tainan, Taiwan, R. O. C. Thesis for Master of Science, July, 2013.
 J. K. Jones, J. P. De Sandro, M. Hempstead, D. P. Shepherd, A.C. Tropper and J. S. Wilkinson. ”Spectra and Energy Levels of the Trivalent Ytterbium Ion Doped into Lithium Niobate by Thermal Indiffusion,” Optoelectronics Research Centre, University of Southampton, Southampton, U.K. S09 5NH.
 B. N. Upadhaya, Solid state laser division, ”Studies on Yb-doped double-clad CW and pulsed fiber lasers” RRCAT NEWSLETTER, Vol. 24, Issue 1, 2011.
 Govind P. Agrawal,”Fiber-optic Communication Systems, ” Wiley Interscience, Chap.3, (2002).
 Joseph T. Verdeyen, “Laser Electronics,” Prentice Hall, Prentice hall series in solid state physical electronics, (1994).
 Dmitrii Kouznetsov, Jean-François Bisson, Kazunori Takaichi, and Ken-ichi Ueda, ”Single-Mode Solid-State Laser with Short, Wide Unstable Cavity,” JOSA B, Vol. 22, Issue 8, pp. 1605-1619, 2005.
 Limin Tong, Rafael R. Gattass, Jonathan B. Ashcom, Sailing He, Jingyi Lou, Mengyan Shen, Iva Maxwell1 & Eric Mazur, ” Subwavelength-Diameter Silica Wires for Low-Loss Optical Wave Guiding,” Nature, Vol. 426, pp. 816-819 (2003).
 Eric J. Zhang, Wesley D. Sacher, and Joyce K. S. Poon, “Hydrofluoric Acid Flow Etching of Low-Loss Subwavelength-Diameter Biconical Fiber Tapers,” Optics Express, Vol. 18, Issue 21, pp. 22593-22598 (2010).
 Yinquan Yuan, Lina Wang, Liyun Ding, and Chenhui Wu, “Theory, Experiment, and Application of Optical Fiber Etching,” Applied Optics, Vol. 51, Issue 24, pp. 5845-5849 (2012)
 P. M. Shankar and R. M. Mutharasan,“Tapered Fibers for Cell Studies,” Reviews in Fluorescence, Vol, 2005, pp. 63-75 (2005).
 Abdul Rauf, Jianlin Zhao, Biqiang Jiang, Yajun Jiang, and Wei Jiang,” Bend Measurement Using an Etched Fiber Incorporating a Fiber Bragg Grating,” Optics Letters, Vol. 38, Issue 2, pp. 214-216 (2013).
 Raoul Stöckle, Christian Fokas, Volker Deckert, Renato Zenobi, Beate Sick, Bert Hecht and Urs P. Wild, “High-Quality Near-Field Optical Probes by Tube Etching,” Applied Physics Letters, Vol. 75, Issue 2, pp.160 (1999).
 Jared C. Mikkelsen and Joyce K. S. Poon, ” Microdroplet-Etched Highly Birefringent Low-Loss Fiber Tapers,” Optics Letters, Vol. 37, Issue 13, pp. 2601-2603 (2012).
 B. S. Wang, and E. W. Mies, “Advanced Topics on Fusion Splicing of Specialty Fibers and Devices,” Proc. of SPIE APOC’07, Vol.6781, pp. 678130-1-678130-13, Wuhan, China, November (2007).
 H. J. Kbashi, “Fabrication of Submicron-Diameter and Taper Fibers Using Chemical Etching,” J. Mater. Sci. Technol., Vol.28, No.7, pp. 308-312 (2012).
 Jörg Bierlich, Jens Kobelke, David Brand, Konstantin Kirsch, Jan Dellith, Hartmut Bartelt, “Nanoscopic Tip Sensors Fabricated by Gas Phase Etching of Optical Glass Fibers,” Photonic Sensors, Vol.2, No.4, pp. 331–339 (2012)