[1] DAVIS K M,MIURA K,SUGIMOTO N,et al.Writing waveguides in glass with a femtosecond laser[J].Opt Lett,1996,21(21):1729-1731.
[2] GLEZER E N,MILOSAVLJEVIC M,HUANG L,et al.3-D opticalstorage inside transparent materials[J].Opt Lett,1996,21(24):2023-2025.
[3] CHAN J W,HUSER T,RISBUD S,et al.Structural changes in fused silica after exposure to focused femtosecond laser pulses[J].Opt Lett,2001,26(21):1726-1728.
[4] SCHAFFER Ch B,BRODEUR A,GARCA J F,et al.Micromachining bulk glass by use of femtosecond laser pulses with nanojoule energy[J].Opt Lett,2001,26(2):93-95.
[5] NOLTE S,WILL M,BURGHOFF J,et al.Femtosecond waveguidewriting:a new avenue to three-dimensional integrated optics[J].Appl Phys,2003,A77(1):109-111.
[6] MINOSHIMA K,KOWALEVICZ A M,HARTL I,et al.Photonic device fabrication in glass by use of nonlinear materials processing with a femtosecond laser oscillator[J].Opt Lett,2001,26(19):1516-1518.
[7] DELLA V G,OSELLAME R,CHIODO N,et al.C-band waveguideamplifier produced by femtosecond laser writing[J].Optics Express,2005,13(16):5976-5982.
[8] TACCHEO S,DELLA V G,OSELLAME R,et al.Er:Yb-dopedwaveguide laser fabricated by femtosecond laser pulses[J].Opt Lett,2004,29(22):2626-2628.
[9] DELLA V G,TACCHEO S,OSELLAME R,et al.1.5μm single longitudinal mode waveguide laser fabricated by femtosecond laser writing[J].Optics Express,2007,15(6):3190-3194.
[10] CHEN H Y,LIU Y Zh,DAI J Zh,et al.Design of Er3+-Yb3+ co-doped phosphate glass (LGS-L) waveguide amplifier[J].Acta Optica Sinica,2003,23(6):697-701(in Chinese).
[11] KELSON I,HARDY A A.Strongly pumped fiber lasers[J].IEEE J Q E,1998,34(9):1570-1577.
[12] OSELLAME R,CERULLO G,TACCHEO S,et al.Femtosecond laser writing of symmetrical optical waveguides by astigmatically shaped beams[J].SPIE,2004,5451:360-368.
[13] OSELLAME R,CHIODO N,VALLE G,et al.Optical waveguide writing with a diode-pumped femtosecond oscillator[J].Opt Lett,2004,29(16):1900-1902.
[14] KARÁSEK M.Optimum design of Er3+-Yb3+ codoped fibers forlarge-signal high-pump-power applications[J].IEEE J Q E,1997,33(10):1699-1705.