Power scaling analysis of fiber lasers and amplifiers based on non-silica materials

A developed formalism1 for analyzing the power scaling of diffraction limited fiber lasers and amplifiers is applied to a wider range of materials. Limits considered include thermal rupture, thermal lensing, melting of the core, stimulated Raman scattering, stimulated Brillouin scattering, optical damage, bend induced limits on core diameter and limits to coupling of pump diode light into the fiber. For conventional fiber lasers based upon silica, the single aperture, diffraction limited power limit was found to be 36.6kW. This is a hard upper limit that results from an interaction of the stimulated Raman scattering with thermal lensing. This result is dependent only upon physical constants of the material and is independent of the core diameter or fiber length. Other materials will have different results both in terms of ultimate power out and which of the many limits is the determining factor in the results. Materials considered include silica doped with Tm and Er, YAG and YAG based ceramics and Yb doped phosphate glass. Pros and cons of the various materials and their current state of development will be assessed. In particular the impact of excess background loss on laser efficiency is discussed.

[1]  T. Y. Fan,et al.  Measurement of thermo-optic properties of Y3Al5O12, Lu3Al5O12, YAIO3, LiYF4, LiLuF4, BaY2F8, KGd(WO4)2, and KY(WO4)2 laser crystals in the 80–300K temperature range , 2005 .

[2]  Shouhuan Zhou,et al.  Monolithic Q-switched Cr,Yb:YAG laser , 2003 .

[3]  C. E. Chryssou,et al.  Kilowatt-class single-frequency fiber sources (Invited Paper) , 2005, SPIE LASE.

[4]  Daniel Vivien,et al.  A simple model for the prediction of thermal conductivity in pure and doped insulating crystals , 2003 .

[5]  B. Samson,et al.  Tm-Doped Fiber Lasers: Fundamentals and Power Scaling , 2009, IEEE Journal of Selected Topics in Quantum Electronics.

[6]  M. Dubinskii,et al.  Highly scalable, resonantly cladding-pumped, Er-doped fiber laser with record efficiency. , 2009, Optics letters.

[7]  R. Horley,et al.  Erbium:Ytterbium Codoped Large-Core Fiber Laser With 297-W Continuous-Wave Output Power , 2007, IEEE Journal of Selected Topics in Quantum Electronics.

[8]  Gregory W. Faris,et al.  High-resolution stimulated Brillouin gain spectroscopy in glasses and crystals , 1993 .

[9]  John A. Caird,et al.  Spectroscopic, optical, and thermomechanical properties of neodymium- and chromium-doped gadolinium scandium gallium garnet , 1986 .

[10]  Jens Limpert,et al.  The renaissance and bright future of fibre lasers , 2005 .

[11]  K. Ueda,et al.  Observation of stimulated Raman scattering in Y3Al5O12 single crystals and nanocrystalline ceramics and in these materials activated with laser ions Nd3+ and Yb3+ , 2000 .

[12]  A.H. Beshr,et al.  Raman Gain and Raman Gain Coefficient for SiO2, GeO2, B2O3 and P2O5 Glasses , 2007, 2007 National Radio Science Conference.

[13]  R. Stolen,et al.  On the fabrication of all-glass optical fibers from crystals , 2009 .

[14]  Adolf Giesen,et al.  High-power thin disk lasers , 2012, Optics/Photonics in Security and Defence.

[15]  Shibin Jiang,et al.  High-Power Yb 3+ -Doped Phosphate Fiber Amplifier , 2009 .

[16]  B. Do,et al.  Bulk optical damage thresholds for doped and undoped, crystalline and ceramic yttrium aluminum garnet. , 2009, Applied optics.

[17]  Jaroslav L Caslavsky,et al.  Study of the melting behavior of YAG single crystal by optical differential thermal analysis , 1979 .

[18]  Zhidong Yao,et al.  High peak power single frequency pulses using a short polarization-maintaining phosphate glass fiber with a large core , 2008 .

[19]  R. Beach,et al.  Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power. , 2008, Optics express.

[20]  Chien-Chih Lai,et al.  Yb3+:YAG silica fiber laser. , 2009, Optics letters.