Femtosecond laser-written double-cladding waveguides in Nd:GdVO4 crystal: Raman analysis, guidance, and lasing

Abstract. We report on waveguide lasers at 1064.5 nm in femtosecond laser-written double-cladding waveguides in Nd:GdVO4 crystals. The cladding waveguides guide both transverse electric (TE)- and transverse magnetic (TM)-polarized modes with considerably symmetric single-modal profiles and show good transmission properties (propagation loss as low as 1.0  dB/cm). The detailed structure of the single and double claddings has been imaged by means of μ-Raman analysis, and the observed slight fabrication asymmetries with respect to an ideal circular cladding are in well agreement with the observed differences in TE/TM propagation losses. Importantly, the Raman imaging shows the complete absence of lattice defect at the laser active volume. Under the optical pumping at 808 nm, a maximum output power up to 0.43 W of the continuous wave waveguide laser with a slope efficiency of 52.3% has been achieved in the double-cladding waveguide, which is 21.6% and 23% higher than that from a single-inner cladding waveguide. Furthermore, the maximum output power of the waveguide laser is 72% higher than that of the double-line waveguide due to the double-cladding design.

[1]  J. R. Vázquez de Aldana,et al.  Femtosecond-laser-written, stress-induced Nd:YVO4 waveguides preserving fluorescence and Raman gain. , 2010, Optics letters.

[2]  Günter Huber,et al.  Highly efficient Yb:YAG channel waveguide laser written with a femtosecond-laser. , 2010, Optics express.

[3]  Feng Chen,et al.  Channel waveguide lasers in Nd:GGG crystals fabricated by femtosecond laser inscription. , 2011, Optics express.

[4]  Marian Zamfirescu,et al.  Laser emission from diode-pumped Nd:YAG ceramic waveguide lasers realized by direct femtosecond-laser writing technique. , 2014, Optics express.

[5]  Feng Chen,et al.  70% slope efficiency from an ultrafast laser-written Nd:GdVO4 channel waveguide laser. , 2010, Optics express.

[6]  Feng Chen,et al.  Efficient continuous-wave laser operation at 1064 nm in Nd:YVO 4 cladding waveguides produced by femtosecond laser inscription , 2012 .

[7]  Mikhail A. Noginov,et al.  Study of luminescence concentration quenching and energy transfer upconversion in Nd-doped LaSc 3 (BO 3 ) 4 and GdVO 4 laser crystals , 1998 .

[8]  Alexander A. Kaminskii,et al.  Laser crystals and ceramics: recent advances , 2007 .

[9]  James A. Piper,et al.  Ultrafast laser written active devices , 2009 .

[10]  J. R. Vázquez de Aldana,et al.  Channel waveguide lasers in Nd:LGS crystals. , 2013, Optics express.

[11]  Andreas Tünnermann,et al.  Femtosecond laser written stress-induced Nd:Y3Al5O12 (Nd:YAG) channel waveguide laser , 2009 .

[12]  H. Eichler,et al.  Crystal-host Gd0.5Lu0.5VO4 for Ln3+-lasants: a new high-gain many-phonon χ(3)-active tetragonal vanadate—SRS spectroscopy and nonlinear-laser effects , 2012, Applied Physics B.

[13]  Marian Zamfirescu,et al.  Cladding waveguides realized in Nd:YAG ceramic by direct femtosecond-laser writing with a helical movement technique , 2014 .

[14]  Feng Chen,et al.  Femtosecond-Laser-Inscribed BiB3O6 Nonlinear Cladding Waveguide for Second-Harmonic Generation , 2012 .

[15]  Feng Chen,et al.  Mid-infrared waveguide lasers in rare-earth-doped YAG. , 2012, Optics letters.

[16]  Feng Chen,et al.  Optical waveguides in crystalline dielectric materials produced by femtosecond‐laser micromachining , 2014 .

[17]  Erik Kaestner.  Integrated Optical Circuits And Components Design And Applications , 2016 .

[18]  Simon Gross,et al.  Efficient 2.9 μm fluorozirconate glass waveguide chip laser. , 2013, Optics letters.

[19]  Christos Grivas,et al.  Optically pumped planar waveguide lasers, Part I: Fundamentals and fabrication techniques , 2011 .

[20]  Feng Chen,et al.  Optical waveguides in Nd:GdVO4 crystals fabricated by swift N3+ ion irradiation , 2012 .

[21]  L. Roso,et al.  Refractive index change mechanisms in femtosecond laser written ceramic Nd:YAG waveguides: micro-spectroscopy experiments and beam propagation calculations , 2009 .

[22]  Eric Mazur,et al.  Femtosecond laser micromachining in transparent materials , 2008 .

[23]  Nemanja Jovanovic,et al.  Low bend loss waveguides enable compact, efficient 3D photonic chips. , 2013, Optics express.

[24]  A. Ródenas,et al.  High-contrast step-index waveguides in borate nonlinear laser crystals by 3D laser writing. , 2011, Optics express.

[25]  Huai-jin Zhang,et al.  Investigations on the Growth and Laser Properties of Nd:GdVO4 Single Crystal , 1998 .

[26]  G. Brambilla,et al.  Tunable, continuous-wave Ti:sapphire channel waveguide lasers written by femtosecond and picosecond laser pulses. , 2012, Optics letters.

[27]  Roberta Ramponi,et al.  Two straightforward methods for the measurement of optical losses in planar waveguides , 2002 .

[28]  K. Miura,et al.  Writing waveguides in glass with a femtosecond laser. , 1996, Optics letters.

[29]  B. Chai,et al.  Excited state absorption and stimulated emission of Nd3+ in crystals. Part 2: YVO4, GdVO4, and Sr5(PO4)3F , 1998 .

[30]  Simon Gross,et al.  High slope efficiency and high refractive index change in direct-written Yb-doped waveguide lasers with depressed claddings. , 2013, Optics express.

[31]  Daniel Jaque,et al.  Highly efficient laser action in femtosecond-written Nd:yttrium aluminum garnet ceramic waveguides , 2008 .

[32]  Andreas Tünnermann,et al.  Origins of waveguiding in femtosecond laser-structured LiNbO3 , 2007 .

[33]  Ian Bennion,et al.  Low loss depressed cladding waveguide inscribed in YAG:Nd single crystal by femtosecond laser pulses. , 2012, Optics express.

[34]  Efficient laser emission in diode-pumped Nd:YAG buried waveguides realized by direct femtosecond-laser writing , 2013 .