944 mJ Nd:YAG planar waveguide laser amplifier with the optical to optical efficiency of 52.

We demonstrated a quasi-continuous wave (QCW) Nd:YAG planar waveguide laser amplifier with the single pulse output energy of 944 mJ. At the pulse repetition frequency (PRF) of 100 Hz, 1064 nm seed laser was coupled into the planar waveguide laser amplifier with the single pulse energy of 128 mJ and the pulse duration of 192 μs. With the total pump energy of 1582 mJ, the extracted energy of 816 mJ was obtained, leading to an optical to optical efficiency of 52% and an electrical to optical efficiency of 28%. To the best our knowledge, it is up to now the highest efficiency and output energy in Nd:YAG planar waveguide laser amplifier reported. At the maximum output, the beam quality factors M2 were measured to be 3.44 and 4.81 in the guided direction and unguided direction respectively, and the polarization degree was 98.6%. Higher average power could be obtained with the better performance of seeder oscillator.

[1]  Weibiao Chen,et al.  Conductively-cooled, high-energy, single-frequency diode pumped slab laser for space applications , 2011 .

[2]  S. K. Vanga,et al.  High-gain optical waveguide amplifier based on proton beam writing of Nd:YAG crystal. , 2015, Optics express.

[3]  H. Baker,et al.  Self-imaging and high-beam-quality operation in multi-mode planar waveguide optical amplifiers. , 2002, Optics express.

[4]  Xiaojin Cheng,et al.  High-power Nd:YAG planar waveguide laser with YAG and Al2O3 claddings , 2008 .

[5]  Hao Jiang,et al.  Diode-pumped composite ceramic Nd:YAG planar waveguide amplifier with 327 mJ output at 100 Hz repetition rate , 2016 .

[6]  Y. Jeong,et al.  Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power. , 2004, Optics express.

[7]  Minglun Gong,et al.  An end-pumped Nd:YAG planar waveguide laser with an optical to optical conversion efficiency of 58% , 2008 .

[8]  Robert W. Eason,et al.  Yb:YAG planar waveguide lasers grown by pulsed laser deposition: 70% slope efficiencies at 16 W of output power , 2016, SPIE LASE.

[9]  Cesar Jauregui,et al.  Tm-based fiber-laser system with more than 200  MW peak power. , 2015, Optics letters.

[10]  David M. Filgas,et al.  Recent results for the Raytheon RELI program , 2012, Other Conferences.

[11]  M. Zervas,et al.  High Power Fiber Lasers: A Review , 2014, IEEE Journal of Selected Topics in Quantum Electronics.

[12]  R. Poprawe,et al.  Partially end-pumped Nd:YAG slab laser with a hybrid resonator. , 1998, Optics letters.

[13]  Amol Choudhary,et al.  Pulsed laser deposited diode-pumped 7.4 W Yb:Lu₂O₃ planar waveguide laser. , 2015, Optics express.

[14]  W. Bonner,et al.  Laser oscillation from Ho3+ and Nd3+ ions in epitaxially grown thin aluminum garnet films , 1973 .