Jianlei Wang

Generation of 6.05J nanosecond pulses at a 1Hz repetition rate from a cryogenic cooled diode-pumped Yb:YAG MOPA system

Diode-pumped solid state laser system based on cryogenic Yb:YAG active-mirror scheme are presented with recent energy output. With improved optical design, 6.05J/1Hz pulse energy is achieved and a conceptual design with 30J output energy is theoretical simulated. The doubling efficiency of YCa4O (BO3)(YCOB) crystal is also discussed in this paper.

Study of diode-pumped Yb:YAG disk lasers at low temperature

A Yb:YAG disk laser with V-shaped stable resonator and active-mirror configuration, end-pumped by a 940-nm InGaAs laser diode array, is demonstrated. Performances and optimization of the disk laser at low temperature over a range of 130-200 K are investigated theoretically and experimentally. Laser output energy of 1.46 J/pulse operating at 10-Hz repetition rate is obtained with the optimum output coupler transmission of 30%, and the corresponding optical-to-optical efficiency is 48.7%.

Thermal analysis on grad-doped active-mirror Yb:YAG ceramic lasers

Abstract. Heat conduction, temperature distribution, thermal stress, and thermally induced refractive index of a diode-pumped active-mirror grad-doped Yb:YAG ceramic laser are analyzed and compared to a uniform-doped Yb:YAG ceramic laser. It is found that a rationally designed grad-doped Yb:YAG ceramic has a smaller temperature gradient than a uniform-doped Yb:YAG ceramic with the same absorption pump power, which results in higher output energy in the grad-doped Yb:YAG ceramic laser.

Temperature-dependent performances of diode-pumped Yb:YAG disk lasers

A Yb:YAG disk laser with V-shape stable resonator and active-mirror configuration, end-pumped by 940 nm InGaAs laser diode array, is demonstrated. Temperature dependence of output performances for the disk laser at low temperature is investigated. When the temperature of the crystal heat sink is turned to 133K, the maximum output energy of 1.46J per pulse at 1.03 μm wavelength operating at 10Hz repetition rate is obtained, the corresponding optical-to-optical efficiency is 48.7%.

Theoretical analysis of amplification performance of space-based lasers with different pump configurations

We investigate a theoretical model to accurately predict the output performances of slab laser amplifiers, which is one of the key issues in the study of space-based lasers. The realistic absorbed pump energy density, which induces nonuniformity of stored energy density in the laser medium, is introduced into the model. Using this model, the amplification performances of two space-based laser amplifiers with different pump configurations are compared. The results indicate that the bounce-pumped amplifier (BPA) achieves much higher output energy and efficiency compared with the side-pumped amplifier (SPA); it is also more suitable for space-based lasers.1. F. E. Hovis, J. Edelman, T. Schum, J. Rudd, and K. Andes, Proc. SPIE 6871, 68710E (2008).2. J. Luttmanna, K. Nicklausa, V. Morascha, S. Fua, M. Hofera, M. Trauba, H. D. Hoffmanna, R. Treichelb, C. Wuhrerc, and P. Zellerc, Proc. SPIE 6871, 687109 (2008).3. A. W. Yu, S. X. Li, G. B. Shaw, A. Seas, M. A. Stephen, E. Troupaki, A. Vasilyev, L. Ramos-Izquierdo, A. Lukemier, W. Mamakos, A. Melak, J. Guzek, and A. Rosanova, Proc. SPIE 7193, 719305 (2009).4. F. E. Hovis, N. Martin, and R. Burnham, Proc. SPIE 5798, 101 (2005).5. L. M. Frantz and J. S. Nodvik, J. Appl. Phys. 34, 2346 (1963).6. T. J. Kane, J. M. Eggleston, and R. L. Byer, IEEE J. Quantum Electron. 1, 1195 (1985).7. A. K. Sridharan, S. Saraf, and R. L. Byer, Appl. Opt. 46, 7552 (2007).8. J. M. Eggleston, L. M. Frantz, and H. Injeyan, IEEE J. Quantum Electron. 25, 1855 (1989).9. T. Rutherford, W. M. Tulloch, E. K. Gustafson, and R. L. Byer, IEEE J. Quantum Electron. 36, 205 (2000).

Derivation and analysis of Frantz-Nodvik Equation for face-pumped Zig-Zag Slab Laser Amplifier

Based on ununiformity of stored energy in laser gain medium due to the lower absorbed pump energy distribution uniformity in reality, the effective fill factor f (2 − f) of Frantz-Nodvik(F-N)Equation for Zig-zag Optical Path Slab Laser Amplifiers is modified by using the absorbed pump energy density.