All-diode-pumped quasi-continuous burst-mode laser for extended high-speed planar imaging.

An all-diode-pumped, multistage Nd:YAG amplifier is investigated as a means of extending the duration of high-power, burst-mode laser pulse sequences to an unprecedented 30 ms or more. The laser generates 120 mJ per pulse at 1064.3 nm with a repetition rate of 10 kHz, which is sufficient for a wide range of planar laser diagnostics based on fluorescence, Raman scattering, and Rayleigh scattering, among others. The utility of the technique is evaluated for image sequences of formaldehyde fluorescence in a lifted methane-air diffusion flame. The advantages and limitations of diode pumping are discussed, along with long-pulse diode-bar performance characteristics to guide future designs.

[1]  A. Dreizler,et al.  New Perspectives on Turbulent Combustion: Multi-Parameter High-Speed Planar Laser Diagnostics , 2011 .

[2]  R B Miles,et al.  High-energy pulse-burst laser system for megahertz-rate flow visualization. , 2000, Optics letters.

[3]  Thomas Seeger,et al.  Characterization of a CH planar laser-induced fluorescence imaging system using a kHz-rate multimode-pumped optical parametric oscillator. , 2012, Applied optics.

[4]  Assaad R. Masri,et al.  High-speed OH-PLIF imaging of extinction and re-ignition in non-premixed flames with various levels of oxygenation , 2011 .

[5]  W. Koechner,et al.  Transient thermal profile in optically pumped laser rods , 1973 .

[6]  N. Jiang,et al.  Demonstration of high-speed 1D Raman scattering line imaging , 2010 .

[7]  G. Choi,et al.  High Repetition Rate Simultaneous CH / OH PLIF in Turbulent Jet Flame , 2012 .

[8]  C. Kaminski,et al.  High repetition rate planar laser induced fluorescence of OH in a turbulent non-premixed flame , 1999 .

[9]  Naibo Jiang,et al.  MHz-rate nitric oxide planar laser-induced fluorescence imaging in a Mach 10 hypersonic wind tunnel. , 2011, Applied optics.

[10]  N. Jiang,et al.  Multi-kHz temperature imaging in turbulent non-premixed flames using planar Rayleigh scattering , 2012 .

[11]  Naibo Jiang,et al.  Ultrahigh-frame-rate nitric oxide planar laser-induced fluorescence imaging. , 2008, Optics letters.

[12]  N. Jiang,et al.  Multi-kHz mixture fraction imaging in turbulent jets using planar Rayleigh scattering , 2012 .

[13]  Naibo Jiang,et al.  Advances in generation of high-repetition-rate burst mode laser output. , 2008, Applied optics.

[14]  Sukesh Roy,et al.  Quasi-continuous burst-mode laser for high-speed planar imaging. , 2012, Optics letters.

[15]  S. Kotake,et al.  Combustion noise: Effects of the velocity turbulence of unburned mixture , 1990 .

[16]  C. Carter,et al.  Sustained multi-kHz flamefront and 3-component velocity-field measurements for the study of turbulent flames , 2009 .

[17]  Tim Lieuwen,et al.  The Role of Unmixedness and Chemical Kinetics in Driving Combustion Instabilities in Lean Premixed Combustors , 1998 .

[18]  Naibo Jiang,et al.  Narrow-linewidth megahertz-rate pulse-burst laser for high-speed flow diagnostics. , 2004, Applied optics.

[19]  Yei-Chin Chao,et al.  An experimental investigation of the blowout process of a jet flame , 2000 .

[20]  Volker Sick,et al.  Hydroxyl radical imaging at kHz rates using a frequency-quadrupled Nd:YLF laser , 2009 .

[21]  Brian S Thurow,et al.  Third-generation megahertz-rate pulse burst laser system. , 2009, Applied optics.

[22]  N. Jiang,et al.  Advances in generation of high-repetition-rate burst mode laser output , 2009 .

[23]  E. Riedel,et al.  Measurements of Dynamic Optical Distortion in Nd‐Doped Glass Laser Rods , 1967 .

[24]  X. Duan,et al.  Laser Diagnostic Study of the Mechanism of a Periodic Combustion Instability in a Gas Turbine Model Combustor , 2005 .

[25]  Frederik Fuest,et al.  Ultrahigh laser pulse energy and power generation at 10 kHz. , 2012, Optics letters.

[26]  W. Triebel,et al.  Flame turbulences recorded at 1 kHz using planar laser induced fluorescence upon hot band excitation of OH radicals , 2006 .

[27]  Walter R. Lempert,et al.  Development of high-repetition rate CH PLIF imaging in turbulent nonpremixed flames , 2011 .

[28]  N. Jiang,et al.  High-speed CH2O PLIF imaging in turbulent flames using a pulse-burst laser system , 2012 .

[29]  Thomas Seeger,et al.  High-speed CH planar laser-induced fluorescence imaging using a multimode-pumped optical parametric oscillator. , 2011, Optics letters.

[30]  Naibo Jiang,et al.  Ultrahigh-frame-rate OH fluorescence imaging in turbulent flames using a burst-mode optical parametric oscillator. , 2009, Optics letters.