Optically based diagnostics for gas-phase laser development

In this paper we describe several diagnostics that we have developed to assist the development of high power gas phase lasers including COIL, EOIL, and DPAL. For COIL we discuss systems that provide sensitive measurements of O2(a), small signal gain, iodine dissociation, and temperature. These are key operational parameters within COIL, and these diagnostics have been used world-wide to gain a better understanding of this laser system. Recently, we have developed and integrated a similar suite of diagnostics for scaling the EOIL system and will provide examples of current studies. We are also developing diagnostics for the emerging DPAL laser. These include monitors for small signal gain that will provide both a more fundamental understanding of the kinetics of DPAL and valuable data for advanced resonator design. We will stress the application of these diagnostics to realistic laser systems.

[1]  Wilson T. Rawlins,et al.  Kinetics and scaling of gain and lasing in a 1-5 kW microwave discharge oxygen iodine laser , 2010, LASE.

[2]  W. Rawlins,et al.  Dynamics of vibrationally excited ozone formed by three‐body recombination. I. Spectroscopy , 1987 .

[3]  David L. Carroll,et al.  Demonstration of an iodine laser pumped by an air–helium electric discharge , 2009, LASE.

[4]  Seonkyung Lee,et al.  Kinetics of oxygen discharges and I(2P1/2) excitation for EOIL , 2007, SPIE LASE.

[5]  David L. Carroll,et al.  Measurement of positive gain on the 1315nm transition of atomic iodine pumped by O2(a1Δ) produced in an electric discharge , 2004 .

[6]  W. T. Rawlins,et al.  Dynamics of vibrationally excited ozone formed by three-body recombination. II. Kinetics and mechanism , 1987 .

[7]  Ralph G. Pearson,et al.  Kinetics and mechanism , 1961 .

[8]  Steven J. Davis,et al.  Surface-catalyzed singlet oxygen production on iodine oxide films , 2009 .

[9]  W. T. Rawlins,et al.  Catalytically enhanced singlet oxygen for EOIL , 2009, LASE.

[10]  Richard M. Badger,et al.  Absolute Intensities of the Discrete and Continuous Absorption Bands of Oxygen Gas at 1.26 and 1.065 μ and the Radiative Lifetime of the 1Δg State of Oxygen , 1965 .

[11]  Wilson T. Rawlins,et al.  Advanced Diagnostics and Kinetics of Oxygen-Iodine Laser Systems , 2005 .

[12]  Ian M. Konen,et al.  Catalytic Enhancement of Singlet Oxygen for Hybrid Electric Discharge Oxygen-Iodine Laser Systems , 2010 .

[13]  Wilson T. Rawlins,et al.  EOIL power scaling in a 1-5 kW supersonic discharge-flow reactor , 2008, SPIE LASE.

[14]  G. Herzberg,et al.  Molecular Spectra and Molecular Structure , 1992 .

[15]  David A. Newnham,et al.  Integrated absorption intensity and Einstein coefficients for the O2 a1Δg-X3Σg- (0,0) transition: a comparison of cavity ringdown and high resolution Fourier transform spectroscopy with a long-path absorption cell , 1999 .

[16]  G. Herzberg,et al.  Molecular Spectra and Molecular Structure: I. Spectra of Diatomic Molecules , 1944 .

[17]  Seonkyung Lee,et al.  Next generation diagnostics for COIL: new approaches for measuring critical parameters , 2005, International Symposium on High Power Laser Systems and Applications.

[18]  Andrew D. Palla,et al.  Exciplex pumped alkali laser (XPAL) modeling and theory , 2010, International Symposium on High Power Laser Systems and Applications.

[19]  Andrew D. Palla,et al.  Enhanced performance of an electric oxygen-iodine laser , 2010, LASE.

[20]  William J. Kessler,et al.  Progress in the development of sensors for COIL devices , 2000, LASE.

[21]  T. Slanger,et al.  Energetic oxygen in the upper atmosphere and the laboratory. , 2003, Chemical reviews.

[22]  William J. Kessler,et al.  Observations of gain on the I(P1∕22→P3∕22) transition by energy transfer from O2(aΔg1) generated by a microwave discharge in a subsonic-flow reactor , 2005 .

[23]  Seonkyung Lee,et al.  Production of metastable singlet oxygen in the reaction of nitric oxide with active oxygen , 2008, SPIE LASE.

[24]  Paul H. Krupenie The Spectrum of Molecular Oxygen , 1972 .

[25]  David L. Carroll,et al.  Continuous-wave laser oscillation on the 1315 nm transition of atomic iodine pumped by O 2 Ña 1 DÖ produced in an electric discharge , 2005 .

[26]  S. Davis,et al.  Transition probability and collision broadening of the 1.3-μm transition of atomic iodine , 1983 .

[27]  S. J. Davis,et al.  Spectroscopic studies of alkali atom-rare gas systems , 2010, LASE.

[28]  C. Livermore,et al.  A MEMS Singlet Oxygen Generator—Part II: Experimental Exploration of the Performance Space , 2007, Journal of microelectromechanical systems.