1. Forthcoming papers

   Announcement Pages: A5 - A5

2. Self-focusing and defocusing of TEA CO₂ laser radiation in NH₃

   • B. K. Deka
   • R. S. Joshi
   • M. A. Rob

   Contributed Papers Pages: 1 - 4

3. Second-harmonic generation in centro-symmetric media

   • D. Epperlein
   • B. Dick
   • G. A. Reider

   Contributed Papers Pages: 5 - 10

4. Electromagnetic radiation from a polarization sheet located at an interface between two media

   • B. U. Felderhof
   • G. Marowsky

   Contributed Papers Pages: 11 - 17

5. Remote sample characterization based on fluorescence monitoring

   • P. S. Andersson
   • S. Montán
   • S. Svanberg

   Contributed Papers Pages: 19 - 28

6. Frequency stabilization and transverse mode discrimination in injection-seeded unstable resonator TEA CO₂ lasers

   • G. M. Ancellet
   • R. T. Menzies
   • A. M. Brothers

   Contributed Papers Pages: 29 - 35

7. High pressure X-ray preionized TEMA-CO₂ laser

   • R. J. M. Bonnie
   • W. J. Witteman

   Contributed Papers Pages: 37 - 39

8. Two-photon excited parametric emission from sodium atoms

   • Z. G. Wang
   • H. Schmidt
   • B. Wellegehausen

   Contributed Papers Pages: 41 - 44

9. Two-photon ionization studies of amide groups in the uv

   • R. Bruzzese
   • I. Rendina
   • E. Borsella

   Contributed Papers Pages: 45 - 50

10. Laser-induced helical structure in the isotropic phase of nematic liquid crystal

    • Zuhe Yu
    • Hsingmin Lu
    • Panming Fu

    Contributed Papers Pages: 51 - 56

11. A gold-vapor laser using Ne-H₂ as buffer gas

    • Z. G. Huang
    • H. Y. Shan
    • H. Wang

    Contributed Papers Pages: 57 - 59

12. On the mechanism of quartz surface crimping under laser irradiation

    • Yu. V. Vigant
    • A. A. Kovalev
    • N. F. Pilipetskii

    Contributed Papers Pages: 61 - 65

13. Measurement and assignment of new FIR laser lines in¹²CH₃OH and¹³CH₃OH

    • D. Pereira
    • A. Scalabrin

    Contributed Papers Pages: 67 - 69

14. Endoergic and resonant charge transfer excitation in He-Cu discharge

    • P. Mezei
    • K. Rózsa
    • P. Apai

    Contributed Papers Pages: 71 - 74