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Scanning narrow-bandwidth xenon-chloride, oscillator-amplifier system

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Abstract

A directly tuned xenon chloride laser provides a compact and convenient source of narrow-bandwidth UV laser radiation for injection locking a high-energy amplifier. A wavelength scanning system using a carefully selected set of three eta-Ions was designed and constructed to provide high central transmission and excellent off-peak rejection. Airspaced etalons were selected for linear and precise tuning with pressure. The three etalons, spacing 25, 190, and 1420 μm, ail had an effective finesse of 25. The lowest-resolution etalon was chosen to have a free spectral range of 19 Å and the highest resolution etalon to have a single-pass bandwidth of 0.01 Å. The lasers used in these experiments were UV-preionized with discharge dimensions of 0.9-cm height × 0.7-cm width × 42-cm length.1 The oscillator and amplifier were electrically excited by magnetically switched2 pulse-forming networks of 100- and 40-ns duration, respectively. A flat dielectric total reflector and a 50 % reflective output coupler with 5-m radius of curvature formed the optical cavity of the oscillator, and a positive branch unstable resonator of magnification M = 3 with a 1-mm hole for injection was the amplifier cavity as shown in Fig. 1.

© 1986 Optical Society of America

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