Self-initiated volume discharge for production of atomic iodine in pulsed oxygen- iodine lasers

摘要

This paper reports on investigating self-sustained volume discharge (SSVD) characteristics in CH_3I, C_3H_71, C_4H_9I, CF_3I and their mixtures with SF_6 and N_2, employed as buffer gases, and with O_2. The investigations performed in the plane-plane electrode system displaying high electric field edge enhancement have shown that in C_3H_7I, C_4H_9I and their mixtures with SF_6, N_2 and O_2 SSVD is realized in the form of a self-initiated volume discharge (SIVD) -SSVD with no any preionization. Addition of SF_6 or N_2 in C_3H_7I, C_4H_9I leads to increasing the discharge stability, the latter being not adversely affected by addition of O_2 in amounts of up to 300% of the iodide partial pressure. The fact that SSVD in C_3H_7I and C_4H_9I develops in the form of SIVD is indicative of these discharges to be promising for creation of high power pulsed and pulsed-periodic COIL. SIVD has been performed at total mixture pressures of up to 72 Torr and energy depositions of up to 130J/1 in a volume of 1.5 1. The performed experimental modeling involving laser geometry of the discharge gap gives firm evidence that SIVD is promise for being used in creation of pulse and pulse-periodic COIL.