On a Mechanism for Limiting the Frequency and Energy Characteristics of Lasers on Self-terminating Transitions of Metal Atoms

The Efficiency of the Pumping of the Lasers Based on Self-Terminating Atomic Transitions Operating in the Energy Input Cut-Off Mode

“…The CGDT charging occurs after the charging of the capacitive components from the storage capacitor discharging, the potential difference on the active medium occurs, that determines the pumping process. This process, called in [10] the "breakdown" and in [8] the "pseudobreakdown", is determined by the fact that the discharging of CGDT occurs not through the active medium and can be considered as the diffusion of electrons through the surface of the discharge ceramic channel to the anode through the cold buffer zone [11], that determines the sharp front of the pulse of the pumping. Wherein the significant share of the energy EL = L(Iph) 2 /2 accumulated in the inductance L almost does not contribute to the population inversion generation, due to the period of the discharging of the storage inductance into the active electrical consumer is ~ L/R and, consequently, the storage inductance is ineffective at the typical of LSTM the high plasma conduction.…”

“…In [5,6] was studied the similar laser operating in the energy input cut-off mode. The pumping of the active medium occurs in two stages [7,8]. At the first (preparatory) stage, the charging of the capacitive components of the discharge circuit (peaking capacity C0 and GDT's own capacity CGDT) by the energy stored in the storage capacity C occurs.…”

“…Since the dissociative recombination rate is higher than the three-particle recombination rate [9], the charging of the capacitive components could occur at the total or partial recombination in the cold buffer zones. The mode change (from the "decreased" to the "increased" energy input) occurs with the increasing of the storage capacitor voltage [7] when the charging of the capacitive components (at the preparatory stage) of the discharge circuit from the storage capacitor at the partial recombination in the cold buffer zones occurs [7,8]. Due to the increasing of the storage capacitor voltage results in the increasing of the energy output and the practical efficiency of the LSTM (relatively to the storage capacitor energy) [7], all research studied only the "increased" energy input mode and the "decreased" energy input mode was not studied.…”

“…if the GTD voltage is equal to the breakdown voltage on the anode-side cold buffer zone of the GDT. After charging CGDT during the breakdown process, according to [7,8], the electric potential difference on the active medium occurs and (at the second stage) the pumping will be occurred during discharging C and C0. The edge condition of the start of the pumping of the active medium is I1 = 0 and I2 = 0, where I1 and I2 -the circuit current related to C and C0.…”

Dependence of phantom current in a metal vapor laser on electrode geometry

“…The phantom current depends upon the buffer gas pressure inside the laser tube, discharge constituents, operating voltage, electrode geometry, etc [2]. Through an electrophysical approach, the processes limiting the frequency and the energy characteristics of radiation in the laser discharge are identified and it has been reported that a laser efficiency of up to 10% can be attained by reducing the pre-pulse electron concentration in metal vapor lasers (MVLs) [3][4][5].…”