Effect of hydrogen additives on characteristics of the CuBr laser

CuBr-Ne-HBr laser with a high repetition frequency of the lasing pulses at a reduced energy deposition in the discharge

“…At a frequency of 60 kHz, 0.3 μs after the pump pulse the flows of reactions (1) and (2) lead to a loss of electrons (see [16,19] for reaction flows) and, considering the inverse reactions, are as high as 3.5×10 13 For more detailed analysis of the processes in the CuBr laser plasma, we calculated critical (limiting) concentrations of metastable copper atoms and electrons. In the calculations of the critical concentrations N D 5/2 , the prepulse electron concentrations were fixed at the values presented in Tables 3 and 4 while the concentration N D 5/2 was varied.…”

“…The investigations of the CuBr laser characteristics in [33,35,36] also demonstrate this similarity in the effect of the two additives. This fact was theoretically justified in [19,23] by showing that almost immediately after addition of hydrogen or hydrogen bromide to the active medium of the CuBr laser the approximately identical concentrations of these impurity molecules are established.…”

“…Consequently, a current delay relative to voltage occurs. Note [19] that the time within which anything can change in the active medium due to electron attachment is t ∼ 1/(N e k att ), where N e is the concentration of electrons and k att is the rate constant of the electron attachment to HBr molecules. This time is much longer than the excitation pulse duration, and thus the above explanation is questionable.…”

“…The causes for the favorable effect of hydrogen and hydrogen bromide additives on the lasing characteristics of the CuBr laser are analyzed in [19] using numerical simulation. The regime with a fixed energy deposition in one excitation pulse causes fast heating of the medium with increasing pulse repetition frequency (PRF), which hampers its further increase [19,20]. In the simulations at different frequencies, the shape and value of the current pulse were fixed and set such as in the experiments [21,22] at 16.7 kHz.…”

“…Here were used the kinetic model [19,25] developed in [7,8,11,23,24,26,27]. A system of stiff differential equations, including equations for concentrations of various active-medium agents and electron heat balance equations, was self-consistently solved using the PLASER software package [28−32].…”