Abstract
The effect of initiator pulse duration on the performance of a pulsed chain reaction chemical laser is investigated using a two-level vibrational model. Analytic results are presented for a saturated laser in the limits of weak and strong initiation. The initiator is assumed to provide a uniform (e.g., electron beam), parabolic (e.g., flash-lamp), or power-law variation of F-atom production rate ḞB with time. Laser performance is presented as a function of tB /te, where tB and te are initiator and laser pulse times, respectively. In the weak initiation regime, an increase of tB /te from zero to one results in a decrement in laser output energy of 20 and 33 (1)/(3) % for a flash-lamp and electron-beam initiator, respectively. In the strong initiation regime, an increase of tB /te from zero to one results in an energy decrement of only 5 and 10% for a flash-lamp and electron-beam initiator, respectively. In each case, the laser-pulse time te is increased by a factor of 2 as tB /te increases from zero to one. For strong electron-beam initiation, peak laser intensity occurs at the end of the initiation pulse when tB /te?2/3, and occurs in the time interval 0.630?t/te?2/3 when tB /te≳2/3.
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