Reduction of the pulse repetition period jitter of a diode-pumped passively Q-switched solid-state laser

Abstract

We obtain an analytical expression for the pulse repetition period jitter of a diode-pumped solidstate laser with passive Q-switching of the resonator. The possibilities of reducing the jitter of the pulse repetition period of generation are studied.

Pulse interval jitter of a passively and actively acousto-optically Q-switched solid-state laser

“…For T < τ, fluctuations of the inverse population density of the active element at the end of the pulse of a solid-state laser additionally contribute to the jitter σ T via the variance σ 2 2 . This effect can be significant for such a laser [7].…”

“…Then, using the rate equations for a solid-state laser in a way similar to that in [7,10], we obtain the threshold density n ia of inverse population in the active cell…”

“…The high-Q switching corresponding to P a = 0 occurs for the time Δt B = D/V , where D is the effective diameter of the laser-beam cross section in the cell medium, and D ≤ b. The pulse generation of a solid-state laser starts at the instant t 0 when the inverse-population density n(t) [7,10] in the active cell and the threshold density n ia (t) become identical, namely,…”

“…A common pulsed passively Q-switched solid-state laser features a high instability of T [4][5][6]. For reducing the pulse interval jitter, either combined diode pumping of such a laser is used [3,7] or the second, active Q-switch is additionally introduced into its resonator [8].…”

Pulse interval jitter of a diode-pumped solid-state laser with instantaneous Q-switching of the resonator

“…The pulse interval jitter of the solid-state lasers due to random variations in the time of Q-switching of the resonator, which are caused by fluctuations of the diode-pump power, lasing threshold, density of the inverse population of the active element and other system parameters, is studied in [6][7][8]. Analyzing the jitter of T , it was assumed in those works that the lasing pulse starts at the time of Q-switching in the resonator, i.e., when the inverse density in the active element is equal to the threshold density [6][7][8].…”