Some characteristics of a laser with a delay line and a passive Q switch

Abstract

Both geometrical and electrical asymmetry effects in capacitive argon discharges are investigated using a two-dimensional particle-in-cell coupled with Monte Carlo collision model. When changing the ratio of the top and bottom electrode surface areas and the phase shift between the two applied harmonics, the induced self-bias was found to develop separately. By adjusting the ratio between the high and low harmonic amplitudes, the electrical asymmetry effect at a fixed phase shift can be substantially optimized. However, the self-bias caused by the geometrical asymmetry hardly changed. Moreover, the separate control of these two asymmetry effects can also be demonstrated from their power absorption profiles. Both the axial and radial plasma density distributions can be modulated by the electrical asymmetry effect.

Oscillation regimes of a solid-state ring laser with active beat-note stabilization: From a chaotic device to a ring-laser gyroscope

“…2 (case θ = 0). The occurrence of such a regime may seem at first sight surprising, since the analytical condition for the stability of the bidirectional stationary regime, which reads [23] :…”

“…The recent achievement of active beat note stabilization in a diode-pumped Nd-YAG ring laser [22] revived interest for homogeneously broadened (e.g. solid-state) ring lasers, although this kind of device had already been extensively studied (see for example [23,24,25,26]). In particular, the experiment described in [22] provides both a simple tool for the study of mode coupling in a resonant macroscopic quantum device such as a toroidal superfluid [27], and a potentially new kind of ring laser gyroscope involving only standard optical components and no gaseous medium.…”

Solid-state ring laser with an external signal

“…9 Experiments reported in Ref. 10 confirm the existence of an instability of such unidirectional radiation.…”

“…The coefficient a governs the intensity of a contrarotating wave. For example, if W+» W., then (9) For currents of the type given by Eq. (8), the equations (6) can have also a steady-state solution representing an almost-standing wave which can exist near the center of the luminescence line when (10) However, this solution is inconvenient from the energy point of view because of the spatial inhomogeneity of the medium and, for this reason, it is unstable.…”

Cavity length dependence of mode beating in passively Q-switched Nd-solid state lasers

“…The cavity length of a laser resonator plays an important role in determining the temporal intensity profile of the laser output pulse(s) in both passively Q-switched and passively Q-switch mode locked (QSML) solid state lasers [1][2][3][4][5][6][7]. Cavity length can influence pulse width and or repetition rate and determine whether a single, modulated, or burst of pulses underneath an envelope is generated.…”