Kinetics of the operation of a distributed-feedback dye laser with nanosecond excitation

Broadband collimated generation in YAG:Yb crystal and ytterbium glass under LiF:F+2color center laser pumping

“…The structures with sinusoidal modulation of the gain were realized by pumping dyes with interfering laser beams [15,16]. Under nanosecond pumping such type of dfl could work without a resonator and emit picosecond pulses due to "self Q-switching" effect [15,16]. In contrast to this case in our experiments the high contrast movable structures were formed by periodic shock waves propagating in solid-state active media.…”

“…An availability of laser oscillations on a dfl structure formed by a hypersonic acoustic wave was already considered in the pioneer paper [14], but was not realized. The structures with sinusoidal modulation of the gain were realized by pumping dyes with interfering laser beams [15,16]. Under nanosecond pumping such type of dfl could work without a resonator and emit picosecond pulses due to "self Q-switching" effect [15,16].…”

Excitation of Periodical Shock Waves in Solid–State Optical Media (Yb:YAG, Glass) at SBS of Focused Low–Coherent Pump Radiation: Structure Changes, Features of Lasing

“…Indeed, a distributed feedback (DFB) laser (Kogelnik & Shank, 1971) appeared in fact in our experiments in the hypersonic wave grating region. Such a laser operates without an external resonator and can emit ps pulses (Bor & Muller, 1986;Katarkevich et al, 1996;Kogelnik & Shank, 1971). Unlike dye DFB lasers based on a photo-induced sinusoidal grating in the medium, the highcontrast DFB structure was formed under our conditions due to modulation of the medium parameters (refractive index, inversion) during the propagation of a sequence of intense hypersonic waves.…”

“…Lasing during the ccl pump pulse was observed both in samples mounted inside the resonator and in samples without the resonator, in particular, in samples mounted at an angle to the pump beam axis. The generation of ps pulses in dye DFB lasers on a stationary grating pumped by ns pulses occurs due to self-Qswitching mechanism: `blowing away' of the gain grating by the structure emission itself (Bor & Muller, 1986;Katarkevich et al, 1996). Unlike this, upon the SBS of ccl pump radiation, a DFB structure moving in the medium appears with period Λ which can depend on the pump intensity (pressure in the medium).…”

The effect of pulsewidth of pumping pulse on the stability of distributed feedback dye laser

“…Since their invention by Kogelnik and Shank [1][2][3][4][5][6][7][8][9][10][11], distributed feedback dye lasers (DFDLs) have attracted much attention from both theoretical and experimental perspectives. In DFDLs, since the required feedback for lasing is generated by periodic modulation of the refractive index or the gain of the active medium, there is no need to use mirrors [2].…”