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

Abstract

The generation of a single and stable picosecond pulse by distributed feedback dye laser is investigated in this work. The numerical result for the rate equation system that includes the thermal effects in the lasing medium is provided. By applying this model to Rhodamine 6G, it is found that considerable improvement in the stability of the laser can be achieved by pumping the system with narrower laser pulses. The simulation shows that if the dye solution is pumped by sub-200 ps pulse, the laser can be operated in single-pulse output mode with acceptable stability in pulsewidth over a long range of pumping intensity. This result is confirmed by a more complicated model composed of non-averaged Maxwell and rate equations. Even though the thermal effects do not play a significant role in equivalent cavity lifetime, they result in considerable wavelength shift toward the shorter wavelengths.

Picosecond Pulse Generation by Second-Order Distributed Feedback Dye Laser

“…In this study, we investigated the influence of the pumping energy on the laser pulse width by changing the ratio γ = E p /E thr (here E p -pumping energy and E thr -threshold energy). Normally, the output laser from DFDL at the high γ is a train of pulses with different pulse-width [6]. In the second-order regime, the multiple output direction is observed during laser operation.…”

Tunable co-doped dye laser of coumarin 440 and coumarin 460

“…After the first successful demonstration of the tunable dye laser in 1967 [1], the dye laser was rapidly developed into an extremely versatile tunable light source for the spectral region between 360 nm and 750 nm and has since found almost universal application [2,3].…”

Broadband emission and flat optical gain glass containing Ag aggregates for tunable laser

“…At present, the tunable lasers with output wavelengths in visible region can be achieved from dye lasers, optical parametric oscillators (OPO), and super continuum light sources. Among these tunable lasers, the operation of tunable dye lasers lie on liquid dye media, which are unpopular in the practical applications due to worse stability of the dyes and weak mobility and compactness; the OPO lasers are of all‐solid state, but their stability is weak and cost is much high; the super continuum light sources are not real lasers, their output is composed of broadband quasi white light, and their cost is also high . Therefore, broadband and tunable lasers have become a hot spot in the research of novel laser sources .…”