Analysis and Optimization of a Q-Switched Erbium Doped Fiber Laser Working with a Short Rise Time Modulator

Characteristics of Q-switched cladding-pumped ytterbium-doped fiber lasers with different high-energy fiber designs

“…A time-independent analysis of the system, including ASE, between pulses is then sufficient. We use a simple model with a single wavelength for the ASE and signal, similar to the one described in [14] (7) (8) (9) (10) (11) Here, and are the upper and lower level population densities (ion/m ), is the pump power (the pumping is uni-directional), is the signal power, co-( ) and counter-propagating ( ) relative to the pump, is the ASE bandwidth, the number of transverse modes excited in the cavity (excluding polarization degeneracy), is the lifetime of the upper laser level, and are the pump and signal overlaps with the doped area. The last term in equation (8) represents the spontaneous emission that seeds the ASE, considering the same ap-proximation as in [14] for coupling of spontaneous emission into guided core modes.…”

Q-Switch Modulator as a Pulse Shaper in Q-Switched Fiber Lasers

“…Let us first discuss the pulse formation upon classical QS that was discussed in details in prior theoretical works (see, for example, Refs. [6], [7]). If the step voltage is applied to the AOM driver ( Fig.…”

Comparison of high-power diode pumped actively Q-switched double-clad flower shape co-doped-Er3+:Yb3+fiber laser using acousto-optic and mechanical (optical) modulators

“…The use of the AOM for Q-switching of the Er 3+ :Yb 3+ glass laser is for several reasons: the modulators are commercially available; they can be made very compact and with very low insertion losses and as such are compatible with the low-gain Er 3+ :Yb 3+ glass microchip lasers [24,26]. In this arrangement, the undeflected beam is fed back into the fiber by the butted output coupler mirror.…”

“…The beam was collimated and then passed through an optical isolator to prevent back reflections from the input fiber end damaging the high-power diode laser module. The pump radiation was focused into the Er 3+ :Yb 3+ fiber through a dichroic input high-reflection mirror, which was 98% reflecting at 1550 nm and 90% transmitting at 980 nm [18][19][20][21][22][23][24]. A.F.…”