Laser on single-crystal ZnSe:Fe²⁺with high pulse radiation energy at room temperature

Abstract

A laser on single-crystal ZnSe:Fe2+ was investigated at room temperature. Pumping of the laser was performed by a pulsed electrodischarge HF laser. In experiments, the spot diameter of HF laser radiation incident to the surface of the crystal varied from 5.6 to 17 mm. Generation energy of ~1.2 J was obtained and the efficiency with respect to the energy arriving at the crystal was ηin ≈ 25%. The slope efficiency with respect to the energy absorbed in the crystal at large spot dimensions was ηslope = 45%.

Laser properties of active media based on ZnSe doped with Fe and In from spray pyrolysis deposited films

“…The 130 mm long The values of differential efficiency of Fe:ZnSe active elements with one-sided doping obtained in this work were lower than the maximum values of this parameter (η = 53%) for polycrystalline active elements with bilateral doping [27]. At the same time, the efficiency of these samples is on a par with the efficiency of Fe:ZnSe single crystals [28] and polycrystalline active elements with inner doped layer(s) produced by the CVD technique [29,30] and SSDB. The lasing efficiency of sample #4 produced by diffusion annealing in a zinc atmosphere was significantly lower (ηµ = 25%), that, in our opinion, is associated with the short length of the active region under the given doping conditions, which is confirmed by the distribution profile of the Fe 2+ ion concentration.…”

CVD-grown Fe2+:ZnSe polycrystals for laser applications

“…At present, the possibilities to attain high output energies and average powers have been demonstrated in both single-crystal and polycrystalline Fe 2+ :ZnSe and Fe 2+ :ZnS active media. Pulsed lasing in a Fe 2+ :ZnSe single-crystal laser was obtained with an energy of 10.6 J at a temperature of 85 K [3] and 1.2 J at room temper ature [4]. In [5,6], record-high lasing energies at room temperature were achieved in large-cross-section zinc selenide and zinc sulfide polycrystals diffusion-doped with iron ions.…”

Fe:ZnSe laser pumped by a 2.93- μ m Cr, Er:YAG laser*

“…[4] Up to now, the HF lasers and xenon flash lamp pumped Er:YAG lasers have been the primary pumps for the high energy Fe:ZnSe lasers while the other pumps generated the Fe:ZnSe lasers with the output energy of several millijoules or less. [4] The HF lasers are usually employed as the pumps for short-pulseduration Fe:ZnSe lasers at room temperature, [5][6][7][8][9][10][11][12] and the Fe:ZnSe lasers and the pump both have the pulse durations of 100 ns-200 ns. For high energy Fe:ZnSe lasers with long pulse duration, the free-running 2.94-µm Er:YAG lasers at low temperature are the efficient pumps which have the pulse durations of several hundreds of microseconds.…”