1,721,213 research outputs found
Crystal waveguide lasers, liquid epitaxy and ion-implantation
No full textFabricating low loss planar waveguides in crystal laser hosts can lead to very large inversion densities for relatively low pump powers due to the confinement of light to small dimensions over longer lengths than normally allowed by diffraction. Thus very high gain per unit pump power amplifiers and very low threshold lasers are made possible. Planar waveguides also allow easy access to the guided wave which can be useful for integrated functions (gratings, modulators etc) and good heat removal in high power devices. Here two methods of producing planar waveguide lasers in a variety of interesting host crystals are discussed
End-pumped passively Q-switched Yb:YAG double-clad waveguide laser
No full textWe present a diode- pumped, double-clad Yb:YAG waveguide laser that maintains an integrated section of Cr4+:YAG saturable absorber for passive Q switching. Using two 4W polarization-coupled, broad-stripe diode-pumped lasers, we obtained 30µJ pulses of 16ns duration at repetition rates of as much as 77 kHz. The slope efficiency was ~50% with respect to absorbed pump power, with a maximum output average power of 2.3 W and a peak power of ~18 kW. The output beam was single lobed, with M2 values as great as 1.5 x 1.3 . We also demonstrate a passively Q-switched Nd:YAG waveguide laser of similar design, operating at 1064 µm and 946 nm
High-power waveguide lasers. (Three-volume set)
No full textAndreas Tu¨nnermann and Holger Zellmer Fibre lasers are based on silica fibres consisting of a rare-earth-doped core with a refractice index n1,
generally surrounded by a pure silica-glass cladding of refractive index n2 < n1, so that waveguiding occurs due to total internal reflection on the interface between core and cladding (see chapter A6 and B4.1). The fibre core serves both as active medium and as waveguide for the pump light and the generated laser light. Due to the long interaction length of pump and laser light the fibre design offers high gain and efficiency [24]
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