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Recently the emission range of waveguide lasers fabricated by fs-laser writing was extended from the infrared to the visible region by employing Pr, Mg:SrAl12O19 as gain material [1]. Due to various transitions in the visible spectral range, Praseodymium allows laser operation from the deep red to the green spectral region [2] and is interesting for many applications, for example in display technology.
Upconversion lasers are unconventional sources of short wavelengths generation: visible radiation can be achieved with the use of infrared pump sources. Er3+-based upconversion lasers can, for example, emit in the green spectral range, when pumped at ∼ 970 nm. Nevertheless, two restrictions have to be observed: non-radiative decay of the emitting manifold must be prevented and a high pump fluence...
In recent years highly efficient waveguide lasers based on femtosecond-laser (fs-laser) written waveguides in crystalline materials could be realized. One approach for the fabrication of waveguiding structures is the inscription of two parallel tracks of modified material with distances in the order of 20 μm and the waveguiding region in between [1, 2, 3]. During the fabrication process the sample...
Using the direct femtosecond-laser writing technique tracks of modified material were written in an Yb(15%):YAG ceramic. Due to a stress-induced change of the refractive index between two parallel tracks waveguiding was achieved in channels between the tracks. Laser oscillation of these channel waveguides at a wavelength of 1030 nm was demonstrated with a maximum output power of 0.7 W. The investigation...
Tracks of modified material were written with femtosecond-laser pulses in neodymium-doped YAG crystals. Due to a stress-induced change of the refractive index, waveguiding beside the tracks and between two adjacent tracks with a distance of approximately 25 μm was observed. Loss measurements resulted in guiding losses of about 1.6 dB/cm for the double track waveguide. Spectroscopic investigations...
The Pulsed Laser Deposition (PLD) technique has several advantages such as the possibility to produce thin films of any compound with a stoichiometric material transfer from the target to the substrate. Also the high energy of the ablated material is a benefit, leading to crystalline film growth due to the high mobility of the atoms on the substrate surface. In combination with a recently demonstrated...
Femtosecond lasers are widely used for three-dimensional volume micro-structuring of dielectric materials. The fabrication of buried channel waveguides inside these materials is interesting especially for the production of passive and active optical devices. The advantages of dielectric waveguide lasers are high optical gain, high damage threshold, and a good overlap between pump mode and laser mode...
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