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We present the use of an optically-pumped saturable absorber (SA) inside Nd:YVO4 and Cr:LiSAF lasers as a viable method to remotely control the laser mode of operation. CW operation in both lasers was obtained by cooling the SAs down to -10degC with a thermo-electric cooler. Two types of the SAs were used: the first one, originally designed as the active region of a semiconductor disk laser, was employed...
Titanium sapphire is a scientific laser of unsurpassed utility. However, the pumping requirements - typically a bulky multiwatt frequency-doubled neodymium laser - do not lend themselves to applications beyond the laser laboratory. In this paper, the design and demonstration of a compact directly diode-laser pumped Ti:sapphire laser is described. In addition, the challenges associated with this approach...
In this paper, we will present our results on different high-power GaSb-based optically pumped semiconductor disk lasers (OPSDLs) emitting in the 1.9-2.8 mum wavelength range, with the emphasis on the power scaling capability of these long-wavelength laser by using the following different concepts: increasing the pumped area, using multiple gain chips and using in-well pumped structures.
We describe a continuous-wave optical parametric oscillator operated within a semiconductor disk laser, free of relaxation oscillations associated with neodymium-based systems. Parametric threshold occurred at 1.4 W primary (diode) pump power and 8.5 W yielded 205 mW idler.
Power scaling by increasing the pump spot area is shown to be intrinsically limited in semiconductor disk lasers with diamond heatspreaders. An output power of 9 W is reported for a 1060 nm device.
The optically-pumped semiconductor disk laser is shown to be a practical low-noise pump source for Cr2+:chalcogenide lasers. Results on cw-pumping of a Cr2+:ZnSe and quasi-cw-pumping of a Cr2+:CdZnTe laser are presented.
The slope efficiency of semiconductor disk lasers is seen to be reduced at high output coupling. Careful adjustment of the cavity and pump mode sizes is also necessary for high efficiency and good beam quality.
Pump power scaling with spot size is studied experimentally and theoretically in a 1060 nm VECSEL with a diamond heatspreader. The dependence of the efficiency and thermal roll-over on pump spot size are discussed.
We report high-performance single-frequency operation of a directly diode pumped GaSb vertical-external-cavity surface-emitting laser (VECSEL) at 2.3 mum. Tunability of >25 nm with a maximum single frequency output of 0.68 W is demonstrated.
An intracavity deformable membrane mirror has been used to control the transverse mode profile of a diode-pumped, grazing-incidence Nd:GdVO/sub 4/ laser. Automatic mode and power optimisation are demonstrated using a closed-loop genetic algorithm.
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