areas. Thermal crosstalk, whereby the wavelength of one laser is affected by the current flowing in its neighbours, is dependent on the spacing between adjacent lasers and the effectiveness of the heatsinking under the laser array. We measured less than O.lnm of wavelength change when current in an adjacent laser was changed by 80mA. Electrical crosstalk was minimised by careful design and layo...

We report laser operation of a multistripe array grating integrated cavity (MAGIC) laser in which the wavelength of the emission from a single output stripe is chosen by selectively injection pumping a second stripe. We demonstrate a device that lases in the 1.5 pm fiber band at 15 wavelengths, evenly spaced by -2 nm. The single-output/wavelength-selectable operation, together with the accurate...

A method for producing a laser guide star wavefront sensor for adaptive optics with reduced focal anisoplanatism is presented. A theoretical analysis and numerical simulations have been carried out and the results are presented. The technique, named SPLASH (Sky-Projected Laser Array Shack-Hartmann), is shown to suffer considerably less from focal anisoplanatism than a conventional laser guide s...