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Unstable Resonators

GSI Lumonics Excimer lasers with unstable resonator opticsUnstable resonator optics are available to provide low divergence for applications requiring long distance propagation of the beam or the highest focussability. A significant improvement to spatial coherence is also obtained, which is beneficial in some applications involving the use of diffractive optics (e.g. FBG writing, DOE hole drilling).
The beam is flat topped in both axes, with no occlusions, for divergence of <300 microradians

The LightMachinery staff have been world leaders in excimer lasers for over 25 years and we will continue to lead the way with improvements and refinements to excimer laser technology.

Unstable Resonator Performance

GSI Lumonics Excimer lasers with unstable resonator optics Beam profile at the focal plane of a one meter lens. Beam divergence is approximately 230 micro-radians FWHM in both axes.
GSI Lumonics Excimer lasers with unstable resonator optics Interference pattern generated from a pair of slits seperated by 0.3mm demonstrating the spatial coherence of the unstable resonator configuration.
GSI Lumonics Excimer lasers with unstable resonator optics

Fringe Visibility (FV)

FV = Peak Intensity - Base intensity
        Peak Intensity + Base Intensity

GSI Lumonics Excimer lasers with unstable resonator optics Fringe visibility versus beam displacement using a shearing interferometer.
GSI Lumonics Excimer lasers with unstable resonator optics
10 mm x 24 mm beam size at FWHM.
GSI Lumonics Excimer lasers with unstable resonator optics Divergence less than 300 microradians.
GSI Lumonics Excimer lasers with unstable resonator optics 70% of stable resonator power in near field.

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