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A gallium antimonide-based semiconductor disk laser (SDL) emitting 17 W of continuous wave output power at a heat sink temperature of 20°C and an emission wavelength of 2.02 μm are presented. This high-output power is achieved by optimising the thermal management and reducing the quantum deficit of the SDL structure.

A vibrating coil magnetometer has been developed which provides precise and continuous indication of the strength of a magnetic field. The device is used on a sector mass spectrometer to obtain both visual mass indication and spectra calibration in the mass range of 2–400.

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