- Conference date: 19-23 June 2006
- Location: Greenbelt, Maryland (USA)
We discuss a polarisation‐based homodyne interferometer under development at the University of Birmingham that has shown promising sensitivities down to 10−4 Hz. A compact interferometer, measuring 87 × 40 × 25 mm, has been fabricated that employs a VCSEL laser diode source operating at 850 nm. The VCSEL has been fully characterised and has demonstrated mono‐mode behaviour over a wavelength tuning range of 1.5 nm. This provides the option of adopting a wavelength modulation technique, which will enable the absolute difference in interferometric arm‐lengths to be determined. We have demonstrated a displacement sensitivity of 10−8 m/Hz1/2 at 10−3 Hz.
- Vertical cavity surface emitting lasers
- Laser diodes
- Optical fabrication
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