
Proceedings Paper
Audio communications with a mid-IR laserFormat | Member Price | Non-Member Price |
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Paper Abstract
We have demonstrated audio communications with a mid-IR laser. The laser is a frequency doubled Q-switched CO2
system producing approximately 12ns pulses at 4.6μm. The audio signal was encoded on the beam by means of pulse
frequency modulation (PFM) with a carrier frequency of 37kHz. A 1mm diameter, low noise thermoelectrically cooled
IR photovoltaic detector with electrical bandwidth 250MHz was used to detect the laser beam. A custom-built circuit
stretched the resultant electrical pulses to approximately 1.5μs, before being demodulated. High quality audio signals
were received and recorded, and still images were successfully transmitted using slow scan television techniques.
The demonstration was conducted at the Defence Science & Technology Organisation's laser range at Edinburgh, South
Australia in July 2008. The distance was 1.5km, with a slant path (8m to 1.5m). The maximum range using this system
is estimated to be tens of kilometres.
Paper Details
Date Published: 2 October 2008
PDF: 9 pages
Proc. SPIE 7115, Technologies for Optical Countermeasures V, 71150I (2 October 2008); doi: 10.1117/12.803579
Published in SPIE Proceedings Vol. 7115:
Technologies for Optical Countermeasures V
David H. Titterton; Mark A. Richardson, Editor(s)
PDF: 9 pages
Proc. SPIE 7115, Technologies for Optical Countermeasures V, 71150I (2 October 2008); doi: 10.1117/12.803579
Show Author Affiliations
Kenneth J. Grant, Defence Science and Technology Organisation (Australia)
Bradley A. Clare, Defence Science and Technology Organisation (Australia)
Wayne Martinsen, Defence Science and Technology Organisation (Australia)
Miro Dubovinsky, Defence Science and Technology Organisation (Australia)
Bradley A. Clare, Defence Science and Technology Organisation (Australia)
Wayne Martinsen, Defence Science and Technology Organisation (Australia)
Miro Dubovinsky, Defence Science and Technology Organisation (Australia)
William Isterling, Defence Science and Technology Organisation (Australia)
Daniel Wright, Defence Science and Technology Organisation (Australia)
Kerry A. Mudge, Defence Science and Technology Organisation (Australia)
Daniel Wright, Defence Science and Technology Organisation (Australia)
Kerry A. Mudge, Defence Science and Technology Organisation (Australia)
Published in SPIE Proceedings Vol. 7115:
Technologies for Optical Countermeasures V
David H. Titterton; Mark A. Richardson, Editor(s)
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