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The design of an electrodynamic tuning element and its application in a CO2 laser is described. The element is built along the principle of an electrodynamic loudspeaker. It is preferable to the widely used PZT element, particularly at longer wavelength, since it can provide a much larger displacement range.
A novel ultrasonic probe for the measurement of field distributions in water is described. In an arrangement using a metal cone tip as the antenna and an acoustic lens with conventional large diameter transducer as the detector, a spatial resolution of ?/4 was achieved. Experimental results for a 4 MHz design are presented.
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