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A mode-locked laser is capable of emitting extremely short pulses on the order of tens of picoseconds down to less than 10 femtoseconds. These pulses will repeat at the round trip time, that is, the time that it takes light to complete one round trip between the mirrors comprising the resonator.
Several modes of ultrasound are used in medical imaging. These are: 1  A-mode: A-mode (amplitude mode) is the simplest type of ultrasound. 2  A single transducer scans a line through the body with the echoes plotted on screen as a function of depth.