Mode Locking and Ultrashort Pulses

  • Richard A. Phillips
Part of the Optical Physics and Engineering book series (OPEG)


In this section the influence of the relative phases of modes on the output waveform and on the operation of a laser will be considered. Previously it was shown that the operating frequencies of a laser are to first order determined by the cavity resonances and longitudinal modes (TEM00q) are separated in frequency by Δv = c/2Ln, where L is the cavity length and n is the index of refraction of the medium. We will see that when the phases of the modes are locked the output consists of a series of pulses. In an absorbing medium the pulse velocity has been measured as greater than c. From solid-state lasers pulses on the order of 10–11 sec have been observed.


Peak Power Saturable Absorber Round Trip Time Pulse Velocity Ultrashort Pulse 
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Copyright information

© Plenum Press, New York 1972

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  • Richard A. Phillips

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