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An optical delay line is used to form a 45-m-long CO2 laser cavity. Continuous locking of the longitudinal cavity modes has been observed with SF6 or BCl3 in the cavity. The laser output is a continuous train of uniform amplitude pulses occurring at 300-nsec intervals. The observed pulse widths of 60–70 nsec correspond to locking five or six modes in a 13- to 18-MHz bandwidth.
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John H. McCoy (1969) studied this question.
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