TWO CAVITY MODE-LOCKING OF A He–Ne LASER

Abstract
Complete mode‐locking of a He–Ne laser has been achieved using an electro‐optic phase modulator driven at the c/2L frequency of the laser cavity and situated near one end of a passive cavity which was strongly coupled to the active cavity. This technique permits the use of modulator crystals which are too lossy for intracavity operation and results in shorter pulses than can be obtained with conventional intracavity techniques.

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