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External-Cavity Diode Lasers (ECDL)

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External-Cavity Diode Lasers (ECDL)

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The laser cavities in our external-cavity diode laser (ECDL) systems and laser modules are the result of many years of experience in designing and manufacturing tunable lasers. Their demonstrated quality and reliability have helped make New Focus the leading supplier of tunable lasers for test and measurement.All New Focus lasers start out as commercially available semiconductor-diode lasers. These diodes typically operate with several longitudinal modes lasing simultaneously, leading to low coherence and large linewidths. To ensure high coherence, we anti-reflection (AR) coat the diodes so they act only as gain elements. The diode can then be placed in an external cavity that contains wavelength-selective optics so that only a single mode lases at any given time.

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