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S4FC is a dedicated control package published by THORLABS Inc. that allows researchers and system integrators to operate the company’s S4FC series of fiber-coupled laser sources from a single Windows interface. The suite combines a full graphical front end with low-level drivers and high-level software development kits written for LabVIEW and C++, giving users the choice of immediate manual control or automated, script-driven experiments. Typical use cases range from precision spectroscopy, interferometry and fiber sensing to calibration of photonic chips and alignment of silicon-photonics test stations, all of which benefit from the stability and narrow linewidth of the S4FC lasers. Because the SDK exposes the same command set used by the GUI, laboratory code can be migrated from prototype to production without hardware changes, while the supplied drivers ensure that Windows treats each laser as a standard plug-and-play USB instrument. Version 2.0.2, the second public release, refines temperature and current loops for lower noise, adds 64-bit LabVIEW support, and streamlines firmware updates through an integrated wizard. Both major versions remain available so that legacy test rigs can be maintained alongside new installations. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources such as winget, always delivering the latest version and supporting batch installation of multiple applications.
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