| http://www.w3.org/ns/prov#value | - A controller generates the etalon tuning signal, receives the detected signal and generates a laser tuning signal based on it, receives the second detected signal and counts peak-valley cycles therein. [0026] Briefly, another preferred embodiment of the present invention is a system for determining the difference in wavelengths of first and second laser beams emitted by first and second tunable la
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