Hybrid ECL/DBR wavelength & spectrum stabilized lasers demonstrate high power & narrow spectral linewidth

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Semiconductor diode based External Cavity Lasers (ECLs) that utilize spectrally filtered feedback to select the specific laser operating wavelength have been a core component in many precision systems, and can be found in many application areas ranging from Raman spectroscopy sources to fiber optic communications links. Traditional diode based ECL technologies rely on surface gratings (ruled or holographic) or on Bragg gratings located within the optical fiber (commonly referred to as Fiber Bragg Gratings or FBGs). These techniques have the advantage of being able to select a desired operating wavelength, however, they exhibit large wavelength shifts as a function of temperature and therefore require the use of Thermo Electric Coolers (TECs) to accurately maintain “lock” on the desired operational wavelength.