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(a) EL of a typical laser diode below and above threshold and (b) typical curve (inset) and external differential quantum efficiency in external-cavity operation.
Emission spectrum of the external-cavity laser as a function of grating angle. All spectra have been normalized to the same intensity.
EL spectra of the ECL for three different feedback angles with the ECL wavelength longer than (a), equal to (b), and shorter than (c) the FP wavelength.
Threshold current of ECL feedback mode vs wavelength.
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