DFB-Lasers / DBR-Lasers / RWS-Lasers Single Frequency Laser Diodes have a wavelength-selective grating integrated in the laser chip. Thus they operate on a single resonator mode emitting quasi-monochromatic radiation with a very small linewidth and low phase noise. The lasers can have very low-intensity noise because of the lack of mode partition noise. Due to the Gaussian mode the output is diffraction-limited.TEST

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