A simple-narrow linewidth 1.5micron InGaAsP external-cavity laser.
01 January 1986
An external-cavity laser consisting of a 1.5micron wavelength anti-reflection coated DFB laser chip, a microscope objective and a mirror provides a stable, single-frequency, narrow-linewidth (deltaf= 40 kHz) output. Single-longitudinal-mode operation is maintained by the DFB grating and the linewidth is reduced by the extended passive cavity. The external-cavity laser retains the tuning characteristics of the original DFB laser.