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External-cavity diode lasers (ECDL) are widely used as light sources in laserspectroscopy, atomic physics, and quantum optics. This study demonstrated ahome-made 852-nm ECDL with variable feedback, using the combined dualnarrow-band interference filters (IFs) as the laser longitudinal mode selectionelement. The combination of narrow-band IFs, mainly for the currentcommercially available narrow-band IFs with the full width at half maximum(FWHM) of approximately 0.5 nm for 780-895 nm. We designed differentnarrow-band IFs combinations to achieve a narrower FWHM, and applied them inthe ECDL. The combination of the dual narrow-band IFs further reduces the laserlinewidth. We measured the laser linewidth using a high-finesse Fabry-Perotcavity with a linewidth of approximately 10 kHz. The laser linewidth isapproximately 176 kHz for the Single-IF-ECDL and 96 kHz for the Dual-IF-ECDLwith the same feedback. In addition, we have experimentally verified theresults of narrower laser linewidth and larger tuning range with increase inthe feedback. The developed Dual-IF-ECDL has the capability of narrow linewidthand wavelength tunability and can be applied to precision spectroscopy, coolingand trapping of neutral atoms.

Interference filter based external-cavity diode laser with combined dual interference filters and largely adjustable feedback range