A　robust　external　cavity　diode　laser　(ECDL)　based　on　wide　bandwidth　filter　is　fabricated　and　tested.　The　ECDL　demonstrates　a　narrow　Lorentzian　fitted　linewidth　of　95kHz　and　a　spectral　purity　of　2.9MHz.　A　simple　saturation　absorption　spectrum　setup　is　constructed　to　lock　the　ECDL.　Long　term　frequency　stability　of　the　ECDL　reaches　5.59×10-12.　The　852nm　Fabry-Perot　diode　laser　used　in　the　ECDL　is　also　fabricated　and　tested.　The　lateral　mode　of　the　laser　diode　is　analyzed　based　on　finite　difference　method.　The　diode　laser　demonstrates　a　full　width　at　half　maximum　(FWHM)　spectrum　as　low　as　0.31nm　and　a　slope　efficiency　as　high　as　0.66mW/mA.　Low　threshold　and　single　lateral　mode　operation　of　the　diode　laser　have　been　achieved　attributed　to　a　special　dual-grooves　structure.　Good　characteristics　of　the　diode　laser　ensure　the　performance　of　the　ECDL.　A　detailed　description　and　discussion　of　techniques　used　to　characterize　the　frequency　stability　is　provided.　©2017　by　SCITEPRESS　-　Science　and　Technology　Publications,　Lda.　All　rights　reserved.