Iyo inonzi narrow-band sefa yakakamurwa kubva kubhendi-pass sefa, uye tsananguro yayo yakafanana neyebhendi-pass sefa, ndiko kuti, iyo sefa inobvumira chiratidzo chemaziso kuti chipfuure mune chaiyo wavelength bhendi, uye inotsauka kubva kubhendi-pass sefa.Iwo masaini masaini pamativi ese akavharika, uye passband yenarrowband sefa yakatetepa, kazhinji isingasviki 5% yepakati kukosha kwewavelength.
Basa guru reiyo nhete-bhendi sefa ndeyekupfuura mwenje weimwe wavelength uye kuratidza (kana kudzikisira) zvikamu zvemaziso zvechiedza chemamwe mafungu.Iyo hafu-wave upamhi inowanzodzorwa pa20nm kana pasi, uye inogona kushandiswa mu ultraviolet, mwenje unooneka, pedyo-infrared wavelengths, uye kure-infrared mabhendi.Kambani yedu yakamanikana-bhendi mafirita anoumbwa neakakwira-vacuum evaporation yeakawanda-layer akaomeswa mafirimu uye ion-inobatsirwa deposition yenanomaterials.Yakanaka compactness uye yakakwirira imaging tsananguro.