Theeffectsofvacuum-inducedcoherence(VIC)onthepropertiesoftheabsorptionandgainoftheprobefieldinanequispacedthree-levelladderatomicsystemareinvestigated.Itisfoundthatlasingwithoutinversion(LWI)isremarkablyenhancedduetotheeffectofVICinthecaseofthesmallincoherentpumprate.