Image mode laser projection utilizing twisted nematic liquid crystal technology: Model and experiment of amplified spontaneous emission

Details of an image mode projection display are presented that utilize a tw isted nematic display within the cavity of a laser. The reduction in the ou tput efficiency of an image mode laser configuration duc to amplified spont aneous emission is studied both theoretically and experimentally. It was fo und that in order to maximize efficiency, cavity loss should be minimized w hile maximizing the aspect ratio of the gain region and the optical pump ra te.