| light-activated silicon controlled rectifier [`līt ¦ak·tǝ´vād·ǝd ¦sil·ǝ·kǝn kǝn¦trōld `rek·tǝ´fī·ǝr] ELECTRONICS A silicon- controlled rectifier having a glass window for incident light that takes the place of, or adds to the action of, an electric gate current in providing switching action. Abbreviated LASCR. Also known as photo-SCR; photothyristor. |