激光二极管工作时发出红色激光,波长大约为600～680 nm,可用于 VCD 机、激光打印机、激光测距仪、条形码阅读器等电子设备上。激光发射管称 LD,激光接收管称 PD(实质上是一个光敏二极管),一般常说的激光二极管,实际上是由一只 LD 和一只 PD 封装在一起的复合体,但它只有三个引出脚,其中公共端(COM)通常与封装管子的金属外壳相连。型号和用途不同,LD 和 PD 接公共端的阳极(A)或阴极(K)也不同,有 Laser diode emits red laser when working, the wavelength is about 600 ~ 680 nm, can be used in VCD machines, laser printers, laser range finders, bar code readers and other electronic devices. Laser tube called LD, laser tube called PD (essentially a photodiode), the so-called laser diode, is actually a combination of LD and a PD package together, but it has only three Pinout, where the common terminal (COM) is usually connected to the metal casing that encloses the tube. Different models and uses, LD and PD common end of the anode (A) or cathode (K) is also different, there