A basic 3D printer, also known as a fabricator or “fabber”, now costs less than a laser printer did in 1985.
一台简单的3D打印机（又名“编织机”），现在比1985年的激光机还便宜。
Figure I. 1 shows a basic laser diode chip which consists of two cleaved parallel facets and two sawed (roughened) sides.
图。1所示的是由两个平行解理面和二个锯出的(粗糙)侧面组成的激光二极管的管芯。
Laser is the basic element for application of laser technologies.
激光器是激光技术应用的基础。
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