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直接二极管激光

A direct diode laser (DDL), as the name implies,  is a laser originating from  diodes without amplification in a crystal such as Nd:YAG. Since it is direct, the diode laser has a very simple construction and high conversion efficiency.  It is MUCH more efficient than an Nd:YAG laser.  The typical operating wavelength of a direct diode laser is 915 nm.
 
直接二极管激光与Nd:YAG的效率对比