Abstract
We propose and demonstrate an 1123nm Nd:YAG laser by exploiting a dielectric Fabry–Perot band-pass filter as laser output mirror. A fiber-pigtailed 808nm laser diode array is used to pump an <111>-cut Nd:YAG crystal with a plano-plane resonator cavity. The dielectric Fabry–Perot filter as output mirror is specially designed to suppress the strong emission around 1064nm and facilitate the oscillation of 1123nm weak emission. A linearly polarized 1122.5nm laser is achieved. The maximum output power of the laser is 105mW and the slope conversion efficiency is 4.58% with the threshold pump power of 2.9W. Passively Q-switched 1123nm laser is realized using a [100]-cut Cr:YAG crystal as Q-switch. FWHM pulse width of 121ns and pulse repetition rate of 2.3kHz is achieved at pump power of 5.3W. The design principle of the Fabry–Perot filter used as output mirror is discussed and the advantages of the method are summarized.
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