A linearly polarized 1123 nm Nd:YAG laser using a Fabry-Perot filter as output mirror

摘要

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