Abstract
We design and demonstrate a thermally stable four-mirror discrete-component planar ring cavity for Q-switched laser output. An 880 nm fiber-coupled laser diode is used to pump a-cut Nd:YVO4 directly. A magnetic rotation glass (MR3-2) inserted into a permanent cylinder magnet, in combination with a half-wave plate and the polarized emission properties of Nd:YVO4, is used to obtain unidirectional laser operation. With this setup, for a pump power of 5 W, 2.75 W of continuous 1064 nm single-frequency laser output is obtained. Next, a Cr:YAG with small signal transmittance of 75% is inserted in between the two concave mirrors where the beam waist is located. Consequently, a passive Q-switching single-frequency linear polarization pulse with an average power of 1.02 W, pulse width of 60 ns, frequency of 21 kHz, peak power of 810 W, and single-pulse energy of 48 μJ is obtained. Further, we also propose a new method of using a Fabry–Perot (FP) scanning interferometer to observe high-repetition rate Q-switched pulse output longitudinal-mode signals.
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