A continuous wave (CW) frequency-doubled and frequency-stabilized laser with red light output was designed and built. The laser resonator is in a ring configuration consisting of four mirrors, and a YVO4-Nd:YVO4 composite crystal end-pumped by a laser-diode serves as the laser material. A type-I critical phase-matched (CPM) LBO crystal and an optical diode constituted by a TGG and a λ/2 waveplate are placed inside the resonator to be used for the intracavity frequency-doubler and for forcing the laser to operate unidirectionally, respectively. The optical resonator is designed to satisfy the conditions of the thermal insensitivity and the optimum frequency-doubling. Under the pumped power of 19 W, the single-frequency second-harmonic-wave output of 610 mW at 671 nm wavelength and the fundamental laser output of 400 mW at 1342 nm are obtained, simultaneously. The intensity fluctuation of the output red laser is less than ±0.6% in 30 minutes. With and without the frequency-stabilizing servo system on, the laser frequency shifts at 1342 nm wavelength are better than ±1 MHz and ±5 MHz within 1 minute, respectively.