We report for the first time, to our knowledge, the diode-pumped continuous-wave(CW) thin-disk Yb3+-doped Lu2O3(Yb:LO) laser at 1 034 nm and the second-harmonic generation at 517 nm. With a 6.3% output coupler, the maximum output power is 1.17 W under a pump power of 18.5 W. Moreover, the intracavity second-harmonic generation(SHG) is also achieved with power of 193 mW at 517 nm by using an LiB3O5(LBO) nonlinear crystal. The beam quality factor M2 is about 1.28. The fluctuation of the output power is about 3% in 1 h.
This Letter proposes a method to balance the gain and loss of the orthogonally polarized emissions of dual wave- lengths in a solid laser cavity. By adjusting the tilt angle of the uncoated glass plate inserted into the cavity, the gain and loss of the orthogonally polarized emission lines with small intervals can be balanced to equalize the oscillation thresholds of the orthogonally polarized dual wavelengths. We select the birefringent crystal Nd：LiYF （Nd：YLF） as the gain media, and theoretically analyze the simultaneous oscillation conditions of dual wave- lengths with π- and σ-polarized emissions from a four-level transition （^4F3/2 →^4I11/2 and ^4F3/2 → 4I13/2） in Nd^3＋. A simple linear cavity structure is adopted in the experiment, and stable CW orthogonally polarized dual-wavelength laser outputs of 1047, and 1053, 1321, and 1313 nm are obtained.
