Orthogonally polarized dual-wavelength Nd:YLiF4 laser

Abstract

This Letter proposes a method to balance the gain and loss of the orthogonally polarized emissions of dual wavelengths 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 wavelengths with πand σ-polarized emissions from a four-level transition (4 F 3∕2 → 4 I 11∕2 and 4 F 3∕2 → 4 I 13∕2) in Nd 3þ. A simple linear cavity structure is adopted in the experiment, and stable CW orthogonally polarized dual

Temperature-Dependent Stimulated Emission Cross-Section in Nd3+:YLF Crystal

“…Figure 8 depicts the stimulated emission cross-section for the 4 F 3/2 to 4 I 9/2 transition at room temperature and 100 K. The spectrum at room temperature is in reasonable agreement with what Ryan et al [13] obtained through the Judd-Ofelt technique, except for the peak around 863 nm for π-polarization, and the intensity of the peaks at 903 nm and 908 nm are about 70% of the values reported by Zhang [29].…”

High-power and efficient orthogonally-polarized dual-wavelength Nd:YLF laser

“…The output power fluctuations of 1047.4 nm and 1053.4 nm lasers within 60 min were only 1.13% and 0.36%, respectively. Compared with the previous dual-wavelength Nd:YLF laser [2][3][4][5][6], output performances of the orthogonally polarized dual-wavelength laser at 1047 and 1053 nm are significantly improved.…”

“…In recent years, orthogonally polarized dual-wavelength lasers have attracted much attention for their versatile applications in terahertz (THz) radiation generation, laser interferometry, precision metrology, and differential absorption lidar. Since 2009, orthogonally polarized dual-wavelength lasers have been successfully demonstrated in various rare-earthdoped laser crystals such as Nd:GdVO 4 [1], Nd:YLF (LiYF 4 ) [2][3][4][5][6][7], Nd:LuVO 4 [8,9], Nd:YAP (Al 5 O 12 Y 3 ) [10], Nd:YAG (Y 3 Al 5 O 12 ) [11,12], Nd:YVO 4 [13,14], Nd:LLF (LuLiF 4 ) [15], Nd:LMB (LaMgB 5 O 10 ) [16], Yb:KGW (KGd(WO 4 ) 2 ) [17], Yb:CGB (Ca 3 Gd 2 (BO 3 ) 4 ) [18], Yb:GMB (GdMgB 5 O 10 ) [19], and Tm,Ho:LLF [20]. * Author to whom any correspondence should be addressed.…”

“…In the next year, Zhang et al investigated the gain and loss balance of two wavelength lasers by inserting a glass plate into the linear cavity of Nd:YLF laser and adjusting its tilt angle. Finally 8.9 W CW dual-wavelength output power was obtained for a pump power of 18.4 W [4].…”

Actively Q-switched Nd:YLF laser emitting at 908 nm

“…There are three transitions in Nd:YLF crystal: 4 F 3/2 → 4 I 11/2 and 4 F 3/2 → 4 I 13/2 for four-level operation, and 4 F 3/2 → 4 I 9/2 for quasi-three-level operation. The 4 F 3/2 → 4 I 11/2 transition can generate π-polarized 1047 nm emission and σ-polarized 1053 nm emission with a stimulated emission cross sections of 1.8 × 10 −19 and 1.2 × 10 −19 cm 2 , respectively [8]. The 4 F 3/2 → 4 I 9/2 transition can generate π-polarized 903 nm emission and σ-polarized 908 nm emission with the stimulated emission cross sections of 1.2 × 10 −20 and 1.3 × 10 −20 cm 2 , respectively [8].…”