Y.F. Lü

All-solid-state cw sodium D2 resonance radiation based on intracavity frequency-doubled self-Raman laser operation in double-end diffusion-bonded Nd3+:LuVO4 crystal.

We report for the first time (to our knowledge) cw orange-yellow emission at 589 nm from a compact double-end diffusion-bonded Nd(3+):LuVO(4) self-Raman laser with intracavity frequency doubling in LiB(3)O(5), pumped by an 880 nm diode laser. A 3.5 W cw orange-yellow emission with an overall diode-to-visible conversion efficiency of 13.3% is achieved through the use of an 18-mm-long double-ended diffusion-bonded Nd(3+):LuVO(4) crystal. The M(2) factors are 1.35 and 1.74 in both the horizontal and vertical dimensions, respectively.

Diode-pumped cw Nd:YAG three-level laser at 869 nm

We report for the first time (to our knowledge) a diode-pumped Nd:YAG laser emitting at 869 nm based on the (4)F(3/2)-(4)I(9/2) transition, generally used for a 946 nm emission. Power of 453 mW at 869 nm has been achieved in cw operation with a fiber-coupled laser diode emitting 35.4 W at 809 nm. Intracavity second-harmonic generation in the cw mode has also been demonstrated with power of 118 mW at 435 nm by using a BiB(3)O(6) nonlinear crystal. In our experiment, we used a LiNbO(3) crystal lens to complement the thermal lens of the laser rod, and we obtained good beam quality and high output power stability.

Diode-Pumped Nd:YVO4-Nd:YLF Blue Laser at 488 nm by Intracavity Sum-Frequency-Mixing

We report a laser architecture to obtain continuous-wave blue radiation at 488 nm. A 808 nm diodepumped the Nd:YVO4 crystal emitting at 914 nm. A part of the pump power was then absorbed by the Nd:YVO4 crystal. The remaining was used to pump the Nd:YLF crystal emitting at 1047 nm. Intracavity sum-frequency mixing at 914 and 1047 nm was then realized in a LBO crystal to reach the blue radiation. We obtained a continuous-wave output power of 514 mW at 488 nm with a pump laser diode emitting 19.6 W at 808 nm.

Diode-pumped Nd:LuVO4-Nd:YVO4 laser at 492 nm with intracavity sum-frequency-mixing in LiB3O6

We present for the first time a Nd:YVO4 laser emitting at 1064 nm intracavity pumped by a 916 nm diode-pumped Nd:LuVO4 laser. A 809 nm laser diode is used to pump the Nd:LuVO4 crystal emitting at 916 nm, a Nd:YVO4 laser crystal was pumped at 916 nm and lased at 1064 nm. Intracavity sum-frequency mixing at 916 and 1064 nm was then realized in a LiB3O6 (LBO) crystal to reach the blue range. We obtained a continuous-wave output power of 216 mW at 492 nm under 19.6 W of incident pump power at 809 nm.

Quasi-three-level Nd:YVO4 laser by diode pumping at 888 nm

We report efficient laser emission on the 914 nm 4F3/2 to 4I9/2 transition in Nd:YVO4 under the pump with diode lasers at 888 nm for the first time. Continuous wave 6.57 W output power at 914 nm is obtained from a V-type resonator under 18.3 W of absorbed pump power; the slope efficiency with respect to the absorbed pump power was 60.6%. Moreover, intracavity frequency doubling with BiB3O6 (BiBO) nonlinear crystal yielded 1.77 W of deep-blue light at 457 nm with beam quality characterized by an M2 factor of 1.25.

All-solid-state cw frequency-doubling Nd:YLiF4/LBO blue laser with 4.33 W output power at 454 nm under in-band diode pumping at 880 nm

We generated efficient blue laser output at 454 nm by intracavity frequency doubling of a continuous-wave (cw) diode-pumped Nd:YLiF(4) (Nd:YLF) laser at 908 nm based on the (4)F(3/2)-(4)I(9/2) transition. With 32.8 W of incident pump power at 880 nm and the frequency-doubling crystal LiB(3)O(5), a level as high as 4.33 W of cw output power at 454 nm is achieved, corresponding to an optical conversion efficiency of 13.2% with respect to the incident pump power. To the best of our knowledge, this is the first blue laser at 454 nm generated by intracavity frequency doubling of a diode-pumped Nd:YLF.

Quasi-three-level neodymium-doped yttrium aluminum garnet laser emitting at 885 nm

We present a diode-pumped quasi-three-level neodymium-doped yttrium aluminum garnet (Nd:YAG) laser at 885 nm, based on the 4F3/2-4I9/2 transition, generally used for a 946 nm emission. Combined with polarization components (Nd:YAG), the electro-optical crystal KH2PO4 (KDP) formed a Lyot filter in the cavity and compressed the available gain bandwidth. With an incident pump power of 9.2 W, a 714 mW continuous-wave (CW) output at 885 nm was achieved, and the optical-to-optical efficiency was 7.8%. With an adjustable voltage applied to the KDP crystal, the laser wavelength could be tuned from 885 nm to 884 nm. A simultaneous dual-wavelength Nd:YAG laser at 885 nm and 884 nm was also realized by adjusting the free spectral range of the Lyot filter. To our knowledge, it is the first study that has realized the tuning between the 884 and 885 nm lines and the simultaneous dual-wavelength CW laser operation at 885 nm and 884 nm.

Diode-pumped orthogonally polarized Nd:LuVO 4 lasers based on the 4 F 3/2 – 4 I 11/2 transition

A diode-pumped simultaneous orthogonally polarized continuous-wave (cw) dual-wavelength Nd:LuVO4 laser based on the F-4(3/2) - I-4(11/2) transition is experimentally demonstrated. A theoretical analysis has been introduced to determine the threshold conditions for simultaneous orthogonally polarized dual-wavelength laser. Using a polarization beam splitter included resonant cavity in the experiments, simultaneous orthogonal polarized dual-wavelength Nd:LuVO4 laser operation was realized at two close wavelengths near 1060-1070 nm. To our knowledge, this is the first work of realizing simultaneous dual-wavelength Nd:LuVO4 laser operation near 1060-1070 nm

Diode-Pumped Quasi-Three-Level

A diode-end-pumped quasi-three-level orthogonally polarized continuous-wave dual-wavelength Nd:YVO4 laser was demonstrated. We analyze the condition of gain-to-loss balance via an uncoated glass plane to achieve the simultaneous dual-wavelength operation. We experimentally demonstrate the orthogonally polarized dual-wavelength laser with a Nd:YVO4 crystal. The simultaneous dual-wavelength Nd:YVO4 laser at 914 nm in π-polarization and 915 nm in σ-polarization is realized. At an incident pump power of 12 W, the output power obtained at 914 and 915 nm is 1.19 and 0.86 W, respectively. To the best of our knowledge, this is the first work realizing quasi-three-level orthogonally polarized dual-wavelength operation in Nd-doped lasers.

{\rm Nd}{:}{\rm YVO}_{4}

We present what is, to the best of our knowledge, the first diode-pumped Nd:LuVO(4) laser emitting at 1089 nm, based on the (4)F(3/2)-(4)I(11/2) transition, generally used for a 1066 nm emission. A power of 8.7 W at 1089 nm has been achieved in continuous-wave (cw) operation with a fiber-coupled laser diode emitting 18.7 W at 809 nm. Intracavity second-harmonic generation in cw mode has also been demonstrated with a power of 3.6 W at 544.5 nm by using a LiB(3)O(5) nonlinear crystal.