Pengbo Jiang

5.2-W high-repetition-rate eye-safe laser at 1525 nm generated by Nd:YVO 4 –YVO 4 stimulated Raman conversion

We report herein an efficient eye-safe Raman laser, which is based upon Nd:YVO₄₋YVO₄ and in-band pumped by a wavelength-locked laser diode array at 878.6 nm. By virtue of mitigated thermal load and improved pump absorption, a maximum average output power of 5.2 W at 1525 nm is obtained under the incident pump power of 30.6 W with the pulse repetition frequency of 140 kHz, corresponding to an optical efficiency of 17.0%.

12.45 W wavelength-locked 878.6 nm laser diode in-band pumped multisegmented Nd:YVO 4 laser operating at 1342 nm

A multisegmented Nd:YVO4 laser operating at 1342 nm that is in-band pumped by a wavelength-locked 878.6 nm laser diode is reported here. We achieve an output power of 12.45 W at 1342 nm for an absorbed pump power of 35.6 W, corresponding to an optical-to-optical efficiency of 34.9% and a slope efficiency of 36.1%. To the best of our knowledge, it is the highest optical-to-optical efficiency of Nd:YVO4 lasers operating at 1342 nm with an output power more than 10 W.

Efficient Eye-Safe Nd:YVO 4 Self-Raman Laser In-Band Pumped at 914 nm

An efficient Q-switched eye-safe Nd:YVO4 self-Raman laser, which we believe to be the first one in-band pumped at 914 nm, is presented, and 2.58 W of 1525-nm Stokes output was generated under the absorbed pump power of 10.2 W with a high repetition rate of 100 kHz, corresponding to a conversion efficiency of 25.3%. The optical efficiency with respect to incident pump also reached 16.4%. Influences of crystal temperature and dopant concentration on the performance of the eye-safe self-Raman laser were experimentally investigated.

Efficient Nd:YVO4 self-Raman laser in-band pumped by wavelength-locked laser diode at 878.7 nm

A frequency-doubled Nd:YVO4 self-Raman laser in-band pumped by an 878.7 nm wavelength-locked laser diode (LD) is demonstrated, with the purpose of improving the pump absorption of in-band pumping and thus enhancing optical efficiency. 2.64 W average output power at 588 nm is obtained under incident LD power of 9.7 W, corresponding to an optical efficiency of 27.2%. The results of control experiments show that in-band pumping leads to higher conversion efficiency of a self-Raman laser than does traditional pumping. Moreover, the application of a wavelength-locked LD further improves optical efficiency significantly.

980-W and 054-mJ actively Q-switched Nd:YAG/Nd:YVO_4 hybrid gain intracavity Raman laser at 1176 nm

Here we propose an efficient diode-end-pumped actively Q-switched 1176-nm Nd:YAG/Nd:YVO4 hybrid gain intracavity Raman laser. By virtue of the construction of a coaxial double crystal, the laser not only can operate efficiently at low pulse repetition frequencies (PRFs), thereby realizing relatively high-energy and high-peak-power pulsed output, but also is capable of generating a high average output power at high PRFs. A maximum pulse energy of 0.54 mJ for the 1176-nm Stokes light is achieved at the PRF of 10 kHz, and the maximum average output power up to 9.80 W is obtained at the PRF of 100 kHz, while the incident pump power is 42.0 W.

Efficient 914-nm Nd:YVO 4 laser under double-end polarized pumping

We report herein the enhancement of output power and optical efficiency of a quasi-three-level Nd:YVO₄ laser through a double-end polarized pumping scheme, which improves the usually insufficient pump absorption of the short laser gain medium with low doping concentration, and meanwhile alleviates the influence of thermal effect. 17.7 W laser output at 914 nm is obtained under the launched 808-nm pump of 53.0 W, corresponding to an optical efficiency of 33.4%.

Thermal Management of Nd:YVO 4 Laser by 808-/880-nm Dual-Wavelength Pumping

Here, we present a thermal load model of a Nd:YVO4 laser under dual-wavelength pumping. Pumping the gain medium with both traditional and in-band pump light in adjustable proportion, the design takes full advantage of high efficiency and low heat of the two pump schemes, and the thermal load can be controlled actively, thus being capable of achieving optimal laser performance allowed under certain restrictions. The range of optimal proportion under different restrictions is discussed. Experimental results of a Nd:YVO4 laser under 808-nm and 880-nm dual-wavelength pumping validated the theoretical analysis.

Efficient yellow-light generation based on a Q-switched frequency-doubled self-Raman laser

Efficient 588-nm yellow laser with high pulse energy and peak power is generated based on an intracavity frequency doubled Q-switched Nd:YVO4 self-Raman laser. The cavity is elaborately designed to ensure high conversion efficiencies in both Raman and second harmonic generation processes, and meanwhile mitigate the thermal load deposited in gain medium so as to help improve power scalability. At the pulse repetition frequency of 60 kHz, 6.33 W of 588-nm yellow output is obtained under 30.3-W incident pump. The pulse energy of 167 μJ and peak power of 33.4 kW are also obtained at 30 kHz.

Generation of high-output yellow light by intracavity doubling Nd:YAG-Nd:YVO4 hybrid gain Raman laser

A promising method for generation of relatively high-peak-power and high-energy yellow light based on doubling actively Q-switched Nd:YAG-Nd:YVO4 hybrid gain intracavity Raman laser at 1176 nm has been proposed and experimentally demonstrated for the first time. Under the incident pump power of 42.0 W, pulse energy of 0.37 mJ and peak power of 75 kW at 1176 nm were generated in our experiment.