Diode-pumped Nd:LGS laser emitting at 888 nm

We present what is, to the best of our knowledge, the first diode-pumped Nd:La₃Ga₅SiO₁₄ (Nd:LGS) laser emitting at 888 nm, based on the ⁴ F _3/2-⁴ I _9/2 transition, generally used for a 904 nm emission. The use of a pump module with 16 passes through the crystal allowed the realization of a Nd:LGS thin-disk laser with 1.41 W of continuous wave (cw) output power at 888 nm. Moreover, intracavity second-harmonic generation (SHG) in cw mode has also been demonstrated with a power of 221 mW at 444 nm by using a BiB₃O₆ (BiBO) nonlinear crystal.     

Diode-pumped Nd:LGS intracavity-doubled green laser at 532 nm

It is reported that efficient continuous-wave (CW) green laser generation at 532 nm in a KTP crystal at type-II phase matching direction performed with a diode-pumped Nd:LGS laser. With incident pump power of 18.2 W, output power of 2.68 W at 532 nm has been obtained using a 5 mm-long KTP crystal. The optical conversion efficiency was up to 14.7%. At the output power level of 2.68 W, the output stability is better than 3.5%. The beam quality M ² values were equal to 1.33 and 1.19 in X and Y directions, respectively.     

LD泵浦Nd:YVO4/LBO单频671 nm激光器

利用半导体激光器(LD)端面抽运位于四镜环行腔中的Nd:YVO4晶体,保证激光器单频运转的腔内光学单向器由TGG和λ/2波片构成.腔内倍频晶体选用Ⅰ类临界相位匹配LBO晶体,我们获得了输出功率为360 mW,波长为671 nm的单频红光.     

Diode-pumped Nd:GAGG-LBO laser at 531 nm

We report a green laser at 531 nm generation by intracavity frequency doubling of a continuous wave (cw) laser operation of a 1062 nm Nd:GAGG laser under in-band diode pumping at 808 nm. A LiB₃O₅ (LBO) crystal, cut for critical type I phase matching at room temperature is used for second harmonic generation of the laser. At an incident pump power of 18.5 W, as high as 933 mW of cw output power at 531 nm is achieved. The fluctuation of the green output power was better than 3.5% in the given 4 h.     

Diode-pumped quasi-three-level Nd:CLNGG laser at 928 nm

We describe the output performances of the 928 nm ⁴ F _3/2 → ⁴ I _9/2 transition in Nd:CLNGG under diode-laser pumping. An end-pumped Nd:CLNGG crystal yielded 1.3 W of continuous-wave output power for 17.8 W of absorbed pump power. The slope efficiency with respect to the absorbed pump power was 11.2%. Furthermore, with 17.8 W of diode pump power and the frequency-doubling crystal LiB₃O₅ (LBO), a maximum output power of 260 mW in the blue spectral range at 464 nm has been achieved. The blue output power stability over 4 h is better than 3.2%.     

Diode-pumped continuous-wave Nd:YLF laser at 1313 nm

We present an efficiency Nd:LiYF₄ (Nd:YLF) laser operating at 1313 nm pumped directly into the emitting level ⁴ F _3/2. At the incident pump power of 10.3 W, as high as 3.1 W of continuous-wave output power at 1313 nm is achieved. The slope efficiency with respect to the incident pump power was 36.1%. To the best of our knowledge, this is the first demonstration of such a laser system. Comparative results obtained for the pump with diode laser at 806 nm, into the highly absorbing ⁴ F _5/2 level, are given in order to prove the advantages of the 880 nm wavelength pumping.     

Diode-pumped continuous-wave eye-safe Nd:YAG laser at 1415 nm

We describe the output performance of the 1415 nm emission in Nd:YAG in a plane-concave cavity under traditional pumping into the 4F5/2 level (808 nm) and direct in-band pumping into the 4F3/2 level (885 nm). An end-pumped Nd:YAG laser yielded maximum cw output power of 6.3 W and 4.2 W at 885 nm and 808 nm laser diode (LD) pumping, respectively. To the best of our knowledge, this is the highest output power of a LD-pumped 1415 nm laser.     

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:YCOB self-frequency-doubling green laser at 530 nm

It is reported that efficient continuous-wave (CW) self-frequency-doubling green laser at 530 nm performed with a diode-pumped Nd³⁺:YCa₄O(BO₃)₃ (Nd:YCOB) laser. With a diode pump power of 14.3 W, TEM₀₀ mode green laser at 530 nm of 1.07 W is obtained. At the output power level of 1.07 mW, the output stability is better than 5%. The beam quality M² value is about 1.37. To the best of our knowledge, this is the highest power laser at 530 nm generated by self-frequency doubling of a diode pumped Nd:YCOB laser.     

Diode-pumped Nd:YCOB self-frequency-doubling blue laser at 468 nm

We report a continuous-wave (CW) self-frequency-doubling blue laser at 468 nm by a diodepumped Nd³⁺:YCa₄O(BO₃)₃ (Nd:YCOB) laser. With 14.3 W of diode pump power, a maximum output power of 211 mW in the blue spectral range at 468 nm has been achieved. The beam quality M² values were equal to 1.16 and 1.23 in X and Y directions, respectively. The output power stability over 30 min is better than 5%. To the best of our knowledge, this is the highest power laser at 468 nm generated by self-frequency doubling of a diode pumped Nd:YCOB laser.     

Diode-pumped Nd:YCOB self-frequency-doubling red laser at 666 nm

It is reported that efficient continuous-wave (CW) self-frequency-doubling red laser at 666 nm performed with a diode-pumped Nd³⁺:YCa₄O(BO₃)₃ (Nd:YCOB) laser. With a diode pump power of 14.3 W, TEM₀₀ mode red laser at 666 nm of 570 mW is obtained. At the output power level of 570 mW, the output stability is better than 3.5%. The beam quality M² value is about 1.25. To the best of our knowledge, this is the highest power laser at 666 nm generated by self-frequency doubling of a diode pumped Nd:YCOB laser.     

Diode-pumped 671 nm laser frequency doubled by CPM LBO

A design of diode-pumped high-efficiency Nd:YVO₄/LBO red laser is reported. Using critical phase-matching (CPM) LBO, 671 nm red laser was obtained from 1342 nm light by intracavity frequency doubling. With an incident pump laser of 800 mW, using type-I and type-II CPM LBO, 97 and 52 mWTEM₀₀ mode red laser outputs were obtained, with optical-to-optical conversion efficiencies of up to 12.1% and 6.5%, respectively.     

Diode-pumped Nd:YAG laser emitting at 899 nm and below

We present what is, to the best of our knowledge, the first diode-pumped Nd:YAG laser emitting at 899 nm and below, based on the (4)F(3/2) - (4)I(9/2) transition, generally used for a 946 nm emission. A power of 630 mW at 899 nm has been achieved in cw operation and 16 mW at 884 nm with a fiber-coupled laser diode emitting 9 W at 808 nm. Intracavity second-harmonic generation in cw mode has also been demonstrated with a power of 100 mW at 450 nm by using a LiB(3)O(5) nonlinear crystal.     

Diode-pumped Nd:GGG laser at 937 nm under direct pumping

A diode-pumped 937 nm Nd:GGG laser operating on the quasi-three-level under direct pumping at wavelength of around 882 nm is demonstrated, and its performances are investigated. A maximum output power of 358 mW at 937 nm was achieved at absorbed pump power of 4.8 W. The optical-to-optical conversion efficiency and the slope efficiency relative to absorbed power were 7.5 and 11.2%, respectively.     

Diode-pumped passively mode-locked Nd:YVO4 laser at 914 nm

We demonstrate, for the first time, to our knowledge, a diode-pumped passively mode-locked Nd:YVO4 laser, operating on the 4F(3/2)-4I(9/2) transition of the neodymium ion at 914 nm. We obtained 8.8 ps pulses at approximately 914 nm at a repetition rate of 94 MHz, and an averaged output power of 87 mW by using a semiconductor saturable absorber mirror.     

Diode-pumped continuous-wave Nd:LuVO4 laser operating at 916 nm

We realized an efficient diode-pumped Nd:LuVO4 continuous-wave (CW) laser operating at 916 nm. Laser experiments with 0.5 at. % Nd-doped Nd:LuVO4 crystals of various lengths and cutting directions were also investigated. The maximum output power of 930 mW was obtained with a slope efficiency of 27.2% and an optical conversion efficiency of 20.8% at the absorbed pump power of 4.5 W. The laser experiment shows that Nd:LuVO4 crystal can be used for an efficient diode-pumped laser system.     

LD-pumped Nd:YAG/LBO 556 nm yellow laser

A new laser transition at 1112 nm was obtained after analyzing the parameters of the main laser transitions in Nd:YAG and calculating the transmission loss of the cavity at 1064, 1319, and 946 nm. The maximum output power of the fundamental wavelength was 610 mW, the fundamental wavelength light-to-light conversion efficiency was 38.1%, the maximum output at 556 nm was 109 mW intra-cavity frequency doubled by LBO, the SHG conversion efficiency was 17.8%, and the overall light-to-light efficiency was 6.8% for the pump power of 1.6 W.     

Diode-pumped actively Q-switched Nd:GGG laser operating at 938 nm

The stimulated emission cross-section of Nd:GGG crystal in 938 nm transition was measured by the amplifier approach. It is 2.3×10^?20 cm². A quasi-continuous-wave diode pumped, actively Q-switched Nd:GGG laser operating at 938 nm was demonstrated. Pumped by laser diodes with 900 W peak power and 300 μs pulse duration, it generated 168 mJ energy in long pulse mode. The slope efficiency was 36%. Q-switched by a KD?P Pockels cell, 41 mJ output pulse energy was obtained. The pulse duration and peak power were 120 ns and 340 kW, respectively. The optical to optical efficiency was 7%.     

Highly efficient Nd:YAG/LBO laser at 473 nm under direct 885-nm diode laser pumping

<正>In diode pumped Nd:YAG lasers,the quantum defect is the most important parameter determining the thermal load of the laser crystal,which can be dramatically reduced by pumping directly into the upper laser level.A compact folded three-mirror cavity with a length of 105 mm is optimized to obtain a highly efficient 473-nm laser.When the absorbed pump power(with 15.8-W incident pump power) at 885 nm into Nd:YAG is 10 W,a continuous-wave 473-nm blue laser as high as 2.34 W is achieved by LBO intra-cavity frequency doubled.The optical-to-optical conversion efficiency is 14.8%.To the best of our knowledge, this is the highest efficiency at 473 nm by an intra-cavity doubled frequency Nd:YAG laser.     

高效三倍频全固态Nd∶YAG/LBO紫外激光器

报道了一种侧面泵浦Nd∶YAG、声光调Q、LBO晶体腔外倍频和三倍频的355 nm准连续波紫外激光器.采用结构简单、紧凑的平-凹腔设计,在152 W的泵浦功率下,重复频率5 kHz时,获得平均功率1.62 W的355 nm TEM00模激光输出,三倍频的转换效率为25%;重复频率1 kHz时,获得平均功率518 mW、单脉冲能量518 μJ、脉宽17 ns、峰值功率高达30 kW的紫外激光输出.