scholarly journals 202 W dual-end-pumped Tm:YLF laser with a VBG as an output coupler

2021 ◽  
Vol 9 ◽  
Author(s):  
Disheng Wei ◽  
Shuyi Mi ◽  
Ke Yang ◽  
Junhui Li ◽  
Jinwen Tang ◽  
...  
Keyword(s):  
Output Coupler ◽  
Heat Dissipation ◽  
Continuous Wave ◽  
Beam Quality ◽  
Quality Factors ◽  
Central Wavelength ◽  
Microchannel Cooling ◽  
Increasing Temperature ◽  
Tm:Ylf Laser ◽  
Total Shift

Abstract We demonstrated a 202 W Tm:YLF slab laser using a reflecting volume Bragg grating (VBG) as an output coupler at room temperature. Two kinds of active heat dissipation methods were used for the VBG to suppress the shift of wavelength caused by its increasing temperature. The maximum continuous wave (CW) output power of 202 W using the microchannel cooling was obtained under the total incident pump power of 553 W, the corresponding slope efficiency and optical-to-optical conversion efficiency were 39.7% and 36.5%, respectively. The central wavelength was 1908.5 nm with the linewidth (full width at half maximum) of 0.57 nm. Meanwhile, with the laser output increasing from 30 to 202 W, the total shift was about 1.0 nm, and the wavelength was limited to two water absorption lines near 1908 nm. The beam quality factors M2 were measured to be 2.3 and 4.0 in x and y directions at 202 W.

scholarly journals Optimized Growth and Laser Application of Yb:LuAG Single-Crystal Fibers by Micro-Pulling-Down Technique

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 78
Author(s):  
Anye Wang ◽  
Jian Zhang ◽  
Shuai Ye ◽  
Xiaofei Ma ◽  
Baiyi Wu ◽  
...  
Keyword(s):  
Single Crystal ◽  
High Power ◽  
Slope Efficiency ◽  
Continuous Wave ◽  
Beam Quality ◽  
Axial Direction ◽  
Optical Quality ◽  
Central Wavelength ◽  
High Power Lasers ◽  
Crystal Fibers

Single-crystal fibers (SCFs) have a great application potential in high-power lasers due to their excellent performance. In this work, high-quality and crack-free Yb3+:Lu3Al5O12 (Yb:LuAG) SCFs were successfully fabricated by the micro-pulling-down (μ-PD) technology. Based on the laser micrometer and the X-ray Laue diffraction results, these Yb:LuAG SCFs have a less than 5% diameter fluctuation and good crystallinity along the axial direction. More importantly, the distribution of Yb ions is proved to be uniform by electron probe microanalysis (EPMA) and the scanning electron microscope (SEM). In the laser experiment, the continuous-wave (CW) output power using a 1 mm diameter Yb:LuAG single-crystal fiber is determined to be 1.96 W, at the central wavelength of 1047 nm, corresponding to a slope efficiency of 13.55%. Meanwhile, by applying a 3 mm diameter Yb:LuAG SCF, we obtain a 4.7 W CW laser output at 1049 nm with the slope efficiency of 22.17%. The beam quality factor M2 is less than 1.1 in both conditions, indicating a good optical quality of the grown fiber. Our results show that the Yb:LuAG SCF is a potential solid-state laser gain medium for 1 μm high-power lasers.

scholarly journals Diode-pumped 10 W femtosecond Yb:CALGO laser with high beam quality

2021 ◽  
Vol 9 ◽  
Author(s):  
Jinfang Yang ◽  
Zhaohua Wang ◽  
Jiajun Song ◽  
Renchong Lv ◽  
Xianzhi Wang ◽  
...  
Keyword(s):  
Peak Power ◽  
Optical Pulse ◽  
Continuous Wave ◽  
Beam Quality ◽  
Mode Locking ◽  
Optical Efficiency ◽  
Stable Mode ◽  
Central Wavelength ◽  
Semiconductor Saturable Absorber ◽  
Diode Pumped

Abstract We demonstrate a diode-pumped femtosecond Yb:CaGdAlO4 (Yb:CALGO) laser with a semiconductor saturable absorber mirror (SESAM) for stable mode-locking operation. A perfect beam profile is measured under 10 W output power with $M_{x}^{2}$  = 1.017 and $M_{y}^{2}$  = 1.016 in the horizontal and vertical directions, respectively. At the repetition rate of 71.66 MHz, the optical pulse duration is 247 fs and the pulse energy is 140 nJ at the central wavelength of 1041 nm, corresponding to a peak power of 0.56 MW. In addition, we also generate continuous wave (CW) power of more than 15 W with TEM00 mode, corresponding to an optical-to-optical efficiency of 44.1%.

scholarly journals Laser Operation of Tm: LuAG Single-Crystal Fiber Grown by the Micro-Pulling down Method

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 898
Author(s):  
Jian Liu ◽  
Jifei Dong ◽  
Yinyin Wang ◽  
Hangqi Yuan ◽  
Qingsong Song ◽  
...  
Keyword(s):  
Single Crystals ◽  
Ray Tracing ◽  
Intensity Distribution ◽  
Continuous Wave ◽  
Beam Quality ◽  
Pump Intensity ◽  
Laser Operation ◽  
Quality Factors ◽  
Continuous Wave Output Power ◽  
Crystal Fiber

Single crystals fiber (SCF) of LuAG doped with 2.0 at.% thulium has been grown by using micro-pulling down (µ-PD) technique. A continuous-wave output power of 2.44 W was achieved with a slope efficiency of 11.7% using a 783-nm diode laser as pump source. The beam quality factors M2 were 1.14 and 1.67 in the x and y directions, respectively. This is, to the best of our knowledge, the first report on the Tm:LuAG SCF laser. Using ray tracing analysis, the influence of laser performance by the pump intensity distribution in the SCF was also studied.

scholarly journals 1.5-W 520 nm Continuous-wave Output from a 50μm/0.22NA Fiber-Coupled Laser Diode Module

2021 ◽  
Author(s):  
Bojie Lou ◽  
Bing Ding ◽  
Zhangwang Miao ◽  
Pengfei Zhao ◽  
Haijuan Yu ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Continuous Wave ◽  
Numerical Aperture ◽  
Experimental Result ◽  
Optical Conversion Efficiency ◽  
Core Diameter ◽  
Central Wavelength ◽  
High Brightness ◽  
Optical Conversion ◽  
Final Output

Abstract In this paper, a high brightness fiber-coupled module with a central wavelength of 520nm is simulated and designed by ray-tracing software ZEMAX, and then is experimentally implemented. Three 1-w continuous-wave green LD single emitters based on TO-9-package are successively collimated, spatially combined, and focused into an optical fiber with a core diameter of 50 μm and a numerical aperture of 0.22. The final output power of 1.53w is obtained, corresponding to an optical-optical conversion efficiency of 51% and an electro-optical conversion efficiency of 10%, and the tolerance between the simulation and the experimental result is analyzed and explained.

Four-wave mixing effect on high-power continuous-wave all-fiber lasers

2018 ◽  
Vol 32 (23) ◽  
pp. 1850275
Author(s):  
Jinkun Zheng ◽  
Wei Zhao ◽  
Baoyin Zhao ◽  
Zhe Li ◽  
Gang Li ◽  
...  
Keyword(s):  
High Power ◽  
Fiber Lasers ◽  
Continuous Wave ◽  
Beam Quality ◽  
Matching Condition ◽  
Four Wave Mixing ◽  
Theoretical Description ◽  
Phase Matching ◽  
Wave Mixing ◽  
Mixing Effect

A four-wave mixing effect on high-power continuous-wave fiber lasers has been demonstrated theoretically and experimentally. Detailed theoretical description of phase matching is presented and we found that the phase matching condition is satisfied at the frequency shift of 5.16 THz. While the intensity in fiber core region is more than about 394 MW/cm2, the four-wave mixing products of 1100 nm and 1060 nm were also observed in high-power all-fiber laser. The comparison shows that the experiment result is in good agreement with the simulation result. In addition, the beam quality deterioration for the laser is caused by the four-wave mixing effect and the mode instability. The [Formula: see text] factor measured at maximal intensity of 478 MW/cm2 is 2.80.

High power and beam quality continuous-wave Nd:GdVO_4 laser in-band diode-pumped at 912  nm

2017 ◽  
Vol 5 (4) ◽  
pp. 346 ◽  
Author(s):  
Mohammad Nadimi ◽  
Tanant Waritanant ◽  
Arkady Major
Keyword(s):  
High Power ◽  
Continuous Wave ◽  
Beam Quality ◽  
Diode Pumped

Compact KTA-Based Optical Parametric Oscillator Driven by a Passively Q-Switched YVO4/Nd:YVO4 Laser

2017 ◽  
Vol 886 ◽  
pp. 81-85
Author(s):  
Fen Bai ◽  
Zhi Yong Jiao ◽  
Xian Feng Xu ◽  
Hui Zhang
Keyword(s):  
Optical Parametric Oscillator ◽  
Repetition Rate ◽  
Output Signal ◽  
Pulse Repetition Rate ◽  
Beam Quality ◽  
Parametric Oscillator ◽  
Pulse Repetition ◽  
Signal Power ◽  
Quality Factors ◽  
Optical Parametric

A compact passively Q-switched YVO4/Nd:YVO4/KTA intracavity optical parametric oscillator (OPO) is realized. With an end-pumping diode power of 16.6 W, output signal power of 932 mW and idler power of 415 mW are obtained at a pulse repetition rate of 101 kHz. The pulse widths and the beam quality factors are also analyzed for both signal and idler lasers.

scholarly journals High pulse energy fiber/solid-slab hybrid picosecond pulse system for material processing on polycrystalline diamonds

2018 ◽  
Vol 6 ◽  
Author(s):  
Wei Chen ◽  
Bowen Liu ◽  
Youjian Song ◽  
Lu Chai ◽  
Qianjin Cui ◽  
...  
Keyword(s):  
Material Processing ◽  
Pulse Energy ◽  
Beam Quality ◽  
Picosecond Pulse ◽  
High Pulse Energy ◽  
Central Wavelength ◽  
Picosecond Pulses ◽  
High Pulse ◽  
Fiber Mode ◽  
Mode Locked Laser

We demonstrate an all polarization-maintaining (PM) fiber mode-locked laser seeded, hybrid fiber/solid-slab picosecond pulse laser system which outputs $40~\unicode[STIX]{x03BC}\text{J}$, 10 ps pulses at the central wavelength of 1064  nm. The beam quality factors $M^{2}$ in the unstable and stable directions are 1.35 and 1.31, respectively. $15~\unicode[STIX]{x03BC}\text{J}$ picosecond pulses at the central wavelength of 355 nm are generated through third harmonic generation (THG) by using two $\text{LiB}_{3}\text{O}_{5}$ (LBO) crystals, in order to get better processing efficiency on polycrystalline diamonds. The high pulse energy and beam quality of these ultraviolet (UV) picosecond pulses are confirmed by latter experiments of material processing on polycrystalline diamonds. This scheme which combines the advantages of the all PM fiber mode-locked laser and the solid-slab amplifier enables compact, robust and chirped pulse amplification-free amplification with high power picosecond pulses.

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