scholarly journals Over 19 W Single-Mode 1545 nm Er,Yb Codoped All-Fiber Laser

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Jiadong Wu ◽  
Chunxiang Zhang ◽  
Jun Liu ◽  
Ting Zhao ◽  
Weichao Yao ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
Stimulated Raman Scattering ◽  
Maximum Output Power ◽  
Laser Cavity ◽  
Single Mode ◽  
Transverse Mode ◽  
Spectral Width ◽  
Maximum Output ◽  
Silica Fibers

We report a high-power cladding-pumped Er,Yb codoped all-fiber laser with truly single transverse mode output. The fiber laser is designed to operate at 1545 nm by the use of a pair of fiber Bragg gratings (FBGs) to lock and narrow the output spectrum, which can be very useful in generating the eye-safe ~1650 nm laser emission through the Stimulated Raman Scattering (SRS) in silica fibers that is of interest in many applications. Two pieces of standard single-mode fibers are inserted into the laser cavity and output port to guarantee the truly single-mode output as well as good compatibility with other standard fiber components. We have obtained a maximum output power of 19.2 W at 1544.68 nm with a FWHM spectral width of 0.08 nm, corresponding to an average overall slope efficiency of 31.9% with respect to the launched pump power. This is, to the best of our knowledge, the highest output power reported from simple all-fiber single-mode Er,Yb codoped laser oscillator architecture.

scholarly journals Novel constant-cladding tapered-core ytterbium-doped fiber for high-power fiber laser oscillator

2021 ◽  
Vol 9 ◽  
Author(s):  
Yun Ye ◽  
Xianfeng Lin ◽  
Xiaoming Xi ◽  
Chen Shi ◽  
Baolai Yang ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
High Power ◽  
Stimulated Raman Scattering ◽  
Beam Quality ◽  
Maximum Output Power ◽  
Maximum Output ◽  
Power Scaling ◽  
Laser Oscillator ◽  
Optical Efficiency

Abstract Power scaling based on traditional ytterbium-doped fibers (YDFs) is limited by optical nonlinear effects and transverse mode instability (TMI) in high-power fiber lasers. Here, we propose a novel long tapered fiber with a constant cladding and tapered core (CCTC) along its axis direction. The tapered-core region of the fiber is designed to enhance the stimulated Raman scattering (SRS) threshold and suppress higher-order mode resonance in the laser cavity. The CCTC YDF was fabricated successfully with a modified chemical vapor deposition (MCVD) method combined with solution doping technology, which has a cladding diameter of 400 μm and a varying core with a diameter of ~24 μm at both ends and ~31 μm in the middle. To test the performance of the CCTC fiber during high-power operation, an all-fiber laser oscillator based on a CCTC YDF was investigated experimentally. As a result, a maximum output power of 3.42 kW was achieved with an optical-to-optical efficiency of 55.2%, although the TMI effect was observed at an output power of ~3.12 kW. The measured beam quality (M2 factor) was ~1.7, and no sign of the Raman component was observed in the spectrum. We believe that CCTC YDF has great potential to simultaneously mitigate the SRS and TMI effects, and further power scaling is promising by optimizing the structure of the YDF.

scholarly journals Two-micron all-fiberized passively mode-locked fiber lasers with high-energy nanosecond pulse

2020 ◽  
Vol 8 ◽  
Author(s):  
Meng Wang ◽  
Yijian Huang ◽  
Zongpeng Song ◽  
Jincheng Wei ◽  
Jihong Pei ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Pulse Duration ◽  
Output Power ◽  
Saturable Absorber ◽  
Pulse Energy ◽  
Fiber Lasers ◽  
Maximum Output Power ◽  
High Energy ◽  
Maximum Output ◽  
Stable Mode

We report on mode-locked thulium-doped fiber lasers with high-energy nanosecond pulses, relying on the transmission in a semiconductor saturable absorber (SESA) and a carbon nanotube (CNTs-PVA) film separately. A section of an SMF–MMF–SMF structure multimode interferometer with a transmission peak wavelength of ∼2003 nm was used as a wavelength selector to fix the laser wavelength. When the SESA acted as a saturable absorber (SA), the mode-locked fiber laser had a maximum output power of ∼461 mW with a pulse energy of ∼0.14 μJ and a pulse duration of ∼9.14 ns. In a CNT-film-based mode-locked fiber laser, stable mode-locked pulses with the maximum output power of ∼46 mW, pulse energy of ∼26.8 nJ and pulse duration of ∼9.3 ns were obtained. To the best of our knowledge, our experiments demonstrated the first 2 μm region ‘real’ SA-based dissipative soliton resonance with the highest mode-locked pulse energy from a ‘real’ SA-based all-fiberized resonator.

scholarly journals kW-class high power fiber laser enabled by active long tapered fiber

2018 ◽  
Vol 6 ◽  
Author(s):  
Chen Shi ◽  
Hanwei Zhang ◽  
Xiaolin Wang ◽  
Pu Zhou ◽  
Xiaojun Xu
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
Continuous Wave ◽  
Beam Quality ◽  
Laser System ◽  
Maximum Output Power ◽  
Nonlinear Effects ◽  
Fiber Amplifier ◽  
Maximum Output ◽  
Tapered Fiber

Compared with traditional uniform fibers, tapered fiber has numerous unique advantages, such as larger mode area, higher pump absorption, suppression to nonlinear effects, and maintaining good beam quality. In this manuscript, we have constructed an all-fiberized fiber amplifier which is based on a piece of ytterbium-doped tapered double-clad fiber (T-DCF). The fiber amplifier is operated under continuous wave (CW) regime at 1080 nm wavelength. The $M^{2}$ factor of the amplifier at 1.39 kW output power is ${\sim}1.8$. The maximum output power of the system reached 1.47 kW, which, to the best of our knowledge, is the highest output power of long tapered fiber based fiber laser system. Our result successfully verifies the potential of power scalability and all-fiberized capability of long tapered fiber, and the performance of our system can be further enhanced by fiber design optimization.

scholarly journals Tunable Stokes Laser Based on KTiOPO4 Crystal

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 974
Author(s):  
Zecheng Wang ◽  
Xingyu Zhang ◽  
Zhenhua Cong ◽  
Zhaojun Liu ◽  
Xiaohan Chen ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Output Power ◽  
Stimulated Raman Scattering ◽  
Pulse Repetition Frequency ◽  
Maximum Output Power ◽  
Rate Equations ◽  
Stokes Wave ◽  
Maximum Output ◽  
Output Wavelength ◽  
Stimulated Raman

The characteristics of a tunable Stokes laser based on the cascaded stimulated polariton scattering and stimulated Raman scattering in KTiOPO4 crystal were studied experimentally and theoretically. When the pumping wavelength was 1064 nm, the Stokes laser output wavelength was able to be tuned discontinuously from 1112.08 nm to 1113.64 nm, from 1114.94 nm to 1115.77 nm, and from 1117.37 nm to 1119.92 nm, and the maximum output power appeared at 1118.86 nm. With a pulse repetition frequency of 7 kHz and a pump power of 6.0 W, the maximum output power of the Stokes laser reached 734 mW, and the corresponding diode to laser conversion efficiency was 12.2%. The rate equations describing the temporal evolutions of the fundamental and Stokes waves by noncollinear stimulated polariton scattering and the Stokes wave by collinear stimulated Raman scattering were derived. They were used to simulate the tunable Stokes laser. The calculated results were in agreement with the experimental results on the whole.

Optimization of the parameters of a superpulse thulium fiber laser with wavelength 1.94 μm for minipercutaneous lithotripsy

2020 ◽  
Vol 8 (1) ◽  
pp. 45-51
Author(s):  
R.E. Klimov ◽  
◽  
V.Yu. Lekarev ◽  
D.G. Tsarichenko ◽  
А.М. Dymov ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
Pulse Energy ◽  
Yttrium Aluminum Garnet ◽  
Maximum Output Power ◽  
Maximum Output ◽  
Stone Free Rate ◽  
Thulium Fiber Laser ◽  
The Impact ◽  
Free Rate

At present, minipercutaneous nephrolithotripsy is a highly effective and safe method for fragmentation of stones with sizes up to 3 cm. The use for lithotripsy of a holmium: yttrium aluminum garnet laser with wavelength 2.1 μm (Ho:YAG) is a common practice today. Of late, however, more attention is paid to a new superpulse thulium fiber laser with wavelength 1.94 μm and maximum output power 40 W. The use of a thulium laser with pulse energy 0.025–6 J and a high repetition rate (to 1600 Hz) permits to obtain (compared with a holmium laser) better results of stone dusting. Objective. Selection of the optimal modes of stone fragmentation in minipercutaneous nephrolithotripsy with the use of a superpulse thulium fiber laser with wavelength 1.94 μm and maximum output power 40 W in patients with nephrolithiasis. Patients and methods. The study included patients (n = 171), who underwent minipercutaneous nephrolithotripsy using a superpulse thulium fiber laser during the period from February 2018 to July 2019. The following parameters of laser radiation were used: pulse energy 0.1-6 J, power 6-40 W, pulse rate 30-300 Hz. The impact of modes on endoscopic visualization and retropulsion was assessed intraoperatively. Results. Statistical analysis of the specificities of the most often used modes was conducted: No 1 – «0.15 J, 200 Hz, 30 W», No 2 – «0.5 J, 30 Hz, 15 W», No 3 – «0.8 J, 31.25 Hz, 25 W», No 4 – «0.8 J, 37.5 Hz, 30 W», No 5 – «1.5 J, 15 Hz, 30 W», No 6 – «1.5 J, 26.6 Hz, 40 W», No 7 – «2 J, 15 Hz, 30 W», No 8 – «2 J, 20 Hz, 40 W», No 9 – «4 J, 10 Hz, 40 W»; their effects on retropulsion and on endoscopic visualization were studies. The stone free rate was assessed on the first post-operative day according to the findings of low-dose CT. Conclusion. Study of the modes of thulium fiber lithotripsy, assessment of retropulsion and endoscopic visualization depending on the choice of emitted radiation parameters of a thulium fiber laser make it possible to improve the outcomes of operative treatment in patients with nephrolithiasis. Key words: minipercutaneous, nephrolithotripsy, nephrolithiasis, MPNL, thulium fiber lithotripsy, retropulsion, visibility, superpulse thulium fiber laser, wavelength 1.94 μm, stone free rate

scholarly journals Tunable Single-Longitudinal-Mode High-Power Fiber Laser

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Jonas K. Valiunas ◽  
Gautam Das
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Maximum Output Power ◽  
Longitudinal Mode ◽  
Laser Cavity ◽  
Single Longitudinal Mode ◽  
Maximum Output ◽  
Erbium Doped ◽  
Fabry Perot ◽  
Polarization Maintaining

We report a novel CW tunable high-power single-longitudinal-mode fiber laser with a linewidth of∼9 MHz. A tunable fiber Bragg grating provided wavelength selection over a 10 nm range. An all-fiber Fabry-Perot filter was used to increase the longitudinal mode spacing of the laser cavity. An unpumped polarization-maintaining erbium-doped fiber was used inside the cavity to eliminate mode hopping and increase stability. A maximum output power of 300 mW was produced while maintaining single-longitudinal-mode operation.

scholarly journals Investigation of output power in ring CW fiber laser using graphene saturable absorber

2019 ◽  
Vol 8 (3) ◽  
pp. 1022-1027
Author(s):  
Belal Ahmed Hamida ◽  
Tawfig Eltaif ◽  
Farhan Daniel Bin Mohd Noh ◽  
Sheroz Khan
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
Saturable Absorber ◽  
Continuous Wave ◽  
Ring Cavity ◽  
Maximum Output Power ◽  
Specific Area ◽  
Maximum Output ◽  
Coupling Ratio ◽  
Graphene Saturable Absorber

This paper reported the effect of different coupling ratio in continuous wave fiber laser in a ring cavity configuration. Different coupling ratios of 10/90 and 50/50 were tested. Where the output power may vary depending on the ratio and it can be applied to specific area that requires either high or low output power. In addition, generation of passive Q-switched erbium doped fiber laser (EDFL) using graphene based saturable absorber in ring cavity using different coupling ratio was experimentally investigated. As a result, wavelength centered at 1566.62nm is obtain from EDFL cavity. Moreover, the cavity using coupler of 50/50 is capable to achieve Q-switched pulses as compared to the cavity using coupler of 10/90. Where the maximum output power recorded is 336mW with pulse repetition rate of 23.74 kHz. In addition, the pulse width is 3.84µs, and pulse energy is 14.15nJ.

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