scholarly journals Investigation on extreme frequency shift in silica fiber-based high-power Raman fiber laser

2018 ◽  
Vol 6 ◽  
Author(s):  
Jiaxin Song ◽  
Hanshuo Wu ◽  
Jun Ye ◽  
Hanwei Zhang ◽  
Jiangming Xu ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Fiber Laser ◽  
High Power ◽  
High Efficiency ◽  
Maximum Output Power ◽  
Gain Medium ◽  
Maximum Output ◽  
Optical Efficiency ◽  
Central Wavelength ◽  
Raman Fiber Laser

In this paper, we experimentally investigated the extreme frequency shift in high-power Raman fiber laser (RFL). The RFL was developed by using a pair of fiber Bragg gratings with fixed and matched central wavelength (1120 nm) combined with a piece of 31-m-long polarization maintaining (PM) passive fiber adopted as Raman gain medium. The pump source was a homemade high-power, linearly polarized (LP) wavelength-tunable master oscillator power amplifier (MOPA) source with ${\sim}25~\text{nm}$ tunable working range (1055–1080 nm). High-power and high-efficiency RFL with extreme frequency shift between the pump and Stokes light was explored. It is found that frequency shift located within 10.6 THz and 15.2 THz can ensure efficient Raman lasing, where the conversion efficiency is more than 95% of the maximal value, 71.3%. In addition, a maximum output power of 147.1 W was obtained with an optical efficiency of 71.3%, which is the highest power ever reported in LP RFLs to the best of our knowledge.

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.

High power, high efficiency diode pumped Raman fiber laser

2016 ◽  
Vol 13 (6) ◽  
pp. 065101 ◽  
Author(s):  
Yaakov Glick ◽  
Viktor Fromzel ◽  
Jun Zhang ◽  
Asaf Dahan ◽  
Nikolay Ter-Gabrielyan ◽  
...  
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
High Efficiency ◽  
Raman Fiber Laser ◽  
Diode Pumped

scholarly journals 1.3 µm dissipative soliton resonance generation in Bismuth doped fiber laser

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
H. Ahmad ◽  
S. N. Aidit ◽  
S. I. Ooi ◽  
M. Z. Samion ◽  
S. Wang ◽  
...  
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Pulse Energy ◽  
Signal To Noise Ratio ◽  
Maximum Output Power ◽  
High Energy ◽  
Gain Medium ◽  
Dissipative Soliton ◽  
Maximum Output ◽  
Soliton Resonance

AbstractIn this work, a Figure-9 (F9) bismuth-doped fiber laser (BiDFL) operating in the dissipative soliton resonance (DSR) regime is presented. The 1338 nm laser used a BiDF as the active gain medium, while a nonlinear amplifying loop mirror (NALM) in an F9 configuration was employed to obtain high energy mode-locked pulses. The wave breaking-free rectangular pulse widened significantly in the time domain with the increase of the pump power while maintaining an almost constant peak power of 0.6 W. At the maximum pump power, the mode-locked laser delivered a rectangular-shaped pulse with a duration of 48 ns, repetition rate of 362 kHz and a radio-frequency signal-to-noise ratio of more than 60 dB. The maximum output power was recorded at around 11 mW with a corresponding pulse energy of 30 nJ. This is, to the best of the author’s knowledge, the highest mode-locked pulse energy obtained at 1.3 μm as well as the demonstration of an NALM BiDFL in a F9 configuration.

Molybdenum disulfide saturable absorber for eye-safe mode-locked fiber laser generation

2018 ◽  
Vol 27 (01) ◽  
pp. 1850010 ◽  
Author(s):  
A. A. Latiff ◽  
X. S. Cheng ◽  
M. F. M. Rusdi ◽  
M. C. Paul ◽  
S. W. Harun ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Molybdenum Disulfide ◽  
Saturable Absorber ◽  
Signal To Noise Ratio ◽  
Maximum Output Power ◽  
Gain Medium ◽  
Laser Generation ◽  
Maximum Output ◽  
Saturation Intensity ◽  
Co Doped

We demonstrated an all-fiber mode-locked Thulium–Holmium co-doped fiber laser (THDFL) based on molybdenum disulfide (MoS2) tape saturable absorber. The THDFL generates a mode-locked pulse in anomalous regime at 1,979[Formula: see text]nm using 5[Formula: see text]m long Thulium–Holmium co-doped (THDF) as a gain medium. Through mechanical exfoliation method, the MoS2 was mechanically extracted from a commercial MoS2 crystal by using a clear scotch tape. Through balanced twin-detector measurement, the obtained MoS2 tape has a nonlinear absorption of 10% with 100[Formula: see text]MW/cm2 saturation intensity. Under 775[Formula: see text]mW to 852[Formula: see text]mW pump power, a stable pulse train was obtained at 9.12[Formula: see text]MHz repetition rate with a signal-to-noise ratio (SNR) of 45[Formula: see text]dB. The maximum output power and pulse energy were measured about 20[Formula: see text]mW and 2.2[Formula: see text]nJ, respectively. With a 3-dB spectral bandwidth of 2.1[Formula: see text]nm, the minimum possible pulse width was determined as 1.97[Formula: see text]ps.

High power and high efficiency Tm-doped fiber laser pumped by a 1173 nm Raman fiber laser

CLEO: 2014 ◽  
2014 ◽  
Author(s):  
Xiong Wang ◽  
Hanwei Zhang ◽  
Pu Zhou ◽  
Xiaolin Wang ◽  
Hu Xiao ◽  
...  
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
High Efficiency ◽  
Raman Fiber Laser

scholarly journals Full-Band Oversized Turnstile-Based Waveguide Four-Way Power Divider/Combiner for High-Power Applications

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 193
Author(s):  
Juan Cano ◽  
Franco Di Paolo ◽  
Angel Mediavilla ◽  
Paolo Colantonio
Keyword(s):  
High Power ◽  
Rectangular Waveguide ◽  
High Efficiency ◽  
Maximum Output Power ◽  
Variable Number ◽  
Power Divider ◽  
Electrical Performance ◽  
Maximum Output ◽  
Relative Bandwidth ◽  
Full Band

Very high-power and high-efficiency microwave applications require waveguide structures to combine/divide the power from/to a variable number of high-power solid-state devices. In the literature, among the different waveguide configurations, those capable of providing the maximum output power show a limited relative bandwidth. To overcome this limitation, in this paper a full-band (40%) waveguide power divider/combiner specifically designed for high-power applications (up to several kW) is presented. The proposed structure uses an evolved turnstile junction with a standard rectangular waveguide common port, rotated 45°, with respect to its central axis, to divide/combine the signal to/from the four output/input rectangular ports. The inclusion of an oversized central cavity together with circular and rectangular waveguide impedance transformers at the common port allows the achievement of a full-band operation with excellent electrical performance, while maintaining a very simple and compact configuration. Only two layers of metal are required for the physical implementation of this structure in platelet configuration. A prototype has been designed covering the full Ka-band (26.5–40 GHz), showing an excellent measured performance with around 30 dB of return loss, 0.18 dB of insertion loss, and less than 1.5° of phase imbalance.

scholarly journals High Power SESAM Mode-Locked Laser Based on Yb3+:YAlO3 Bulk Crystal

2020 ◽  
Vol 11 (3) ◽  
pp. 179-186
Author(s):  
A. Rudenkov ◽  
V. Kisel ◽  
A. Yasukevich ◽  
K. Hovhannesyan ◽  
A. Petrosyan ◽  
...  
Keyword(s):  
Rare Earth ◽  
Active Medium ◽  
High Power ◽  
Continuous Wave ◽  
Maximum Output Power ◽  
Rare Earth Ions ◽  
Maximum Output ◽  
Optical Efficiency ◽  
Power Mode ◽  
Mode Locked Laser

Yttrium aluminium perovskite YAlO3 (YAP) crystal, doped with rare-earth ions, has been extensively studied as a diode-pumped laser host material. The wide interest to rare-earth ions doped YAP crystals is explained by its good thermal and mechanical properties, high natural birefringence, widely used Czochralski  growth method. The aim of this work was to study the Yb3+:YAlO3  crystal as an active medium for high  power mode-locked laser.Yb3+-doped perovskite-like aluminate crystals have unique spectroscopic and thermooptical properties that allowed using these crystals as an active medium of high power continuous wave (CW) and modelocked (ML) bulk lasers with diode pumping.growth method. The aim of this work was to study the Yb3+:YAlO3  crystal as an active medium for high  power mode-locked laser.In our work spectroscopic properties of Yb:YAP crystal and laser characteristics in CW and ML regimes are investigated. Maximum output power of 4 W with optical-to-optical efficiency of 16.3 % and 140 fs pulse duration have been obtained for Yb:YAP E //c-polarization with 10 % output coupler transmittance. Tunability range as wide as 67 nm confirms high promise of using Yb:YAP crystal for lasers working in wide spectral range. 

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.

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