Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback

Ye, Yun; Xi, Xiaoming; Shi, Chen; Zhang, Hanwei; Yang, Baolai; Wang, Xiaolin; Zhang, Pu; Xu, Xiaojun

doi:10.1109/jphot.2019.2923709

Cited by 20 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The total length of the passive fiber after the combiner was about 3.5 m with a core/cladding diameter of 25/250 µm. A ∼9°angle was cleaved at the backward output port to reduce the feedback coefficient [18].…”

Section: Table II Experimental Resultsmentioning

confidence: 99%

Theoretical and Experimental Study of High-Peak-Power High-Brightness Quasi-CW Fiber Laser

et al. 2022

View full text Add to dashboard Cite

The main factors limiting the power scaling of highpeak-power high-brightness quasi-continuous wave (QCW) fiber laser oscillator and a possible solution are analyzed in this paper. The impacts of fiber length and grating parameters on the output power are studied by rate equations. Under the optimized parameters, a high-brightness QCW fiber laser oscillator with a peak power of 7.3 kW is presented experimentally by using a 24 meter long spindle-shaped Yb-doped fiber with a constant core cladding ratio, and that is the best performance of peak power and brightness in near-single-mode QCW fiber lasers at present to the best of our knowledge. The corresponding pulse energy is 0.57 J and the beam quality M 2 factor is about 1.43 under the condition of repetition frequency of 1 kHz and pulse width of 100 µs. The details are analyzed, and also the limiting factors of further power scaling, strategies of suppressing nonlinear effects and the principle of optical device parameter optimization.

show abstract

Section: Table II Experimental Resultsmentioning

confidence: 99%

Theoretical and Experimental Study of High-Peak-Power High-Brightness Quasi-CW Fiber Laser

et al. 2022

View full text Add to dashboard Cite

show abstract

“…For a high power laser oscillator, 25/400 µm YDF is a promising gain fiber to obtain high power and high quality beam output [10,11]. Without loss of generality, the calculation in this paper is based on this kind of fiber, of which the core diameter and the NA is 25 µm and 0.062, respectively.…”

Section: Calculation Results and Discussionmentioning

confidence: 99%

The influence of axial offset of fusion splicing on a large mode area fiber based oscillator

Zhang¹,

Yang²,

Wang³

et al. 2021

Laser Phys. Lett.

Self Cite

View full text Add to dashboard Cite

Fiber oscillators have the potential for achieving high power, high beam quality lasers with simple and compact structure, of which the fusion splicing point is an important aspect to the laser output characteristics. A model taking into account the axial offset of the splicing point and spatial mode competition has been proposed to analyze the mode interaction of a large mode area fiber based oscillator. The calculated results show that the axial offset of the output side fusion point has the main influence on the laser output beam quality, but the axial offset would not obviously reduce the optical efficiency, especially when the value is smaller than 2 μm. The influence of cavity parameters on the laser output characteristics under the existence of splicing point with axial offset has also been discussed. This model can provide a method for analyzing the mode dynamic that may be helpful for understanding the mode interactions in fiber oscillators.

show abstract

“…Another two homemade CLSs were employed to strip the residual pump laser and cladding mode signal laser. It should be mentioned that, after the CLS 2, the amplified fiber laser has passed through an extra monolithic fiber-optic delivery system for the purpose of power delivering as well as triggering the SRS effect, which was terminated with a home-made anti-reflection coated collimated quartz block head (QBH) for suppressing the deleterious backward reflection [11]. To investigate the laser performance, the output power, optical spectrum, temporal characteristics and beam quality have been recorded.…”

Section: Methodsmentioning

confidence: 99%

SRS-Induced Spatial-Spectral Distortion and Its Mitigation Strategy in High-Power Fiber Amplifiers

Zhang

Xie

et al. 2022

IEEE Photonics J.

View full text Add to dashboard Cite

The spatial-spectral evolution properties of laser beam in the presence of stimulated Raman scattering (SRS) effect have been studied in large mode area (LMA) fiber. With the employment of long/short pass filters, spatial evolution of the signal and Raman light has been studied individually. After the onset of SRS, the simultaneous optimizing of signal light and degrading of Raman light was observed, which has been attributed to the SRS effect of multimode laser beams in LMA fiber. The spectral evolution characteristics indicated that the SRS effect in LMA fiber will trigger other nonlinear effects, mainly inter-modal four-wave-mixing effect and cross-phase-modulation induced modulation instability. Furthermore, the impacts of bending strategy and multimode LMA fiber on SRS-induced spatialspectral distortion have also been studied, which shows that the SRS-induced mode distortion can be suppressed by increasing the fiber size while the bending strategy plays a limited role.

show abstract

Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback

Cited by 20 publications

References 21 publications

Theoretical and Experimental Study of High-Peak-Power High-Brightness Quasi-CW Fiber Laser

Theoretical and Experimental Study of High-Peak-Power High-Brightness Quasi-CW Fiber Laser

The influence of axial offset of fusion splicing on a large mode area fiber based oscillator

SRS-Induced Spatial-Spectral Distortion and Its Mitigation Strategy in High-Power Fiber Amplifiers

Contact Info

Product

Resources

About