Spectral interference fringes in chirped large-mode-area fiber Bragg gratings

Poozesh, Reza; Madanipour, Khosro; Vatani, Vahid

doi:10.1016/j.yofte.2016.07.004

Cited by 9 publications

(2 citation statements)

References 6 publications

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“…Since the bending loss of mode is much higher than that of mode, the laser output power reduces and optical efficiency declines. The reason for the sharp increase of backward light power beyond TMI threshold backs to the higher transmission of HR FBG for mode 23 , 24 . Coincidence of these two effects indicates the appearance of TMI 25 .…”

Section: Resultsmentioning

confidence: 99%

The effect of population inversion saturation on the transverse mode instability threshold in high power fiber laser oscillators

Roohforouz

Chenar

Rezaei-Nasirabad

et al. 2021

Sci Rep

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To achieve a 3.02 kW Yb-doped fiber laser oscillator, the behavior of transverse mode instability (TMI) is experimentally studied in different pumping configurations; co, hybrid, counter, and bidirectional. A comparative analysis showed that population inversion saturation has a substantial impact on TMI threshold enhancement in high power fiber oscillators. Monitoring the dynamic power exchange of fundamental mode and higher-order mode of laser output beam indicates that in a hybrid pumping scheme, simultaneous pumping with two different wavelengths enhances the TMI threshold to a great stand. Moreover, injecting a few watts of pumping light in the counter direction mitigates the TMI caused by pumping in the co-direction. Calculation of population inversion in different pumping configurations using simulation shows that higher population inversion saturation leads to increasing the TMI threshold.

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Section: Resultsmentioning

confidence: 99%

The effect of population inversion saturation on the transverse mode instability threshold in high power fiber laser oscillators

Roohforouz

Chenar

Rezaei-Nasirabad

et al. 2021

Sci Rep

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“…Because of the similarity between fiber oscillators and double-pass amplifiers, this coupling mechanism can contribute to an increase in HOM content in oscillators. Since the HR FBGs have rather low reflectivities for HOMs [26,27], it can be seen in figure 3(b) that the backward light power passing through the HR FBG rapidly increases beyond the 1500 W pumping power. This mode coupling mechanism is different from the mode coupling in single-pass amplifiers, which can be the origin of dynamic TMI [11].…”

Section: Fiber Oscillatormentioning

confidence: 99%

Transverse mode instability of fiber oscillators in comparison with fiber amplifiers

et al. 2018

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Transverse mode instability (TMI) is experimentally investigated in a fiber oscillator and a fiber amplifier. For a reasonable comparison of TMI in these two configurations, the same optical components and design parameters are applied to both. Our experimental results show that the TMI power threshold in a fiber oscillator is lower than in a corresponding fiber amplifier. By using simulation software, a fiber oscillator and an amplifier are designed with similar characteristics, to provide identical conditions for all effective parameters on TMI in both of them. Since the signal propagation in fiber oscillators is different from that of single-pass fiber amplifiers, and also since both forward and backward propagating signals in fiber oscillators can generate thermo-optic index gratings, the observed lower TMI threshold in the fiber oscillator is due to its different interaction of light with index gratings.

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2.5 kW TMI-free co-pump Yb-doped fiber oscillator by 971.5 nm pumping wavelength

Rezaei-Nasirabad

Azizi²,

Paygan³

et al. 2023

Optics & Laser Technology

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Spectral interference fringes in chirped large-mode-area fiber Bragg gratings

Cited by 9 publications

References 6 publications

The effect of population inversion saturation on the transverse mode instability threshold in high power fiber laser oscillators

The effect of population inversion saturation on the transverse mode instability threshold in high power fiber laser oscillators

Transverse mode instability of fiber oscillators in comparison with fiber amplifiers

2.5 kW TMI-free co-pump Yb-doped fiber oscillator by 971.5 nm pumping wavelength

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