Raman Suppression in a Kilowatt Narrow-Band Fiber Amplifier

Hu, Man; Yang, Yifeng; Zheng, Yi; Liu, Guang-Bo; Wang, Jianhua; Li, Kai; Chen, Xiaolong; Zhao, Chun; He, Bing; Zhou, Jun

doi:10.1088/0256-307x/33/4/044208

Cited by 4 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To operate under continuous wave multi-kilowatt power or pulsed high peak power conditions, the optical fibers used in these lasers require a large mode field diameter (MFD) to reduce the impact of nonlinear effects such as stimulated Raman scattering [2,3] and self-phase modulation on the laser performance. However, it is extremely challenging to increase the MFD while maintaining the outstanding beam quality characteristics of the fiber laser.…”

Section: Introductionmentioning

confidence: 99%

Fiber core mode leakage induced by refractive index variation in high-power fiber laser

Yan¹,

Wang²,

Huang³

et al. 2017

Chinese Phys. B

View full text Add to dashboard Cite

This paper presents an investigation of specific optical fiber core mode leakage behavior that occurs in high-power double-clad fiber lasers as a result of thermally-induced refractive index variations. A model of the power transfer between the core modes and the cladding modes during thermally-induced refractive index variations is established based on the mode coupling theory. The results of numerical simulations based on actual laser parameters are presented. Experimental measurements were also carried out, the results showed good agreement with the corresponding simulation results.

show abstract

Section: Introductionmentioning

confidence: 99%

Fiber core mode leakage induced by refractive index variation in high-power fiber laser

Yan¹,

Wang²,

Huang³

et al. 2017

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

“…[11] However, in atomic gases, nonlinear effects can be enhanced by choosing different energy levels and transition pathways. Based on these features, strong nonlinear effects can be achieved by using electromagnetic induction transparency (EIT) [12][13][14][15][16][17] or weakly driven active Raman gain (ARG) [18][19][20][21][22][23][24][25][26][27][28] technologies. In particular, Artoni et al proposed a novel phaseby-phase control mechanism to achieve broadly tunable light phase shifts.…”

mentioning

confidence: 99%

A low noise, high fidelity cross phase modulation in multi-level atomic medium*

Wang¹,

Jia²,

Zhu³

et al. 2021

Chinese Phys. B

View full text Add to dashboard Cite

We develop a hybrid scheme of cross phase modulation based on electromagnetically induced transparency (EIT) and active Raman gain (ARG) in a multi-level atomic medium. The cross phase modulation, with low loss and without noise, is demonstrated in a room-temperature 85Rb vapor. We show that a π radian nonlinear Kerr phase shift of the signal light relative to a reference light is observed when the signal light is modulated by the phase control field with the low light intensity. We also show that the linear and the third-order absorption can be eliminated via the Raman gain, and the phase noise of the signal light can be ignored when the phase control light is applied in this hybrid scheme.

show abstract

“…DOI: 10.1088/0256-307X/33/12/124205 High power fiber lasers [1] with good beam quality are needed for a variety of applications such as in scientific research, national defense and medical surgery. However, to scale up the output power of a single amplifier to a higher power level is a problem confronting many challenges such as nonlinear effects, [2,3] thermal loading, [4] fiber damage, [5] pump brightness [6] as well as mode instability, [7−9] which limit the final laser output power. To bypass these fundamental restrictions, combining laser beams have been proposed to be an alternative approach for power and brightness scaling.…”

mentioning

confidence: 99%

Spectral Beam Combining of Fiber Lasers by Using Reflecting Volume Bragg Gratings

Zhou

Liang

et al. 2016

Chinese Phys. Lett.

View full text Add to dashboard Cite

By employing three reflecting volume Bragg gratings, a near-infrared 4-channel spectral-beam-combining system is demonstrated to present 720 W combined power with a combining efficiency of 94.7%. The combined laser beam is near-diffraction-limited with a beam factor 𝑀 2 ∼ 1.54. During this 4-channel beam-combining process, no special active cooling measures are used to evaluate the volume Bragg gratings as combining elements are under the higher power laser operation. Thermal expansion and period distortion are verified in a 2 kW 2-channel beam-combining process, and the heat issue in the transmission case is found to be more remarkable than that in the diffraction case. Transmitted and diffracted beams experience wave-front aberrations with different degrees, thus leading to distinct beam deterioration.

show abstract

Raman Suppression in a Kilowatt Narrow-Band Fiber Amplifier

Cited by 4 publications

References 16 publications

Fiber core mode leakage induced by refractive index variation in high-power fiber laser

Fiber core mode leakage induced by refractive index variation in high-power fiber laser

A low noise, high fidelity cross phase modulation in multi-level atomic medium*

Spectral Beam Combining of Fiber Lasers by Using Reflecting Volume Bragg Gratings

Contact Info

Product

Resources

About