Intracavity coherent addition of single high-order modes

Ishaaya, Amiel A.; Eckhouse, Vardit; Shimshi, Liran; Davidson, Nir; Friesem, Asher A.

doi:10.1364/ol.30.001770

Cited by 10 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By further analysis, we deem that the result can be optimized much more by changing the grating with different reflectivity rate. In all previous references, such as [3][4], [7], [9] referenced by this article, their combined efficiencies are all calculated by P coherent /(P 1 +P 2 ). All the results reach to more than 90%, but less than 1.0 without any exception.…”

Section: Fig1 the Setup Of Intra-cavity Coherence Of Two Branch Fibementioning

confidence: 99%

“…Henceforth, some relevant improvements were made. One of the improvements was the intra-cavity cou- * * Email: jbelle@mail.nankai.edu.cn pling of two or N beams of light [3][4][5][6][7] . But the work mainly concentrated on the power combining of two beams of light.…”

mentioning

confidence: 99%

“…But the work mainly concentrated on the power combining of two beams of light. Later on, the scheme of Kozlov was developed further, and the Mach-Zehnder coherent laser resonator via a fiber coupler was reported [4,5] . At the same time,a large amount of research work was done on many factors that would impact the combination of laser, such as phase deviation and compensation [6] , the different impaction on the coherent laser combining of intra-cavity combination, extra-cavity combination and etc.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Novel intra-cavity self-organization coherent erbium-doped fiber laser

Jia

Liu

et al. 2007

Optoelectron. Lett.

View full text Add to dashboard Cite

A novel all-fiber self-organization coherent Erbium-doped fiber laser is proposed and demonstrated. The laser system is composed of two independent lasers. When each of the two branch lasers operates independently, the output power is 10. 41mW and 8.69 mW respectively. By adjusting a polarization controller (PC), the two lasers achieve coherent coupling, and the output power is 24.4 mW, which is more than two times that the single laser yields. Furthermore, we bring forward and discuss the factor estimating the effect of coherent combination-coherent coupling factor. The value of growth factor to evaluate the effect of coherent combining is 1.27. The coherent fiber laser has the advantages of simple structure, high efficiency and single frequency, which conduce to coherent coupling easily.

show abstract

Section: Fig1 the Setup Of Intra-cavity Coherence Of Two Branch Fibementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Novel intra-cavity self-organization coherent erbium-doped fiber laser

Jia

Liu

et al. 2007

Optoelectron. Lett.

View full text Add to dashboard Cite

show abstract

“…Therefore, the coherent combination array of multiple fibre lasers, each with moderate power, is considered as an effective way to obtain high output power. In recent years, several approaches have been demonstrated in the combining of multiple fibre lasers including the master oscillator power amplifier (MOPA) system [2,3], the fibre coupler combining method [4], the selfimaging confocal resonator [5,6] and the Michelson cavity [7] etc. Mutual injection phase-locking is a scaled-up technique for coherent combine multiple fibre lasers in the recent two years, which was first demonstrated by two erbium-doped singlemode fibre lasers using two fibre splitters for energy injection [8].…”

mentioning

confidence: 99%

Mutual injection-locking of two individual double-clad fibre lasers

Liu¹,

Chen²,

et al. 2009

Electron. Lett.

View full text Add to dashboard Cite

Phase-locking and coherent beam combination of two individual double-clad fibre lasers by a novel extra-cavity mutual injectionlocking method are proposed and experimentally demonstrated. Steady interference stripes with high contrast ratio (about 0.5) are observed. The output power of the phase-locked array exceeds 11 W and the power-combining efficiency is about 80%. No power-restriction optical components are utilised in the phase-locking experiment and the output power can be further up-scaled.Introduction: Recent advances in high-power fibre lasers have shown that fibre lasers are one of the most efficient lasers and the output power of a single-fibre laser has exceeded the kilowatt level [1]. To scale-up the output power of a single-fibre laser to higher power level, one has to face significant challenges including nonlinear effects, thermal effects, and fibre damage, etc. Therefore, the coherent combination array of multiple fibre lasers, each with moderate power, is considered as an effective way to obtain high output power. In recent years, several approaches have been demonstrated in the combining of multiple fibre lasers including the master oscillator power amplifier (MOPA) system [2, 3], the fibre coupler combining method [4], the selfimaging confocal resonator [5,6] and the Michelson cavity [7] etc. Mutual injection phase-locking is a scaled-up technique for coherent combine multiple fibre lasers in the recent two years, which was first demonstrated by two erbium-doped singlemode fibre lasers using two fibre splitters for energy injection [8]. The mutual injection phaselocking method does not need to inspect and control either the fibre laser's phase or the fibre-length and the intensity of the individual lasers, and it can lead to a new architecture for high-power laser systems. In their experiment, though steady interference stripes were observed, the output power of their array was limited at milliwatt level because the fibre splitters cannot bear high power, hence their architecture can not be scaled up to high power output.In this Letter, we propose and demonstrate a novel extra-cavity mutual injection-locking method to realise phase-locking of two double-clad fibre lasers. The mutual injection structure consists of a beam splitter and a corner cube, with no other power-restriction optical components being utilised. This mutual injection structure can break through the power restriction of fibre splitters, which were utilised in [8]. In our experiment, steady interference stripes with high contrast ratio (about 0.5) were observed and more than 11 W of coherent output power was achieved with combining efficiency of 80%. To the best of our knowledge, this is the first report of mutual injection-locking of two double-clad fibre lasers. Successful attempts at phase-locking with the high output power of our experiment show that this kind of mutual injection-locking technique is a promising technique for fibre laser coherent combination.

show abstract

“…Although the experiments were performed using transverse Gaussian laser distributions, the method can be successfully applied to coherently add many single high-order mode laser distributions as well as to multimode operation, as demonstrated before for two laser distributions. 17,18…”

mentioning

confidence: 99%