Intracavity coherent addition of 16 laser distributions

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

doi:10.1364/ol.31.000350

Cited by 36 publications

(19 citation statements)

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“…per pulse [7]. Until now, intra-cavity coherent combining has only been demonstrated with flat or concave rear mirrors and a flat or concave output coupler.…”

Section: Lettermentioning

confidence: 99%

Misalignment sensitivity in an intra-cavity coherently combined crossed-Porro resonator configuration

et al. 2017

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We investigate the misalignment sensitivity in a crossed-Porro resonator configuration when coherently combining two pulsed multimode Nd:YAG laser channels. To the best of our knowledge, this is the first reported study of this configuration. The configuration is based on a passive intra-cavity interferometric combiner that promotes self-phase locking and coherent combining. Detailed misalignment sensitivity measurements are presented, examining both translation and angular deviations of the end prisms and combiner, and are compared to the results for standard flat end-mirror configurations. The results show that the most sensitive parameter in the crossed-Porro resonator configuration is the angular tuning of the intra-cavity interferometric combiner, which is ~±54 µrad. In comparison, with the flat end mirror configuration, the most sensitive parameter in the resonator is the angular tuning of the output coupler, which is ~±11 µrad. Thus, with the crossed-Porro configuration, we obtain significantly reduced sensitivity. This ability to reduce the misalignment sensitivity in coherently combined solid-state configurations may be beneficial in paving their way into practical use in a variety of demanding applications.

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“…per pulse [7]. Until now, intra-cavity coherent combining has only been demonstrated with flat or concave rear mirrors and a flat or concave output coupler.…”

Section: Lettermentioning

confidence: 99%

Misalignment sensitivity in an intra-cavity coherently combined crossed-Porro resonator configuration

et al. 2017

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“…An additional benefit of this scheme is that because all beamlets share the same resonator at the output coupler, there is generally no need for active phase control at the output end. A total of 16 beamlets originating from the same laser rod have been added in this manner generating an overall spectral brightness increase of thirty times (Eckhouse et al, 2006).…”

Section: Coherent Beam Combiningmentioning

confidence: 99%

Spectral Narrowing and Brightness Increase in High Power Laser Diode Arrays

Wetter¹

2012

Semiconductor Laser Diode Technology and Applications

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“…Due to high radiation intensities inside a fibre, optical breakdown and nonlinearities are limiting the power extractable from a single fibre laser. A convenient approach to coherent addition of fibre lasers is based on the use of a multi-arm resonator in an interferometer configuration [1][2][3][4][5][6][7][8][9][10]. The coherent combining takes place due to self-organization in laser generation that ensures amplification of resonator modes with the lowest losses.…”

Section: Introductionmentioning

confidence: 99%

“…Michelson and MachZehnder type resonators have been successfully used to reach nearly 100% combining efficiency of two fibre lasers. Coupling was obtained when two amplifying fibres shared a common output mirror located on one port of a standard 50/50 coupler which mixed both optical beams [1][2][3][4][5][6][7][8][9]. When beams of the two input ports of the beam splitter had the correctly fixed relative phase, they interfered constructively at the output port.…”

Section: Introductionmentioning

confidence: 99%

Coherent addition of orthogonally polarized fibre lasers with high combining efficiency

Regelskis¹,

Gavrilinas²,

Trusovas³

et al. 2010

Lithuanian J. Phys.

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We demonstrate a free-space combining of two orthogonally polarized fibre lasers by using polarization selective loss and a common adjustable output coupler. The lasers were locked coherently in phase in such a way that the combined beam experienced a minimal cavity loss. In contrast to a conventional coherent locking scheme due to interference, when combined beams are of the same polarization state, this scheme has the advantage of easy tunability in the output power, providing high combining efficiency even when the power of both fibre lasers is highly imbalanced. A high combining efficiency of the fibre laser beams was achieved by the coherent polarization locking method. In comparing the output power of both free-running fibre lasers with the output power in coherently locked state, it was observed that the combining efficiency exceeded 100%. The output power enhancement was due to the difference in optimal feedback conditions for separate free-running lasers. One laser was additionally seeded from the second laser, and the seeding originated the higher output power of coherently added lasers. The combining efficiency estimated by comparing the output of all optimized lasers was as high as 95.2%. As the resulting combined beam has linear polarization, the approach can be applied for combining a desirable number of fibre lasers.

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Intracavity coherent addition of 16 laser distributions

Cited by 36 publications

References 0 publications

Misalignment sensitivity in an intra-cavity coherently combined crossed-Porro resonator configuration

Misalignment sensitivity in an intra-cavity coherently combined crossed-Porro resonator configuration

Spectral Narrowing and Brightness Increase in High Power Laser Diode Arrays

Coherent addition of orthogonally polarized fibre lasers with high combining efficiency

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