Automatic electronic-controlled mode locking self-start in fibre lasers with non-linear polarisation evolution

Radnatarov, Daba; Khripunov, Sergey; Kobtsev, Sergey; Ivanenko, Aleksey; Kukarin, S. V.

doi:10.1364/oe.21.020626

Cited by 52 publications

(25 citation statements)

References 23 publications

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“…Similar LC−supported passively mode− −locked laser was very recently shown in Ref. 26 where LC cell was used to trigger the mode−locking operation. How− ever, with only one LC−cell, laser presented by Radnatarov et al still required manual polarization adjustment [26].…”

Section: Discussionmentioning

confidence: 71%

“…26 where LC cell was used to trigger the mode−locking operation. How− ever, with only one LC−cell, laser presented by Radnatarov et al still required manual polarization adjustment [26]. In the setup presented in this paper LC cells provide full po− larization control, thus mode−locking can be recovered even when physical layout of the cavity is modified.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Intracavity polarization control in mode-locked Er-doped fibre lasers using liquid crystals

Nikodem

Krzempek

Zygadlo

et al. 2014

Opto-Electronics Review

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In this paper we present a novel configuration of an NPR mode-locked Er-doped laser. This new optical setup uses voltage controlled LC cells to replace standard retarders (quarter-and half-waveplates) inside the laser cavity. Using this novel, mechanical-adjustment-free setup a mode-locking was obtained with sub-500 fs pulse duration and an average power exceeding 40 mW. Presented results show that using simple LC cells, an optical layout of an NPR mode-locked laser can be greatly simplified.

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Section: Discussionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 99%

Intracavity polarization control in mode-locked Er-doped fibre lasers using liquid crystals

Nikodem

Krzempek

Zygadlo

et al. 2014

Opto-Electronics Review

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show abstract

“…To date, singular diagnostics, e.g. the peak of the fundamental radio frequency (RF) spectrum or the maximal second harmonic power, have been utilized to evaluate fitness; however, these metrics have proven insufficient to repeatedly achieve mode-locking [4,5]. We propose a compound fitness function, based on the RF peak height and the width of the optical spectrum, providing improved suppression of undesirable regimes, with little computational overhead.…”

Section: Algorithm Developmentmentioning

confidence: 99%

Self-Optimizing Mode-Locked Laser using a Genetic Algorithm

Woodward

Kelleher

2016

Conference on Lasers and Electro-Optics

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“…In the "Select or enter command" of the "COM4" test panel, type "SM,500,3000\n" and click on the "Query" button. 4. Run the commercial polarimeter controlling software and start the polarization measurement by clicking on the "Start" button.…”

Section: Analyzing the Polarization Of The Output Signalmentioning

confidence: 99%

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Olivier

Gagnon

Habel

2016

JoVE

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When a laser is mode-locked, it emits a train of ultra-short pulses at a repetition rate determined by the laser cavity length. This article outlines a new and inexpensive procedure to force mode locking in a pre-adjusted nonlinear polarization rotation fiber laser. This procedure is based on the detection of a sudden change in the output polarization state when mode locking occurs. This change is used to command the alignment of the intra-cavity polarization controller in order to find mode-locking conditions. More specifically, the value of the first Stokes parameter varies when the angle of the polarization controller is swept and, moreover, it undergoes an abrupt variation when the laser enters the mode-locked state. Monitoring this abrupt variation provides a practical easy-to-detect signal that can be used to command the alignment of the polarization controller and drive the laser towards mode locking. This monitoring is achieved by feeding a small portion of the signal to a polarization analyzer measuring the first Stokes parameter. A sudden change in the read out of this parameter from the analyzer will occur when the laser enters the mode-locked state. At this moment, the required angle of the polarization controller is kept fixed. The alignment is completed. This procedure provides an alternate way to existing automating procedures that use equipment such as an optical spectrum analyzer, an RF spectrum analyzer, a photodiode connected to an electronic pulse-counter or a nonlinear detecting scheme based on two-photon absorption or second harmonic generation. It is suitable for lasers mode locked by nonlinear polarization rotation. It is relatively easy to implement, it requires inexpensive means, especially at a wavelength of 1550 nm, and it lowers the production and operation costs incurred in comparison to the above-mentioned techniques. Video LinkThe video component of this article can be found at

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Automatic electronic-controlled mode locking self-start in fibre lasers with non-linear polarisation evolution

Cited by 52 publications

References 23 publications

Intracavity polarization control in mode-locked Er-doped fibre lasers using liquid crystals

Intracavity polarization control in mode-locked Er-doped fibre lasers using liquid crystals

Self-Optimizing Mode-Locked Laser using a Genetic Algorithm

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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