Multi-Wavelength Fiber Lasers

Pérez-Herrera, Rosa Ana; López-Amo, Manuel

doi:10.5772/53398

Cited by 6 publications

(4 citation statements)

References 109 publications

(117 reference statements)

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“…Locking of a specific wavelengths using self-injection locking scheme takes place if the free spectral range (FSR) of the laser cavity is an integer multiple of that of the external cavity; in other word, roundtrip phase matching condition should be satisfied. This phenomenon follows the relation between FSR and the cavity length as shown in (1).…”

Section: A Tunable Wavelength Generationsupporting

confidence: 60%

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Single and Multiple Longitudinal Wavelength Generation in Green Diode Lasers

Shamim

Ooi

et al. 2019

IEEE J. Select. Topics Quantum Electron.

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Single and multiple wavelength laser systems are presented that employ self-injection locked InGaN/GaN green laser diode in an external cavity configuration with a partially reflective mirror. A stable and simultaneous locking of up to 4 longitudinal Fabry-Perot modes of the system cavity is demonstrated with appreciable signal-to-noise-ratio (SNR) of ~13 dB and average mode linewidth of ~150 pm. The multiwavelength spectrum exhibited a flat-top emission with nearly equal power distribution among the modes and an analogous mode spacing of ~0.5 nm. This first demonstration of multiwavelength generation source is highly attractive in a multitude of cross-disciplinary field applications besides asserting the prospects of narrow wavelength spaced multiplexed visible light communication. Moreover, an extended two-stage self-injection locked near single wavelength visible laser system is also presented. An ultra-narrow linewidth of ~34 pm is realized at 525.05 nm locked wavelength from this innovative system, with ~20 dB side-mode-suppression-ratio (SMSR); thus signifying a paradigm shift towards semiconductor lasers for near single lasing wavelength generation, which is presently dominated by other kinds of laser technologies.

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Section: A Tunable Wavelength Generationsupporting

confidence: 60%

“…ISIBLE single/multiple longitudinal wavelength sources are invaluable for various multi-disciplinary field applications [1]. In particular, they are indispensable sources in optical communications, medical diagnostics, optical cloaking, metrology, precision spectroscopy, bio-sensing, microwave photonics, etc.…”

Section: Introductionmentioning

confidence: 99%

Single and Multiple Longitudinal Wavelength Generation in Green Diode Lasers

Shamim

Ooi

et al. 2019

IEEE J. Select. Topics Quantum Electron.

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“…These fiber laser sources have also been employed in fiber optic testing, fiber sensors, measurement of wavelength division multiplexing (WDM) components, and spectroscopy [1][2][3]. The requirements of WDM systems are: large number of channels over a large wavelength span; moderated output power (of the order of 100 µW per channel), with power distributed uniformly over channels; stable, fixed wavelength spacing; and small power variation with high side-mode suppression ratio (SMSR) for each individual channel [4,5]. The main challenge in producing stable multi-wavelength lasing in erbium-doped fiber ring lasers (EDFRL) is the strong mode competition induced by the fact that erbium ions saturate mostly homogeneously at room temperature [4,6].…”

Section: Introductionmentioning

confidence: 99%

“…The requirements of WDM systems are: large number of channels over a large wavelength span; moderated output power (of the order of 100 µW per channel), with power distributed uniformly over channels; stable, fixed wavelength spacing; and small power variation with high side-mode suppression ratio (SMSR) for each individual channel [4,5]. The main challenge in producing stable multi-wavelength lasing in erbium-doped fiber ring lasers (EDFRL) is the strong mode competition induced by the fact that erbium ions saturate mostly homogeneously at room temperature [4,6]. The key of successful operation of multi-wavelength EDFRL is the suppression of mode competition.…”

Section: Introductionmentioning

confidence: 99%

Erbium-doped fiber ring laser with wavelength selective filter based on non-linear photonic crystal fiber Mach–Zehnder interferometer

Khaleel

Al‐Janabi

2017

Laser Phys.

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A high output power, stable wavelength spacing and switchable multi-wavelength erbiumdoped fiber laser has been demonstrated experimentally using a combination of non-linear photonic crystal fiber Mach-Zehnder (MZI) interferometer with polarization dependent loss effect. This MZI functions together with a polarization controller (PC) as a wave selecting filter (WSF). Adjusting the PC within the WSF part gives rise to three emissions as single, dual and triple wavelengths. Multi-wavelength laser with maximum spacing of 1.6 nm was achieved by controlling the polarization state in a ring cavity. Such stable wavelength spacing aroused interest in wavelength-division-multiplexer systems. Output power around −3 dB at 1550 nm wavelength, with small power fluctuation for each line, was recorded at room temperature. The measured 3-dB laser line-width was 0.03 nm, with a high side-mode suppression ratio of 48 dB.

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An approach to modelling defocusing and keyhole reflectivity in keyhole laser processes

Stavropoulos,

Pastras,

Tzimanis

et al. 2024

Int J Adv Manuf Technol

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Keyhole laser-based processes have been adopted widely due to the high-quality welds and cuts that they produce and the accurately controlled dimensions of the end part. Fast-running simulation tools are required in order to estimate the dependence of process outputs, efficiency, and stability on the process variables. This work presents a fast-running simulation tool for keyhole laser-based processes with inert or no assisting gas that takes into account the effect of laser beam defocusing and the alteration of the effective reflectivity of the material due to the keyhole cavity. The model is built upgrading a successful model for the thermal phenomena based on finite differences and the enthalpy method. The presented model is compared to experimental results for the laser cutting process with both CO$$_2$$ 2 and fiber laser sources and inert assisting gas. The model accurately predicts cutting depth and kerf, heat-affected zone width, and the dependence of the cutting depth on the position of the focal plane. The model manages to achieve reduced computational time enabling its utilization in process digital twins.

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Multi-Wavelength Fiber Lasers

Cited by 6 publications

References 109 publications

Single and Multiple Longitudinal Wavelength Generation in Green Diode Lasers

Single and Multiple Longitudinal Wavelength Generation in Green Diode Lasers

Erbium-doped fiber ring laser with wavelength selective filter based on non-linear photonic crystal fiber Mach–Zehnder interferometer

An approach to modelling defocusing and keyhole reflectivity in keyhole laser processes

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