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Showing 1 to 16 of 16 for “"Saturable Absorbers"”.
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Silicon-germanium saturable absorbers and erbium-doped waveguides for integrated mode-locked lasers
In this thesis, Silicon-Germanium (SiGe) Saturable Bragg Reflectors (SBR) and Erbium-doped waveguide chips are fabricated and characterized as crucial components for integration of a mode-locked laser on a Si-chip. The SiGe-SBR is designed to be compatible with Si-based fabrication processes for …
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Development and application of saturable absorbers to femtosecond solid-state laser mode-locking
Semiconductor saturable absorbers have had a major impact on the field of ultrashort pulse generation by increasing the stability and reliability of ultrashort pulse lasers, making them more useful in many applications. These versatile devices can be grown both epitaxially with molecular beam …
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Stabilization techniques and silicon-germanium saturable absorbers for high repetition rate mode-locked lasers
… instabilities and the lack of integrable saturable absorbers to date. In this thesis we demonstrate in theory and experiment that active feedback electronics controlling the intracavity loss of the laser is capable of suppressing the Q-switching instability. We introduce a control system's …
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The effect of proton bombardment on semiconductor saturable absorber structure
… bombardment of InGaAs/InP-based semiconductor saturable absorbers was studied experimentally, using a standard degenerate, cross-polarized pump-probe technique. Proton bombardment reduced carrier lifetimes by as much as a factor of 40 at low optical excitation densities. For high fluences, …
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Amorphous silica-based carbon nanotube and silver nanoprism coatings: synthesis and investigation of their optical properties /
… in ethanol is obtained with surfactant P4VP. Saturable absorption experiments showed better performance of semiconductive SWCNT compared to unsorted ones – they have lower non-saturable loses and lower saturation power. SWCNT-silica composite coatings show higher thermal stability compared to …
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Engineering light using large area photonic crystal devices
… has played a key role: 1) large area broadband saturable Bragg reflectors, and 2) large area 2D photonic crystal devices. Saturable Bragg reflectors (SBRs) can be used to self-start ultra-short pulse generation in a variety of solid state and fiber lasers. To form shorter pulses, SBRs with …
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Studies of third-order nonlinearities in materials and devices for ultrafast lasers
… been developed for such applications. Broadband saturable absorbers based on III/V and Si materials systems were developed for femtosecond lasers and have high reflectivity over 200 to 300 nm bandwidths. These absorbers were designed for modulation depths ranging from 0.3% to 18%. Self-starting …
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Femtosecond pulse generation in surface-emitting semiconductor lasers
… also allow for the insertion of semiconductor saturable absorber mirrors (SESAMs) for modelocking. Mode-locked VECSELs have surpassed the performance of other types of mode-locked semiconductor laser, with modelocking via the optical Stark effect allowing VECSELs to produce sub-picosecond …
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Numerical modelling of dispersion managed soliton transmission
… thesis covers two main areas; (i) the use of a saturable absorber to control the propagation of dispersion managed solutions and (ii) the upgrade of the installed standard fibre network to higher data rates through the use of solitons and dispersion management. Saturable absorbe can be used to …
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Printable 2d Material Optoelectronics and Photonics
… used to develop nonlinear photonic devices (i.e. saturable absorbers for femtosecond pulsed laser generation) and visible to near-infrared photodetectors (e.g. MoS$_2$ and BP/graphene/silicon hybrid photodetectors). Beyond inkjet printing, I present an ink formulation of commercial graphene …
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Two-dimensional material inks and composites for printed electronics and energy
… liquid phase exfoliated graphene to create THz saturable absorbers (SAs) which could enable many applications in THz frequencies such as tomography or time-resolved spectroscopy that require mode-locked (i.e. enabling a train of short pulses to be derived from continuous-wave operation) THz …
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Novel techniques and materials for optical telecommunication systems
… using state-of-the-art (wavelength-selective) saturable absorbers.
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Dynamics of a Q-switched all-fibre laser
… on Q-switching lasers with different kinds of saturable absorbers. Finally, we demonstrate experimentally for the first time excitability in an all-fibre laser with saturable absorber experimentally; this is supported by careful numerical considerations. Experiments and numerical investigations …
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High-Energy YB-Doped Femtosecond Fiber Lasers
… on studying the impact of the parameters of the saturable absorber and the bandwidth of the lumped spectral filter on the temporal and spectral profiles of the pulse. Therefore, I developed two models that can help us to optimize the pulse characteristics such as the pulse energy, spectral …
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Quantum dot based semiconductor disk lasers
… QDs were also used as a base for semiconductor saturable absorbers in modelocking experiments.During the time of these studies, QD SDLs at new spectral regions and record output power were demonstrated. Power scaling up to 6 W was achieved for 1040 nm, 2.25 W for 1180 nm and 1.6 W for 1260 nm …