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Showing 1 to 20 of 38 for “"Saturable Absorber"”.
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Novel saturable absorber materials and devices for laser modelocking
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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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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Novel saturable absorber devices grown using RF and magnetron RF sputtering
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber
… a passively Q-switched fiber laser is by using a saturable absorber (SA). Passively Q-switched fiber laser is the most desirable pulse in laser technology due to its ability to generate optical pulses in microsecond and nanosecond. The aim of this study is to construct a single ring erbium-doped …
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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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Development of ultrashort pulse fiber lasers for optical communication utilizing semiconductor devices
The nonlinear reflectivity of semiconductor saturable absorber mirrors is investigated with ultrafast time-resolved and time-averaged reflectivity measurements. The relative contributions of absorption bleaching and induced absorption are studied as a function of fluence and wavelength. The impact …
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Study on dynamic behavior of ring-cavity quantum-cascade lasers with group velocity dispersion
… that accounts for GVD effect and a background saturable absorber is developed based on Maxwell-Bloch equations. Stability analysis of a ring cavity QCL is performed through the linearization of dynamic equations. Depending on the results of stability analysis, the numerical simulation for …
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Novel broadband light sources and pulse generation techniques at 1.5 [mu]m
… first two fall into the same broader class of saturable absorber mirrors - one device was developed for low-repetition-rate sub-100-fs ultrafast lasers and the other for high-repetition- rate femtosecond lasers. The third device bypasses generating broadband light directly from a laser …
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Compact Femtosecond Lasers for Multiphoton Imaging
… Finally, a new concept of DBR-free semiconductor saturable absorber based on the membrane technology was suggested. For the first time a membrane saturable absorber structure grown using MOVPE and processed via lateral etching is realized. This membrane saturable absorber was used to mode-lock a …
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True linearized intensity modulation for photonic analog to digital conversion using an injection-locked mode-locked laser
… of the gain section or the voltage of the saturable absorber section of the slave laser has been used to apply the modulation signal. A spur free dynamic range of 70 dB.Hz2/3 is achieved when modulating the modulator through the saturable absorber. Modulating the saturable absorber provides …
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The development of components for ultrafast all-optical communication networks
… of ultrashort pulse generation. A semiconductor saturable absorber mirror is a monolithically integrated device utilized for passive mode-locking of a wide variety of lasers. The development of SOAs as well as semiconductor saturable absorber mirrors is discussed.
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Attosecond timing jitter modelocked lasers and ultralow phase noise photonic microwave oscillators
… are developed with the help of semiconductor saturable absorber technology, efficient dispersion compensation mirror design algorithms, and heat management of the saturable absorber. The I-GHz Cr:LiSAF oscillator generates 55-fs pulses with 110 pJ pulse energy, which represents almost two …
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Linear-cavity tunable fibre lasers employing an Opto-VLSI processor and a MEMS-based device
… the use of a section of un-pumped EDF as a saturable absorber (SA), which suppresses noise spikes caused by the high optical pumping power. Experimental results show that by optimising a length of the SA a single wavelength, high power laser signal can be achieved. In addition, we …
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Dispersion-managed Breathing-mode Semiconductor Mode-locked Ring Laser
… pulses facilitate bleaching the semiconductor saturable absorber. The intracavity pulse compression ratio is higher than 50. Down chirping when compared to up chirping allows broader mode-locked spectra and shorter pulse generation owing to temporal and spectral semiconductor gain dynamics. …
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Investigation of intracavity phase interferometry applied to nano-metrology
… mode-locked by a multiple quantum wells (MQW) saturable absorber. The presence of a solid state saturable absorber introduced a dead band in the beat note response of the system. A new coupling between group and phase velocity was discovered experimentally, and explained through simulation. …
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Simulation, Fabrication, and Characterization of Semiconductor Lasers
… gain medium and the other section works as the saturable absorber thus providing passive modelocking. The measured threshold current for BAL is around 140 mA whereas it is 26 mA and 36 mA for ridge waveguide and passively mode locked laser respectively for 1 mm cavity length. The threshold …
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High repetition rate fiber and integrated waveguide femtosecond lasers
… and important design guidelines are provided. As saturable Bragg reflectors are crucial in all of the described systems to enable mode-locking, saturable absorber optimization is discussed and their optical performance compared. Thus, this research paves the way for compact, affordable high …
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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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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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Toward single-cycle optical pulses
… laser mode-locked by a semiconductor saturable absorber is designed and implemented. The output spectrum spans from 1080 nm to 1500 nm range, and has a 3-dB bandwidth of 90 nm. This is the broadest spectrum from a prismless Cr:forsterite laser to our best knowledge, and corresponds to …
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