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Showing 1 to 20 of 50 for “"gain medium"”.
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Amplified Total Internal Reflection at the Surface of Gain Medium
… been debate about whether amplified TIR froma medium exhibiting optical gain is possible, and desire for a theory to explain it.Authors have suggested theories both in favor and in doubt of the phenomenon’s ex-istence, and experimental evidence has arose supporting the existence and …
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A Cavity-stabilized diode laser for dipole trapping of ytterbium
Bad-cavity lasers using a gain medium with a narrower linewidth than the laser cavity have the potential to achieve very narrow linewidths and extremely long coherence times. Such lasers could serve as active frequency standards or enable very-long-baseline interferometric telescopes at optical …
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Hybrid laser with CMOS photonics
… integrated photonic resonators with an external gain medium, we are able to build a laser that offers a number of advantages including reducing the electrical and thermal load on the integrated chip socket, eliminating the challenges of integrating gain mediums into CMOS processes, allowing for …
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Band edge lasing in chiral nematic liquid crystals
… as the helix. A large increase in effective gain is seen for a fluorescent gain medium within the liquid crystal at the band edges, resulting in lasing. Applications of liquid crystal lasers could include miniature medical diagnostic tools, large-area holographic laser displays, and …
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Silicon-germanium saturable absorbers and erbium-doped waveguides for integrated mode-locked lasers
… Photonics Inc. to verify that it has enough gain to function as a gain medium of an on-chip laser. These components will be important as intermediate steps before finally integrating mode-locked laser.
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Low-cost, highly efficient, and tunable ultrafast laser technology based on directly diode-pumped Cr:Colquiriites
… technology based on diode-pumped Cr:Colquiriite gain media (Cr:LiCAF, Cr3+:LiSAF and Cr:LiSGaF). By using inexpensive single-mode diodes ($150) as the pump source, we have obtained continuous-wave (cw) output powers >250-mW with slope efficiencies >50%. Record cw tuning ranges were demonstrated …
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Erbium-ytterbium-yttrium compounds for light emission at 1.54[mu]m
… integrated circuit is a compact, high-gain and low power optical amplifier to compensate for signal attenuation due to propagation losses and to recover signal strength after subsequent 3dB splits during fanout of the optical signal to different microprocessors. Erbium ions (Er3+) are …
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Novel II-IV semiconductor nanocrystal gain media : from amplified spontaneous emission to lasing
… and provide an incentive to use them as a gain medium. Chapter 3 summarizes work done in developing a NC-based gain media and lists the stringent requirements for observing amplified spontaneous emission (ASE), a signature manifestation of gain. Then the synthesis of a robust NCs-titania, …
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Analysis and characterization of slab-coupled optical waveguide amplifiers and lasers
… optical waveguide (SCOW) semiconductor gain medium for use in high power optical amplifiers and external cavity lasers. The thesis begins by introducing the SCOW concept and describing the benefits of utilizing a low optical confinement design for high power operation. Detailed analysis …
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A NOVEL DESIGN OF AN ALL-OPTICAL BISTABLE DEVICE USING A SINGLE ACTIVE ELEMENT
… all-optical bistable device using only a single gain medium is studied theoretically as well as experimentally implemented in two schemes, optical ber and free space optics. In both cases, the circuits are implemented by means of ring resonators and the aim is to conrm the bistability behavior …
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Block copolymer photonic crystals : towards self-assembled active optical elements
… using a dye-doped polymers as the organic gain medium and the self-assembled block copolymer as the spectral-band selective distributed Bragg reflector feedback element.
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Nonlinear Optical Response of Simple Molecules and Two-Photon Semiconductor Lasers
… of a two-photon laser using a bulk semiconductor gain medium. Within the Born-Oppenheimer approximation, nonlinear refraction in molecular liquids and gases can arise from both bound-electronic and nuclear origins. Knowledge of the magnitudes, temporal dynamics, polarization and spectral …
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Dispersion-managed Breathing-mode Semiconductor Mode-locked Ring Laser
… are stretched before entering the semiconductor gain medium to minimize the detrimental strong integrating self-phase modulation and to enable efficient pulse amplification. Subsequently compressed pulses facilitate bleaching the semiconductor saturable absorber. The intracavity pulse compression …
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Automated SG-DBR Tunable Laser Calibration Optimized for Optical Coherence Tomography Applications
… of tunable SG-DBR lasers by implementing a gain medium voltage sensing algorithm, as opposed to the previous inefficient manual efforts.</p> <p>Experimental OCT tests are also performed by utilizing a Mach-Zehnder interferometer as a device under test to verify the accuracy of the laser …
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Simulation, Fabrication, and Characterization of Semiconductor Lasers
… into two sections. One section acts as the 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 …
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Slow and Fast Light Using Quantum-Dot and Quantum-Well Semiconductor Optical Amplifiers
… using population oscillation in an absorptive medium. Bandwidth tuning of slow light is observed with forward and reverse bias of quantum-dots. Second, the study explores four-wave mixing and population oscillation in a quantum-well gain medium. Control of optical advance and bandwidth is …
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Fabrication and Characterization of Electrically Injected Photonic Crystal Light Emitters
… crystal light emitters with spatially localized gain are explored with the goal of understanding the optical and electrical characteristics of these devices from theoretical and experimental perspectives. Localization of the quantum well layer into the defect region of the photonic crystal allows …
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Low threshold random lasing from phase separated optical fibers.
… core – silica cladding as the feedback medium, is proposed and presented. The core exhibits greatly enhanced Rayleigh scattering, therefore requiring a significantly reduced length of scattering fiber (4 m) for lasing. The enhanced Rayleigh scattering was verified through measurements …
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Stabilization techniques and silicon-germanium saturable absorbers for high repetition rate mode-locked lasers
… integration of the absorber with the laser gain medium of future compact mode-locked lasers. A wafer-scale Si-SiO2 high reflector with 99.8% peak reflectance and an unprecedented bandwidth of 700 nm in the near-infrared serves as the substrate of a saturable Bragg reflector, while a …
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External Cavity Multiwavelength Semiconductor Mode-locked Laser Gain Dynamics
… division multiplexing applications. The gain medium in external cavity semiconductor mode-locked lasers is a semiconductor optical amplifier (SOA), and passive and hybrid mode-locked operation are achieved by the introduction of a saturable absorber (SA) in the laser cavity. Pump-probe …
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