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Showing 1 to 20 of 20 for “"ultrashort pulses"”.
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Switching and generation of ultrashort pulses using all-fibre devices
… for the manipulation and generation of ultrashort pulses. Detailed analysis of soliton switching in a single NOLM and cascade of two NOLM's is performed, centering on primary limitations to device operation, effect of cascading on amplitude response, and impact of switching on the …
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Generation and storage of ultrashort pulses using optical fiber devices
… fiber laser was demonstrated to generate 1.8 nJ pulses that were compressible to sub-100 fs. 980-nm pumping requirements for this laser were only 200 mW. Lastly, the first observation and characterization of resonant sideband formation in stretched-pulse fiber lasers was completed. Experimental …
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An overview of laser operation and modelocking of a vertical external cavity surface emitting laser (VECSEL)
… intra-cavity frequency doubling, tunability, and ultrashort pulses generated from passive mode-locking. In this work, we give a brief overview of the VECSEL structure, previous VECSEL literature, how lasing in a VECSEL works, and how mode locking in a VECSEL works.
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Lūžio rodiklio modifikavimas stikluose ir kristaluose veikiant ultratrumpaisiais lazerio impulsais /
… index modification of transparent materials with ultrashort laser pulses is presented in this dissertation. Based on experimental data it was demonstrated, that using ultrashort pulses, generated with Yb:KGW laser system, it is possible to produce modified refractive index zones in the fused …
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Control and detection of complex fields in spatio-temporal optical systems
… described, and the production of programmable ultrashort pulses with sub-picosecond temporal resolution and diffraction-limited spatial resolution is demonstrated. Applications of these techniques in microscopy, communications, and quantum dynamical control are also considered.
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Fabrication and applications of fibre Bragg gratings
… elements in modelocked fibre lasers producing ultrashort pulses. A chirped fibre grating Fabry-Perot transmission filter is used in a continuous wave laser that exhibits eleven simultaneously lasing wavelengths. Finally, the use of grating-coupler devices as variable reflectivity mirrors for …
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Selective heating of multiple nanoparticles as a new strategy for controlled release applications
… The irradiation of femtosecond laser pulses on the absorbing gold nanorods provides the answer to this limitation due to the very high-power of energy delivery through these ultrashort pulses. We developed gold nanorod surface customization technique to enable DNA - nanorod …
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The development of high power, pulsed fiber laser systems and their applications
… the generation and amplification of high energy ultrashort optical pulses. However, these potential advantages of Yb-doped silica fiber as a gain and nonlinear medium for mode-locked lasers and ultrashort pulse amplifiers have been less well studied, and it was not until 1999 that significant …
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Nonlinear Light - Matter Interactions of Ultrafast High Intensity Laser Pulses
… from the interactions of intense ultrafast laser pulses with various states of matter. These interactions involve electronic and molecular states and yield new information on the underlying fundamental processes that govern the molecular world. Modern day lasers offer ultrashort pulses, high …
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PROBING BAND MAGNETISM IN DIFFERENT DIMENSIONS: ENERGY, SPIN AND TIME-RESOLVED STUDIES
… infrastructures to generate visible, UV and EUV ultrashort pulses (tabletop lasers and HHG at NFFA-SPRINT laboratory) and soft X-ray synchrotron light (at Elettra, Diamond and ESRF synchrotron light sources). I used photoemission as the main tool in my investigation, supplementing my results with …
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Frequency-resolved optical gating in periodically-poled lithium niobate waveguide devices
… for the intensity and phase characterisation of ultrashort optical pulses. Essentially, FROG involves mixing an ultrashort optical pulse with its time-delayed replica, or another pulse, in a nonlinear material or device to yield a two dimensional data set called a spectrogram, from which the …
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Damages in Transparent Materials by Ultrashort Laser Pulse
Ultrashort lasers that generate laser pulses down to picosecond and femtosecond range have advanced over the past decade from delicate lab systems to robust industry machines. The availability of stable ultrashort laser systems opens up a wide range of exciting applications from transparent …
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Frequency conversion in nonlinear optical waveguides : from classical to quantum applications
… power efficiency, including operation with ultrashort pulses for a variety of wavelengths to suit a wide range of perspective application requirements. It also shows an approach for simple and energy efficient spatio-temporal optical signal control, which can find applications in next …
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Frequency conversion in nonlinear optical waveguides : from classical to quantum applications
… power efficiency, including operation with ultrashort pulses for a variety of wavelengths to suit a wide range of perspective application requirements. It also shows an approach for simple and energy efficient spatio-temporal optical signal control, which can find applications in next …
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Mode-locked laser diodes for the 750 – 770 nm spectral region
Ultrashort pulse lasers are widely used in research, industry, medicine, and communications, because of their characteristics of narrow pulse width, high repetition frequency, broad spectrum and high peak power. They are influencing and changing our world. Mode-locking is an effective way to …
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Cyclostationary statistical optics
Pulsed, optical fields are treated theoretically within the framework of cyclostationary random processes. Propagation-induced effects for stochastic, pulsed fields that are either beam-like or plane waves are examined in the context of interferometric and spectroscopic measurements. Propagation of …
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Intracavity coherent interaction of mode-locked pulse train with resonant medium
… of interaction between the Rb-87 vapor and the ultrashort pulses occurred within a short time scale compared to the atomic relaxation times, which results in nonlinear propagation of the pulses as well as an observation of the dark-line resonance inside the laser cavity. A Fabry-Perot etalon is …
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COMPLETE TEMPORAL MEASUREMENT OF LOW-INTENSITY AND HIGH-FREQUENCY ULTRASHORT LASER PULSES
Two important frontiers in the field of ultrashort pulse measurement are the complete temporal measurement of low-intensity picosecond pulses in the near-infrared (NIR) and intense ultrashort pulses in the ultraviolet (UV) and extreme ultraviolet (EUV). The former are projected to find great use in …
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Coherent Control of Molecular Dynamics with Shaped Femtosecond Pulses
… quantum mechanical systems with suitably shaped ultrashort laser fields. The coherence properties of the laser field are exploited to achieve constructive interference for a predefined target wave function via a phasecorrect superposition of wave functions. The goal of coherent control, the …
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High speed mask-less laser-controlled precision micro-additive manufacture
… of the study was that (1) ultrafast laser pulses have smaller heat affected zones thus the deposition resolution would be higher, (2) the ultrashort pulses are absorbed in most materials (including those transparent to the continuous wave light at the same wavelength) thus the deposition …