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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Frequency Comb"”.
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Terahertz optical frequency comb generation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Optical frequency comb generation in optical fibres
Optical frequency combs (OFC) constitute an array of phase-correlated equidistant spectral lines with nearly equal intensities over a broad spectral range. The adaptations of combs generated in mode-locked lasers proved to be highly efficient for the calibration of high-resolution (resolving power …
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Wideband and fast THz spectrometer using dual-frequency-comb on CMOS
… mixture analysis. Here, a 220-to-320 GHz dual-frequency-comb spectrometer in 65-nm bulk CMOS is presented, along with a systematic analysis on fundamental issues of rotational spectrometer, including the impacts of various noise mechanisms, gas cell, molecular properties, detection sensitivity, …
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3 GHz Yb-fiber laser based femtosecond sources and frequency comb
… ratio and reduce data acquisition time. In the frequency domain, a higher repetition rate means the comb line spacing is larger. This permits access to and manipulation of each individual comb line. Such capabilities have opened numerous frequency-domain applications including optical arbitrary …
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Monolithically integrated, high coherence frequency comb generation through on-chip gain switching
… networks are being widely considered. Optical frequency comb sources have the potential to reduce or eliminate the spectrally inefficient guard bands that are currently used to prevent cross-talk between adjacent channels. With their common laser source and fixed phase relation, frequency combs …
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Phase Noise Characterization of a Mode-Locked Quantum-Dot Coherent Optical Frequency Comb Source Laser
… channels require an individual optical carrier frequency to be generated from a discrete high-performance tunable laser. These arrays of discrete lasers are an expensive component in the transmitter of an optical communication channel. Thus, recent research has investigated an alternative laser …
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Wideband optical frequency comb generator using a phase velocity-matched lithium tantalate electro-optic modulator
A wideband optical frequency comb generator can be built using an electro-optic modulator that is driven at a frequency of several GHz and that is enclosed in an optical cavity. When light is circulated within the optical cavity, multiple passes through the modulator produce a spectrum centered at …
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Parametric Frequency Comb Generation In Visible And Mid-Infrared Wavelengths With Integrated Silicon Nitride Ring Resonators
… will focus on the nonlinear process of optical frequency comb generation, engineered for wavelengths outside of the standard telecom regime. In Chapter 1, we will begin with overall motivation for the field of silicon photonics. We will introduce basic theory of the origin of nonlinearity and …
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Self-referenced 1.5 [mu]m fiber frequency combs at GHz repetition rates
… advances in recent years to the optical frequency comb, particularly frequency combs deriving from solid-state and fiber architectures, have enabled a host of important new applications to emerge - applications which include optical arbitrary waveform generation (OAWG), high-speed …
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Applications and noise properties of high repetition rate : TiSapphire frequency combs
… and potential for linking the optical and radio frequency domains when these lasers are configured as frequency combs. Ti:Sapphire based mode-locked lasers offer considerable advantages over other laser systems by generating both the broadest optical spectrum and highest fundamental pulse …
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Octave-spanning lasers for optical metrology applications
This thesis describes the first octave-spanning frequency comb based on a prismless, Ti:sapphire laser. It covers in detail the design and construction of the laser system, as well as the electronic stabilization scheme used to control the frequencies of the mode comb. The system developed is …
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Long-wave infrared frequency combs based on quantum cascade lasers
… as trace-chemical sensing, health monitoring, frequency metrology, noninvasive imgaing and infrared countermeasures. The LWIR region (or mid-infrared region), roughly ranging from 2-20 [mu]m, is of particular importance to spectroscopy applications, since many molecular species have their …
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Piezoelectric MEMS for Energy Conversion in Biomedical Devices
… source. The first half of this work introduces a frequency comb-vibrational energy harvester, designed and characterized to function under a broadband and random vibration source. The frequency comb phenomenon is traditionally studied in the optical domain for applications in timing and …
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Terahertz wave-molecule interactions via CMOS chips : from comb gas sensor with absolute specificity to ultra-stable, miniaturized clock
… generate unique rotational spectra. The frequency and absorption intensity of rotational spectral lines are directly linked to the micro-scale molecular structures. They serve as an indicator or "finger-print" of molecules. Thus, a rotational spectrometer with absolute specificity is …
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Terahertz laser frequency combs : devices and applications
… there has been growing interest in chip-scale frequency combs, such as micro-resonator combs and semiconductor mode-locked sources. From the mid-infrared to the terahertz regime, it has been shown that quantum cascade lasers (QCLs) are capable of forming a frequency comb state where dispersed …
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Development of ultra-broadband modulators
… an incoming pulsed optical source into a frequency comb through the use of arrayed waveguide gratings, and employing both phase and amplitude modulation using Mach Zehnder Interferometers, an arbitrary waveform is constructed following frequency channel recombination. Modulation of …
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A Play of Light and Spins: Excitation and Detection of Non-linear Magnetization Dynamics using Light
… is described in detail in Chapter 1. By using a frequency comb to pump the system, a strong enhancement of the weak scattering amplitude of the selected spin wave (SW) modes is observed. Additionally, the pump laser can be focused down to the diffraction limit and scanned along the focal plane to …
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High repetition rate mode-locked erbium-doped fiber lasers with complete electric field control
… 1550 nm wavelengths. To realize these systems, frequency comb sources are needed that are compatible with electric field stabilization techniques, are compatible with integrated arrayed waveguide grating and modulator technology, and have high repetition rates to allow full use of current …
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Broadband Terahertz Signal Generation and Radiation Based on Direct Digital-to-Impulse Radiating Arrays in Silicon
… enables broadband pulse beamforming in which all frequency content is steered simultaneously. This is in contrast with conventional phased-array architectures that have a limited bandwidth, where an RF signal is time-delayed. One of the main challenges of sampling a picosecond pulse in the time …
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Design, construction, and characterization of an ultra-sensitive, high-precision fast ion-beam spectrometer for the study of molecular ions
… on to the next steps, of building a difference frequency generation laser, performing mid-IR spectroscopy, and implementing supersonic cooling. The spectra obtained in the mid-IR will be valuable for applied astronomical and fundamental spectroscopic research. Direct infrared spectroscopy of an …
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