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Showing 1 to 20 of 28 for “"Frequency combs"”.
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Phononic Frequency Combs
Optical frequency combs have resulted in significant advances in optical frequency metrology and found wide application to precise physical measurements and molecular fingerprinting. A direct analogue of frequency combs in the phononic or acoustic domain has not been reported to date. This thesis …
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Multimode Microresonator Optical Frequency Combs
… of multi-mode microresonator optical frequency combs. Experimentally, we drive a single microresonator with multiple independent lasers to observe the scattering of a probe field from a soliton frequency comb, as well as study the excitation and control of multiple soliton combs in a …
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Quantum Cascade Laser Frequency Combs
… This has made them excellent candidates for frequency combs, which are broadband light sources that emit equally-spaced frequencies with a well-defined phase relation. By manipulating the optical non-linearities through dispersion engineering, QCLs can be made to enter frequency combs states …
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Manipulating atoms and molecules with frequency combs
… possibility of cooling atoms or molecules using frequency combs. Using frequency combs in laser cooling of multilevel systems may eliminate the need for multiple lasersources, which are currently required to pump the population between manifolds of energy states. It is shown that a small amount …
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Development of Broadband Semiconductor Laser Frequency Combs
… in both terahertz (THz) and mid-infrared (midIR) frequency range. Many molecules have rotational-vibrational absorption bands in midIR, making QCL-based dual comb spectroscopy (DCS) systems the ideal tool for field deployable multi-species detection system. Comb bandwidth and power ultimately …
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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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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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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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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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Towards terahertz dual-comb spectroscopy based on quantum cascade lasers
In this thesis, terahertz (THz) laser frequency combs are improved and THz dual-comb spectroscopy method is demonstrated. To achieve better performance of THz quantum cascade laser (QCL) frequency combs, several broadband homogeneous and heterogeneous gain media are characterized, and corresponding …
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Broadband electrooptic modulators based on gallium arsenide materials
… Arbitrary Waveform Generation (OAWG) combines frequency combs and frequency-by- frequency pulse shapers to synthesize optical waveforms. The OAWG technique has a wide variety of applications, ranging from high resolution imaging, Light Detecting and Ranging (LIDAR) systems for high precision …
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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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Broadband terahertz photonics
… sources of light in the terahertz range, the frequency range spanning 1 to 10 THz. Though technological development has pushed their operating temperatures up to 200 Kelvin and their power levels up to Watt-level, they have remained unsuitable for many applications as a result of their narrow …
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Optical frequency division by 3 employing self-phase-locking in periodically poled lithium niobate
… the usable range of octave-spanning optical frequency combs for frequency metrology applications. The divider is based on a self- phase locked optical parametric oscillation in a doubly resonant semi-monolithic optical cavity containing a dual-grating periodically poled lithium niobate. The …
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Integrated waveguide devices for mode-locked lasers
… and as the key enabling technology for optical frequency combs. Integrating such laser systems onto a chip using silicon photonics will dramatically reduce size and cost, thus increasing the accessibility of this technology for widespread deployment. Mode-locked lasers can also serve as master …
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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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High repetition rate fiber and integrated waveguide femtosecond lasers
Femtosecond lasers and the development of frequency combs have revolutionized multiple fields like metrology, spectroscopy, medical diagnostics and optical communications. However, to enable wider adoption of the technology and new applications like photonic sampling, optical arbitrary waveform …
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Fully Integrated CMOS-compatible mode-locked lasers
… applications. Large and complex radio-frequency and optical systems could be potentially replaced with compact, power-ecient, alignment-free, cost-effectively mass-produced integrated photonics components. An on-chip high repetition-rate mode-locked laser is a key enabler of many …
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Using saturated absorption spectroscopy on acetylene-filled hollow-core fibers for absolute frequency measurements
Current portable near-infrared optical frequency references offer modest accuracy and instability compared to laboratory references. Low pressure reference cells are necessary to realize features narrower than the Doppler broadened overtone transitions, and most setups to date have occurred in …
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Femtosecond fiber lasers at 1550 nm for high repetition rates and low timing jitter
… technology for advances in many areas including: frequency combs, precise timing distribution, optical arbitrary waveform generation, and high bit rate sampling for analog to digital conversion. Experiments and applications like these put demanding requirements on the source laser oscillator; such …
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