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Author: Venkata Ramaiah Badarla
Publisher:
ISBN:
Category :
Languages : en
Pages : 125
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In this thesis, we have demonstrated various ultrafast optical parametric oscillators (OPOs) based on different nonlinear media. The thesis consists of OPO systems, novel techniques, designs, and concepts that has facilitated the wavelength accessibility from 1 μm in the near-infrared region to as far as 8 μm in the mid-infrared region. We developed a fs OPO based on BiB3O6 (BIBO) directly pumped the Kerr-lens mode-locked (KLM) Ti:sapphire laser. This system could provide broad and rapid tuning from 1420-1560 nm just by changing the cavity length. Also, by exploiting the unique optical properties of BIBO under type I (e¿oo) interaction, we have demonstrated the first self-phase-locked degenerate fs OPO. Further, we have developed a technique called synchronous retro-reflection for threshold reduction and signal amplification before the onset of the oscillation. This technique is generic and is particularly useful while deploying ultrafast OPOs with birefringent materials that have relatively low nonlinear gain and when we have limited pump power. In addition, we have developed a dual-wavelength fs OPO with arbitrary and independent tuning by making use of anti-resonant-ring (ARR) or Sagnac interferometer. This universal technique of coupling two optical oscillators can be employed in any time regime (cw to ultrafast pico or fs) irrespective of the operating wavelengths. This conceptual technique can be used for intracavity terahertz (THz) generation which exploits the high intensity intracavity oscillating pulses. Also, we have developed a dual-crystal, double-pumped OPOs for intracavity signal amplification in fs regime as well as in ps regime, for arbitrary and independent wavelength tuning. In both systems two crystals share the same optical cavity but are pumped independently by a single laser source. Finally, we have devised and experimentally demonstrated a novel concept of pumping an OPO within another OPO using a composite cascaded cavity design. This all solid-state Ti:sapphire-pumped fs OPO system is potentially capable of providing access to mid-infrared region beyond 4 μm to as far as 18 μm by careful selection of the nonlinear medium.
Author: Venkata Ramaiah Badarla
Publisher:
ISBN:
Category :
Languages : en
Pages : 125
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Book Description
In this thesis, we have demonstrated various ultrafast optical parametric oscillators (OPOs) based on different nonlinear media. The thesis consists of OPO systems, novel techniques, designs, and concepts that has facilitated the wavelength accessibility from 1 μm in the near-infrared region to as far as 8 μm in the mid-infrared region. We developed a fs OPO based on BiB3O6 (BIBO) directly pumped the Kerr-lens mode-locked (KLM) Ti:sapphire laser. This system could provide broad and rapid tuning from 1420-1560 nm just by changing the cavity length. Also, by exploiting the unique optical properties of BIBO under type I (e¿oo) interaction, we have demonstrated the first self-phase-locked degenerate fs OPO. Further, we have developed a technique called synchronous retro-reflection for threshold reduction and signal amplification before the onset of the oscillation. This technique is generic and is particularly useful while deploying ultrafast OPOs with birefringent materials that have relatively low nonlinear gain and when we have limited pump power. In addition, we have developed a dual-wavelength fs OPO with arbitrary and independent tuning by making use of anti-resonant-ring (ARR) or Sagnac interferometer. This universal technique of coupling two optical oscillators can be employed in any time regime (cw to ultrafast pico or fs) irrespective of the operating wavelengths. This conceptual technique can be used for intracavity terahertz (THz) generation which exploits the high intensity intracavity oscillating pulses. Also, we have developed a dual-crystal, double-pumped OPOs for intracavity signal amplification in fs regime as well as in ps regime, for arbitrary and independent wavelength tuning. In both systems two crystals share the same optical cavity but are pumped independently by a single laser source. Finally, we have devised and experimentally demonstrated a novel concept of pumping an OPO within another OPO using a composite cascaded cavity design. This all solid-state Ti:sapphire-pumped fs OPO system is potentially capable of providing access to mid-infrared region beyond 4 μm to as far as 18 μm by careful selection of the nonlinear medium.
Author: Tobias Paul Lamour
Publisher:
ISBN:
Category :
Languages : en
Pages :
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A source-demand in the near- and mid-IR wavelength spectrum exists for various applications such as waveguide inscription, multiphoton imaging, and nonlinear spectroscopy. All of the applications seek for higher repetitions rates for faster processing speed, better signal to noise ratios or to improve the results for applications like laser waveguide inscription. This is in contrast to the high pulse energies, required to drive the nonlinear processes involved with these applications. Available systems are either based on low-energy, high-repetition-rate optical parametric oscillators or high-energy, low-repetition-rate optical parametric amplifiers. In this thesis a sources was developed that can bridge the wide gap between these two extremes, providing sufficient energy to drive nonlinear processes, with repetition rates in the MHz domain. This was achieved by introducing three techniques previously employed for energy scaling in laser cavities. Firstly an exchange from the conventionally used Ti:sapphire pump to a commercial high power Yb:fibre laser system readily scaled the usable pump energy. This was combined with a technique known as cavity-length extension, which allows a lowering of the cavity roundtrip time offering the build-up of pulses with increased energy. In a final stage, cavity-dumping on basis of an acousto-optic modulator was introduced into the a redesigned cavity. The combination of these three techniques, novel to synchronously pumped optical parametric oscillators, enabled the extraction of record-high pulse energies and peak powers.
Author: Florian Kienle
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Peter Hannaford
Publisher: Springer Science & Business Media
ISBN: 038723294X
Category : Science
Languages : en
Pages : 350
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Book Description
The embryonic development of femtoscience stems from advances made in the generation of ultrashort laser pulses. Beginning with mode-locking of glass lasers in the 1960s, the development of dye lasers brought the pulse width down from picoseconds to femtoseconds. The breakthrough in solid state laser pulse generation provided the current reliable table-top laser systems capable of average power of about 1 watt, and peak power density of easily watts per square centimeter, with pulse widths in the range of four to eight femtoseconds. Pulses with peak power density reaching watts per square centimeter have been achieved in laboratory settings and, more recently, pulses of sub-femtosecond duration have been successfully generated. As concepts and methodologies have evolved over the past two decades, the realm of ultrafast science has become vast and exciting and has impacted many areas of chemistry, biology and physics, and other fields such as materials science, electrical engineering, and optical communication. In molecular science the explosive growth of this research is for fundamental reasons. In femtochemistry and femtobiology chemical bonds form and break on the femtosecond time scale, and on this scale of time we can freeze the transition states at configurations never before seen. Even for n- reactive physical changes one is observing the most elementary of molecular processes. On a time scale shorter than the vibrational and rotational periods the ensemble behaves coherently as a single-molecule trajectory.
Author: Cameron Francis Rae
Publisher:
ISBN:
Category :
Languages : en
Pages : 277
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Author: Jun Ye
Publisher: Springer Science & Business Media
ISBN: 0387237917
Category : Science
Languages : en
Pages : 373
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Over the last few years, there has been a convergence between the fields of ultrafast science, nonlinear optics, optical frequency metrology, and precision laser spectroscopy. These fields have been developing largely independently since the birth of the laser, reaching remarkable levels of performance. On the ultrafast frontier, pulses of only a few cycles long have been produced, while in optical spectroscopy, the precision and resolution have reached one part in Although these two achievements appear to be completely disconnected, advances in nonlinear optics provided the essential link between them. The resulting convergence has enabled unprecedented advances in the control of the electric field of the pulses produced by femtosecond mode-locked lasers. The corresponding spectrum consists of a comb of sharp spectral lines with well-defined frequencies. These new techniques and capabilities are generally known as “femtosecond comb technology. ” They have had dramatic impact on the diverse fields of precision measurement and extreme nonlinear optical physics. The historical background for these developments is provided in the Foreword by two of the pioneers of laser spectroscopy, John Hall and Theodor Hänsch. Indeed the developments described in this book were foreshadowed by Hänsch’s early work in the 1970s when he used picosecond pulses to demonstrate the connection between the time and frequency domains in laser spectroscopy. This work complemented the advances in precision laser stabilization developed by Hall.
Author: Stanford University. Microwave Laboratory
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Author: Nathalie Nagl
Publisher: Springer Nature
ISBN: 3030897540
Category : Science
Languages : en
Pages : 155
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This thesis presents the first successful realization of a compact, low-noise, and few-cycle light source in the mid-infrared wavelength region. By developing the technology of pumping femtosecond chromium-doped II-VI laser oscillators directly with the emission of broad-stripe single-emitter laser diodes, coherent light was generated with exceptionally low amplitude noise — crucial for numerous applications including spectroscopy at high sensitivities. Other key parameters of the oscillator's output, such as pulse duration and output power, matched and even surpassed previous state-of-the-art systems. As a demonstration of its unique capabilities, the oscillator's powerful output was used to drive — without further amplification — the nonlinear generation of coherent mid-infrared light spanning multiple octaves. The resulting table-top system uniquely combines high brilliance and ultrabroad spectral bandwidth in the important mid-infrared spectral range. The rapid development of this technology is comprehensively and lucidly documented in this PhD thesis. Together with a thorough review of literature and applications, and an extensive analysis of the theoretical foundations behind ultrafast laser oscillators, the thesis will serve as a valuable reference for the construction of a new generation of mid-infrared light sources.
Author: Kent Charles Burr
Publisher:
ISBN:
Category : Optoelectronic devices
Languages : en
Pages : 360
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Author: Md Ershad Ali
Publisher:
ISBN:
Category :
Languages : en
Pages : 340
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