17,885 research outputs found
Supercontinuum generation and nonlinearity in soft glass fibers
No full textThe optical fiber based supercontinuum source has recently become a significant scientific and commercial success, with applications ranging from frequency comb production to advanced medical imaging. This one-of-a-kind book explains the theory of fiber supercontinuum broadening, describes the diverse operational regimes and indicates principal areas of applications, making it a very important guide for researchers and graduate students. With contributions from major figures and groups who have pioneered research in this field, the book describes the historical development of the subject, provides a background to the associated nonlinear optical processes, treats the generation mechanisms from continuous wave to femtosecond pulse pump regimes and highlights the diverse applications. A full discussion of numerical methods and comprehensive computer code are also provided, enabling readers to confidently predict and model supercontinuum generation characteristics under realistic conditions
Idler-resonant femtosecond optical parametric oscillator with high mid-infra-red beam quality
No full textWe report an idler-resonant femtosecond optical parametric oscillator (OPO) with average output power of 520 mW, repetition-rate of 80 MHz, pulse duration of 90 fs and nearly diffraction-limited beam quality at ~2.4 µm
Modelling pulse compression in BBO using cascaded nonlinearity: the effects of self-steepening in quadratic media
No full textIn a χ(2) material such as BBO, third order nonlinear effects can occur efficiently via a cascaded nonlinearity where light is rapidly converted from the fundamental to the second harmonic and back again with an intensity dependant phase shift. This cascaded nonlinearity has been used to demonstrate a wide range of χ(3) effects such as soliton propagation and compression. Here we study soliton-like pulse compression in a BBO crystal of 100fs input pulses looking to see the minimum pulse duration that can be obtained. Included for the first time in a systematic study is the χ(2) self steepening term[1] which we have found plays a significant role in the pulse dynamics
Nonlinear pulse compression dispersion compensation and soliton propagation in holey fiber at 1 µm
No full textWe fabricated a single mode, polarization maintaining, highly non-linear, 125 micron silica jacketed, holey fiber with anomalous dispersion at 1.06 micron. Nonlinear pulse compression and soliton propagation are demonstrated (1.06 micron, Yb3+ source) with just 1 mW average power
Development and applications of ytterbium-doped highly nonlinear holey optical fibres
No full textWe have fabricated an ytterbium doped holey fibre with an effective area of just 2.5µm2 at the laser wavelength (1.03µm) as shown in Fig.1(a). The fibres display huge birefringence at 1.55µm (beat length 0.3mm) owing to the high index contrast between the core and the cladding, the small dimensions, and the elliptical core shape. Using this fibre, we have demonstrated a low threshold and environmentally stable mode-locked laser using frequency feedback technique (see Fig.1 (b)). Furthermore, the fibre exhibits anomalous dispersion at the laser wavelength. Using this feature along with the high nonlinearity, we have also demonstrated broadly and continuously tunable Raman soliton generation by seeding with only pico-joule femtosecond pulses into the fibre. In a single pulse regime, the tuning range covers from 1.06 to 1.33µm, a region that is difficult to access using conventional solid state laser technology. In a multiple pulse regime, we have obtained femtosecond pulses as long as 1.58µm as shown in Fig.1(c)
A tunable femtosecond pulse source operating in the range 1.06-1.33 microns based on an Yb doped holey fiber amplifier
No full textWe report soliton pulse formation, amplification and soliton-self-frequency-shifting in an anomalously dispersive, Yb-doped holey fiber amplifier. Our fiber based system provides a highly-practical, continuously-tuneable, femtosecond pulse source operational in the important and difficult to access wavelength range from 1.05 to 1.35 microns
A small core Yb<sup>3+</sup>-doped holey fibre laser and amplifier
No full textWe have fabricated an ytterbium doped holey fibre with an effective area of just 2.5µm2 at the laser wavelength (1.03µm). Using this fibre, we have demonstrated a low threshold mode-locked laser using frequency feedback technique. Furthermore, by seeding with pico-joule femtosecond pulses, we obtain Raman solitons tunable from 1.06 to 1.58µm.<br/
Mid-IR coherent supercontinuum generation in all-solid step-index soft glass fibers
No full textWe numerically demonstrate that normal dispersion femtosecond pumping of tailored soft glass step-index fibers can generate highly coherent mid-IR supercontinuum light with two octaves bandwidth, suitable for recompression to few-cycle pulse durations
Tunable, femtosecond pulse source operating in the range 1.06-1.33 micron based on an Yb<sup>3+</sup>-doped holey fiber amplifier
No full textWe report soliton pulse formation and amplification and soliton-self-frequency shifting in an anomalously dispersive, Yb3+ -doped holey fiber amplifier seeded with pulses from an Yb3+ -doped, 1.06 µm fiber based mode-locked oscillator. Our fiber-based system provides a highly practical, all-diode-pumped, continuously tunable femtosecond pulse source operational in the important and difficult to reach wavelength range from 1.06 to 1.33 µm. In other experiments multipulse, multicolored soliton formation was observed with wavelength-shifted pulsed output to beyond 1.58 µm. Supercontinuum generation and nonlinear compression of pulses to 65 fs were also obtained with other configurations
Exploring quantum memory via optically induced Bragg structures
No full textWe investigate short-term light storage for quantum computing by trapping light in an optically induced Bragg grating in warm Rb vapour
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