Wavelength scaling of optimal hollow-core fiber compressors in the single-cycle limit (original) (raw)
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IEEE Photonics Technology Letters, 2000
We present the all-fiber system for amplification of high peak power femtosecond pulses. The 260-fs pulses are generated in the passively mode-locked Er-doped fiber (EDF) laser and amplified using the EDF amplifier system. The average and peak powers of the generated pulses are 215 mW and 43.2 kW, respectively, and the pulsewidth is 42.3 fs. Then the amplified pulses are coupled into polarization-maintaining highly nonlinear dispersion-shifted fiber and octave-spanning supercontinuum is generated. The spectral range is widely expanded from 980 to 2570 nm. To the best of our knowledge, this bandwidth is the maximum one in this wavelength region.
Generation of 3.8-fs pulses from adaptive compression of a cascaded hollow fiber supercontinuum
Optics Letters, 2003
We demonstrate generation of 3.8-fs pulses with energies of up to 15 mJ from a supercontinuum produced in two cascaded hollow fibers. Ultrabroadband dispersion compensation was achieved through a closed-loop combination of a spatial light modulator for adaptive pulse compression and spectral-phase interferometry for direct electric-field reconstruction (SPIDER) measurements as feedback signal.
Universal route to optimal few- to single-cycle pulse generation in hollow-core fiber compressors
Scientific Reports, 2018
Gas-filled hollow-core fiber (HCF) pulse post-compressors generating few- to single-cycle pulses are a key enabling tool for attosecond science and ultrafast spectroscopy. Achieving optimum performance in this regime can be extremely challenging due to the ultra-broad bandwidth of the pulses and the need of an adequate temporal diagnostic. These difficulties have hindered the full exploitation of HCF post-compressors, namely the generation of stable and high-quality near-Fourier-transform-limited pulses. Here we show that, independently of conditions such as the type of gas or the laser system used, there is a universal route to obtain the shortest stable output pulse down to the single-cycle regime. Numerical simulations and experimental measurements performed with the dispersion-scan technique reveal that, in quite general conditions, post-compressed pulses exhibit a residual third-order dispersion intrinsic to optimum nonlinear propagation within the fiber, in agreement with meas...
A novel procedure to produce transform-limited optical pulses with high peak power using supercontinuum generation in an optical fiber has been developed. These pulses have been created using a mode-locked Ti:Sapphire oscillator to generate 18 fs pulses at 795.3 nm with energy of 4 nJ and bandwidth of 46 nm. A high power chirped pulse amplification was used to produce femtosecond pulses of 2.6 W at 32 fs for wavelength 800 nm. To achieve extreme pulse compression in the few-cycle regime, the 32 fs pulses have been injected through a hollow-fiber filled with neon gas to generate supercontinuum pulses then temporally compressor by multilayer-chirped mirrors. This arrangement enabled the generation of a five-octave-wide supercontinuum ultrafast pulses over a wide frequency range from 500 THz to 333 THz. That broad bandwidth has allowed to produce transform limited pulses of 6.01 fs time duration and 120 GW peak power that exceeds the previously observed value of 80 GW for similar pulses. The observed results may give an opportunity to generate ultrashort pulses with extreme short optical wavelength using high harmonic generation that are needed for ultrafast spectroscopy in femtochemistry.
Supercontinuum generation by nanosecond dual-wavelength pumping in microstructured optical fibers
Optics Express, 2006
We study experimentally the spectral evolution of supercontinua in two different microstructured fibers that are pumped with nanosecond pulses from dual-wavelength sources of either 1064/532 nm or 946/473 nm output. The experimental findings are compared with simulations based on numerically solving the nonlinear Schrödinger equation. The role of cascaded cross-phase modulation processes and the group-delay properties of the fiber are emphasized and demonstrated to determine the extent of the broadening of the continua to the visible wavelengths.
Applied Physics B, 2013
We have post-compressed 25 fs (Fourier limit) amplified pulses in an argon-filled hollow-core fiber. The output pulses were compressed using a pair of wedges and chirped mirrors down to 4.5 fs (Fourier limit of 4.1 fs), which corresponds to less than two optical cycles. We then performed the characterization of the pulses by combining the d-scan and the STARFISH techniques. The temporal (and spectral) measurement of the pulses is done with d-scan, which is used as the reference to extend the characterization to the spatiotemporal (and spatiospectral) amplitude and phase of the pulses by means of STARFISH. The post-compressed pulses at the output of the hollowfiber had an energy of 150 lJ. The analysis of the pulses revealed larger spectral broadening and blue-shift, and shorter duration at the center of the beam. For the first time, we demonstrate the complete characterization of intense ultra-broadband pulses in the sub-two-cycle regime, which provides an improved insight into the properties (space-time and space-frequency) of the pulses and is highly relevant for their applications.
Applied Physics B, 2009
Numerical simulations are used to study how fiber supercontinuum generation seeded by picosecond pulses can be actively controlled through the use of input pulse modulation. By carrying out multiple simulations in the presence of noise, we show how tailored supercontinuum Spectra with increased bandwidth and improved stability can be generated using an input envelope modulation of appropriate frequency and depth. The results are discussed in terms of the non-linear propagation dynamics and pump depletion. PACS: 42.65.-k; 42.81.Dp
In this work, new optimization conditions to increasing the optical throughput of neon-filled hollow-core fiber for very broad optical bandwidth and reach extremely-short laser pulses are represented. In the used method, seed pulses from a Ti:sapphire mode locked laser of 18 fs pulses with energy 5 nJ/pulse were injected into a chirped pulse amplifier (CPA) to reach 2.6 mJ per pulse. By controlling the CPA compressor, the output pulses were tuned from 32 – 56 fs. These pulses were used to generate supercontinuum spectra through nonlinear interaction with neon gas filled hollow-fiber by self-phase modulation. The generated output pulses from the fiber were compressed using chirped mirrors to perform dispersion compensation. The observed results reveal that, the output of the fiber can be tuned from about 12 to 94 THz by varying the chirping of input pulses at different pressure of the neon gas. Under optimum conditions of broadband-width at 94 THz, the generated pulses reached the shortest possible time duration of 4.86 fs. The observed results can give an opportunity to control the progression of strong-electric-field interactions on the ultrafast time scale and can be applied to regenerate attosecond pulses in the deep ultraviolet range.
Physical Review Applied, 2019
We demonstrate, numerically, the generation of supercontinuum using a high-power ultrafast source at 1.06-μm wavelength and a nonlinear hollow-core fiber. We yield a system that is less sensitive to noise by pumping in the normal-dispersion regime, yet still achieves enhanced spectral broadening by exciting an optical soliton in the midinfrared region. The pump pulse goes through a series of nonlinear effects leading to a supercontinuum output that spans across the midinfrared, 0.5-4.2 μm.
Efficient generation of CW supercontinuum in optical fiber pumped by ASE light
2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference, 2006
We propose a new and efficient approach to generation of a continuous-wave supercontinuum in optical fiber pumped by an amplified spontaneous emission light. A bandwidth of 268nm (at -15dB level) with an average spectral density of 2.7mw/nm is demonstrated.