Induced spectral broadening of a weak picosecond pulse in glass produced by an intense picosecond pulse

Alfano, R. R.; Li, Q. X.; Jimbo, T.; Manassah, Jamal T.; Ho, P. P.

doi:10.1364/ol.11.000626

Cited by 106 publications

(32 citation statements)

References 6 publications

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“…Sometimes both of second harmonic generation SHG and SPM occur simultaneously and can be coupled together thus the interference between them alters the emission spectrum that is called second harmonic generation cross-phase modulation (SHG-XPM) (Alfano et al, 1987). When a weak pulse at a different frequency propagates through a disrupted medium whose index of refraction is changed by an intense laser pulse according to another nonlinear process called induced phase modulation (IPM) at which the phase of the weak optical field can be modulated by the time variation of the index of refraction originating from the primary intense pulse (Alfano et al, 1986). Recent development of ultra-short femtosecond lasers has opened the way to the investigation of ultrafast processes in many fields of science.…”

Section: Supercontinuum Generation and Ultrashort Pulsesmentioning

confidence: 99%

Generation of Few Cycle Femtosecond Pulses via Supercontinuum in a Gas-Filled Hollow-Core Fiber

Tawfik¹,

An²,

Kim³

2012

Selected Topics on Optical Fiber Technology

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Section: Supercontinuum Generation and Ultrashort Pulsesmentioning

confidence: 99%

Generation of Few Cycle Femtosecond Pulses via Supercontinuum in a Gas-Filled Hollow-Core Fiber

Tawfik¹,

An²,

Kim³

2012

Selected Topics on Optical Fiber Technology

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“…White-light generation via the self-phase modulation has been reported for the first time by Alfano et al [16] who have obtained spectral broadening for the picosecond Nd:YAG laser pulses (532 nm and 5 mJ) passing through a borosilicate glass. Actually, it is a real challenge to employ the effective dispersion compensation and return an isolated ultrashort optical pulse using the supercontinuum generation [17].…”

Section: Introductionmentioning

confidence: 97%

High-power table-top white-light few-cycle laser generator

Tawfik¹

2015

Ukr. J. Phys. Opt.

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Abstract.We have achieved experimentally a generation of white-light few-cycle femtosecond laser pulses, using a neon-filled hollow-core fibre. The pulses observed by us are as short as 6.22 fs at the repetition rate of 1 kHz, when the input is characterized by the parameters 2.5 mJ and 33 fs. Pulse compression has been achieved using a supercontinuum produced in a static neon-filled hollow fibre, while a pair of chirped mirrors have compensated the dispersion. Our technique allows for directly tuning the pulse duration via changing the gas pressure, while maintaining near-transform-limited pulses with constant output energies and thus reducing the complications introduced by the chirped pulses. Using the measurements of the optical transmission of the fibre as a function of the gas pressure, we have testified a high enough throughput exceeding 60%. This demonstrates the successful compression that yields few-cycle femtosecond-long pulses, with a wide spectral bandwidth. The technique can be used when simultaneously exciting different states in complex molecules.

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“…The WLC can be generated by focusing high energetic short pulses into a transparent medium such as water [22], glass [31], optical fiber [32], photonic crystals [33], dielectric and semiconductors [34], crystals such as BaF 2 [35] and inert gases such Krypton or Ar [36,37]. We produced WLC by slightly focusing femtosecond pulses into a hollow fiber filled with Ar gas.…”

Section: Introductionmentioning

confidence: 99%

Dispersive white light continuum single Z-scan for rapid determination of degenerate two-photon absorption spectra

et al. 2018

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We present an experimental technique to determine the degenerate two-photon absorption (2PA) spectra by performing a single Z-scan using a high-spectral-irradiance white light continuum (WLC) generated by a hollow core fiber. The hollow fiber was filled with Argon (Ar) gas at a pressure of 0.6 bar and was pumped with 500 mJ, 30 fs, and 800 nm pulses. The broadband WLC pulses with 350 nm bandwidth in the range of 600-950 nm were compressed to sub-8 fs pulses. To characterize and interpret the data obtained from this method, the spectral, temporal and spatial characteristics of the WLC were first analyzed. The WLC emerging from the compressor was dispersed using a prism pair and then focused into the sample by a cylindrical lens. Since different spectral components are spatially separated, any part of the sample in the beam cross section is irradiated with almost single wavelength pulses leading to only a degenerate 2PA process. The nonlinear transmittance was then measured by a charge-coupled-device (CCD) line camera as a function of the sample position while the sample was moved along the beam direction by a motorized translation stage. In this way the Z-scans at different wavelengths in the WLC spectral range can be measured and thus the wavelength-resolved degenerate 2PA spectra can be obtained by performing a single scan using dispersive WLC. This method was verified on a well-characterized dye Rhodamine B and yield a reasonable agreement with the data found in the literature. We used this method to determine the 2PA spectra of some two-photon initiators (2PIs) developed for two-photon polymerization (2PP) based 3D micro-structuring.

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Induced spectral broadening of a weak picosecond pulse in glass produced by an intense picosecond pulse

Cited by 106 publications

References 6 publications

Generation of Few Cycle Femtosecond Pulses via Supercontinuum in a Gas-Filled Hollow-Core Fiber

Generation of Few Cycle Femtosecond Pulses via Supercontinuum in a Gas-Filled Hollow-Core Fiber

High-power table-top white-light few-cycle laser generator

Dispersive white light continuum single Z-scan for rapid determination of degenerate two-photon absorption spectra

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