Sub-5 fs optical pulse characterization

Morita, Ryuji; Hirasawa, Masahiro; Karasawa, Naoki; Kusaka, Satoru; Nakagawa, Naofumi; Yamane, Kunio; Li, Liming; Suguro, Akira; Yamashita, Mikio

doi:10.1088/0957-0233/13/11/307

Cited by 17 publications

(10 citation statements)

References 37 publications

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“…As few-and single-cycle optical pulses have become more common, spectral phase interferometry for direct electric field reconstruction 1 (SPIDER) has emerged as one of the principal methods for determining the electric field of such pulses, 2 with variants specialized for low-power pulses 3 and spatiotemporal characterization, 4 among others. SPIDER applies the technique of Fourier transform spectral interferometry to a pair of frequency sheared pulses.…”

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confidence: 99%

Two-dimensional spectral shearing interferometry for few-cycle pulse characterization

2006

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We present a new method for measuring the spectral phase of ultrashort pulses that utilizes spectral shearing interferometry with zero delay. Unlike conventional spectral phase interferometry for direct electric-field reconstruction, which encodes phase as a sensitively calibrated fringe in the spectral domain, two-dimensional spectral shearing interferometry robustly encodes phase along a second dimension. This greatly reduces demands on the spectrometer and allows for complex phase spectra to be measured over extremely large bandwidths, potentially exceeding 1.5 octaves.

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Two-dimensional spectral shearing interferometry for few-cycle pulse characterization

2006

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“…Moreover, the intensity of the SPIDER interferogram is strong enough to characterize the spectral phase of the PCF output pulse over the entire spectral region. The minimum detectable average power is about 5 mW (60 pJ/pulse) [6]- [8]. The value of the spectral shear was measured to be 8.24 THz.…”

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confidence: 95%

“…1]) and a modified spectral-phase interferometer for direct electric-field reconstruction (M-SPIDER) apparatus with a high sensitivity [6]- [8], and a fringe-resolved autocorrelator. The employed feedback system is based on a previously reported apparatus [5].…”

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Pulse Compression Using Direct Feedback of the Spectral Phase From Photonic Crystal Fiber Output Without the Need for the Taylor Expansion Method

Adachi

Yamane²,

Morita³

et al. 2004

IEEE Photon. Technol. Lett.

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Abstract-Characterization and compensation of the complex spectral phase and the temporal profile of output pulses from a photonic crystal fiber (620-945-nm spectral broadening) were performed using a computer-controlled feedback system that combines a modified spectral-phase interferometry for direct electric-field reconstruction apparatus and only a 4-chirp compensator having a spatial light modulator. These pulses were adaptively compressed from 12-fs input pulses to 6.8-fs. In addition, the compressed pulse profile showed excellent agreement with results measured independently with fringe-resolved autocorrelation.Index Terms-Chirp compensation, optical pulse compression, photonic crystal fiber (PCF).T HE PHOTONIC crystal silica fiber (PCF) has attracted much attention because of its unusual dispersion profile and hence the efficient generation of ultrabroad-band pulses [1]- [2]. Since the first experimental demonstration of the efficient spectral broadening using the fiber [1], [2], a variety of applications such as pulse compression, ultrabroad-band and frequency-conversion optical sources for spectroscopy and biomedicine, optical frequency metrology, and telecommunication technologies have been pointed out. Among them, it is expected that further pulse compression of ultrashort laser pulses without any amplification opens the way for monocycle fiber optics.Very recently (2003), pulse compression using the PCF was attempted by a passive chirp compensator consisting of the combination of a prism pair and a chirped mirror [3]. The experiment was done using the conventional measurement of only the group-delay dispersion (GDD) of the fiber output (700-810-nm spectral broadening) by a spectral gating method with sum frequency generation. The compressed pulse duration was estimated to be 25 fs by fringe-resolved autocorrelation (FRAC) which contained relatively large wings under the assumption of a pulse shape. This imperfect pulse compression far from the 18-fs transform limited pulse was the result of the following problems: 1) the bandwidth limitation and the inter-relation between the GDD and third-order phase dispersion of the employed chirp compensator; 2) insufficient information on the complicated spectral phase of the output from PCF where several nonlinear phenomena occur simultaneously, such as self-phase modulation, parametric four-wave mixing, stimulated Raman scattering, soliton formation and self-steepening, as well as unusual dispersion profile [4]; 3) nonexact measurement of the temporal intensity profile of the compressed pulse; and 4) the relatively low peak power of the output pulse from the PCF, which is due to the ultrabroadening of its spectrum and the limitation of the fiber-input power available directly from a Ti : sapphire laser.The purpose of this letter is to experimentally demonstrate that a technique based on direct feedback of the spectral phase without Taylor expansion enables us to perfectly compress the much broader band pulses from the PCF and to overcome the above-mentioned pr...

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“…We developed a modified SPIDER (M-SPIDER) technique that greatly improved its sensitivity. 6,7 It is diff icult to compress broadband optical pulses with an over-one-octave bandwidth by use of conventional passive chirped compensators such as prism and (or) grating combinations, chirped mirrors, because of their bandwidth limitation and high-order dispersion. A liquid-crystal spatial light modulator (SLM) is a superior candidate for a programmable phase compensator of over-one-octave pulses.…”

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confidence: 99%

“…Next we examined the error source in the previous system 6,7 and made some important modifications as described below. First, we improved the beam splitters in the Michelson interferometer.…”

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confidence: 99%

Optical pulse compression to 34fs in the monocycle region by feedback phase compensation

et al. 2003

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We compensated for chirp of optical pulses with an over-one-octave bandwidth (495 -1090 nm; center wavelength of 655.4 nm) produced by self-phase modulation in a single argon-filled hollow fiber and generated 3.4-fs, 1.56 optical-cycle pulses (500 nJ, 1-kHz repetition rate). This was achieved with a feedback system combined with only one 4-f phase compensator with a spatial light modulator and a significantly improved phase characterizer based on modified spectral phase interferometry for direct electric-field reconstruction. To the best of our knowledge, this is the shortest pulse in the visible-to-infrared region.

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Sub-5 fs optical pulse characterization

Cited by 17 publications

References 37 publications

Two-dimensional spectral shearing interferometry for few-cycle pulse characterization

Two-dimensional spectral shearing interferometry for few-cycle pulse characterization

Pulse Compression Using Direct Feedback of the Spectral Phase From Photonic Crystal Fiber Output Without the Need for the Taylor Expansion Method

Optical pulse compression to 34fs in the monocycle region by feedback phase compensation

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