Generation of 8-fs pulses at 390 nm

Fürbach, A.; Le, Tuan; Spielmann, Christian; Krausz, Ferenc

doi:10.1007/s003400000288

Cited by 18 publications

(12 citation statements)

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“…The origin of the rapidly varying spectral features is not fully understood but is not necessarily the QPM nature of the device, since a similar behavior was observed with birefringent phase matching. 3 We observed no indications of two-photon absorption or self-phase-modulation in the CPPLT.…”

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confidence: 52%

“…2) and 8 fs (Ref. 3) were generated by doubling of ϳ10-fs pulses from a Ti:sapphire oscillator by use of birefringent phase matching. In the latter experiment, focusing the FH tighter than confocally into a 100-mm-thick BBO crystal reduced the effective interaction length and alleviated SH pulse broadening owing to GVM.…”

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confidence: 99%

“…80 mW of SH light was generated, with 950-mW FH power and an efficiency of 0.7%͞nJ. 3 In this Letter we describe an alternative approach to frequency doubling of sub-10-fs pulses that relies on the engineerability of quasi-phase-matching (QPM) gratings and does not suffer from crystal-length and focusing limitations. We demonstrate scalability to shorter pulse lengths by generating sub-6-fs blue pulses.…”

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confidence: 99%

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Generation of sub-6-fs blue pulses by frequency doubling with quasi-phase-matching gratings

Gallmann¹,

Steinmeyer²,

Keller³

et al. 2001

Opt. Lett.

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We demonstrate the generation of sub-6-fs pulses centered at 405 nm by frequency doubling of 8.6-fs Ti:sapphire laser pulses. The frequency doubling is carried out in a nonlinearly chirped quasi-phase-matching grating fabricated in a lithium tantalate substrate. This device simultaneously provides frequency conversion and pulse compression of the positively prechirped fundamental pulses. The second-harmonic pulses are characterized in a cross-correlation setup, and their pulse shapes are retrieved by two iterative phase-reconstruction algorithms. The generated second-harmonic spectrum spans a bandwidth of 220 THz. To our knowledge, these are the shortest pulses ever generated in the blue spectral region.

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Generation of sub-6-fs blue pulses by frequency doubling with quasi-phase-matching gratings

Gallmann¹,

Steinmeyer²,

Keller³

et al. 2001

Opt. Lett.

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“…The nearly transform-limited pulse is then focused onto a 100-µm thick BBO crystal with a spherical mirror (f = 12mm) as discussed by Furbach et al, providing SH light with approximately 3 mW average power and a large spectral bandwidth (Figure 2d). 8 The probe beam is then directed to a second home-built pulse shaping setup using a SLM (Boulder Nonlinear Systems) in order to compensate for the dispersion of the microscope objective. Work to optimize the chirp of the probe beam is ongoing.…”

Section: Imaging Systemsmentioning

confidence: 99%

Chemical-contrast imaging with pulse-shaping based pump-probe spectroscopy

2013

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Ultrafast pump-probe spectroscopy and pulse-shaping techniques are providing new modes of contrast for the field of multiphoton microscopy. Endogenous species such as heme proteins show rich nonlinear spectroscopic signatures of excited state absorption, stimulated emission and ground-state bleaching. Commercially available octave-spanning Ti:sapphire oscillators offer new opportunities for imaging based on pump-probe contrast. Spatial light modulators take advantage of this large bandwidth, shaping pulses of light to selectively excite molecular structures with similar spectral properties. We present two-color pump-probe imaging of heme proteins solutions and red blood cells.

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“…For example, Furbach et al directly upconverted a high-power Ti:Sapph oscillator in a bulk doubling crystal [17]. Their model, based on standard plane-wave interactions, could not explain the rapid structure of their spectrum or its bandwidth.…”

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confidence: 99%