Narrow-bandwidth picosecond pulses by spectral compression of femtosecond pulses in second-order nonlinear crystals

Marangoni, Marco; Brida, Daniele; Quintavalle, M.; Cirmi, Giovanni; Pigozzo, F.M.; Manzoni, Cristian; Baronio, Fabio; Capobianco, Antonio-Daniele; Cerullo, Giulio

doi:10.1364/oe.15.008884

Cited by 71 publications

(60 citation statements)

References 20 publications

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“…A two-stage OPA followed by an optional frequency conversion stage (Light Conversion TOPAS) generates tunable IR-visible pulses, which are then frequency doubled in a 25-mm BBO crystal in order to produce narrow bandwidth pulses in the UV-visible range. SH-SC takes advantage of the large group-delay-mismatch (GDM) between the fundamental and second harmonic (SH) frequencies in the long non-linear crystal [13][14][15][16][17]. Temporal walk-off as the two pulses propagate through the crystal produces a relatively long (few ps) SH pulse with compressed bandwidth relative to that of the fundamental.…”

Section: Methodsmentioning

confidence: 99%

“…At this wavelength, the spectral filter has a transmission efficiency of ~50% with the slit fully open, dropping to ~15% for a slit width of 0.15mm. Narrowing the slit suppresses the spectral wings (left panel), while the corresponding temporal profile evolves from an asymmetric "nose" shape characteristic of the unfiltered spectral compressor [14] to a broader, more symmetric profile (center panel). The right panel of Fig.…”

Section: Methodsmentioning

confidence: 99%

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Spectrally tailored narrowband pulses for femtosecond stimulated Raman spectroscopy in the range 330-750 nm

et al. 2013

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This is the published version of the article, made available with the permission of the publisher. The original published version can be found at the link below. Elles, Christopher G et al. (2013) Abstract: Spectral compression of femtosecond pulses by second harmonic generation in the presence of substantial group velocity dispersion provides a convenient source of narrowband Raman pump pulses for femtosecond stimulated Raman spectroscopy (FSRS). We discuss here a simple and efficient modification that dramatically increases the versatility of the second harmonic spectral compression technique. Adding a spectral filter following second harmonic generation produces narrowband pulses with a superior temporal profile. This simple modification i) increases the Raman gain for a given pulse energy, ii) improves the spectral resolution, iii) suppresses coherent oscillations associated with slowly dephasing vibrations, and iv) extends the useful tunable range to at least 330-750 nm.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Spectrally tailored narrowband pulses for femtosecond stimulated Raman spectroscopy in the range 330-750 nm

et al. 2013

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“…In both pump and Stokes arms of our SRS setup we employ the technique of second harmonic (SH) spectral compression [5] whereby the group delay mismatch of the interacting pulses is selected to shrink the fundamental frequency spectrum into a narrowband SH line (see Fig. 1(c)).…”

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confidence: 99%

Ultrafast-laser-induced backward stimulated Raman scattering for tracing atmospheric gases

Malevich¹,

Kartashov²,

Zou³

et al. 2012

Opt. Express

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Abstract. By combining tunable broadband pulse generation with nonlinear spectral compression, we demonstrate a prototype scheme for highly selective coherent standoff sensing of air molecules and discuss its coupling to the recently demonstrated backward atmospheric lasing.Many applications in environmental science and security call for standoff chemical identification of airborne pollutants by their signature molecular vibrations. Raman LIDARs, relying on the observation of incoherent wide-angle scattering, have limitations in their practicability. The success of heterodyne detection as a cornerstone concept of the existing coherent LIDAR approaches motivate the development of optical remote sensing schemes where the coherence would be used to provide a highly directional backward optical signal through stimulated Raman scattering, thus enhancing the sensitivity and selectivity of standoff detection. Coherently-enhanced Raman scattering processes, such as Coherent Anti-Stokes Raman Scattering (CARS) and Stimulated Raman Scattering (SRS), open the possibility of recording signals carried in a laser-like beam. Generation of a backward phase-matched Raman signal is simple in the presence of reflective or diffuse objects capable of bouncing the laser beam back. However, an observer who sends out a laser pulse to interrogate an optically transparent atmosphere has to find an alternative way of initiating a backward-propagating laser beam and to solve the problem of phase matching. The recent experimental demonstration of a remotely pumped atmospheric backward laser using O 2 (λ=845 nm) [1] or N 2 (λ=337 and 357 nm) [2] has sparked proposals for coherent standoff Raman spectroscopies [3].In this work we experimentally and theoretically investigate a prototype for SRS in air which will be ultimately based on the 337-nm atmospheric N 2 laser (Fig.1a). The interim model (Fig.1b) is based on a solid-state ultrafast laser system from which we derive a narrowband third harmonic Stokes pulse at ~340 nm, imitating the N 2 laser emission, and a synchronized tunable narrowband EPJ Web of Conferences

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confidence: 99%

“…Spectral compression of the broadband femtosecond pulses is achieved by generating narrow-band second harmonic (SH) pulses in crystals with large groupdelay mismatch between the fundamental frequency (FF) and the SH pulses [10,11]. Such a technique was recently demonstrated by our group [11,12]. When applied to CARS in combination with fibre-format sources, it allows a dramatic improvement of the set-up in terms of compactness, simplicity and, most of all, versatility, thanks to the possibility of easily synthesizing a third phase-coherent colour to be applied either for FM-CARS or for I-CARS techniques.…”

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confidence: 99%

Compact fibre-based coherent anti-Stokes Raman scattering spectroscopy and interferometric coherent anti-Stokes Raman scattering from a single femtosecond fibre-laser oscillator

Kumar¹,

Alessio²,

Manzoni³

et al. 2010

Pramana - J Phys

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We demonstrate a new approach to CARS spectroscopy by efficiently synthesizing synchronized narrow-bandwidth (less than 10 cm −1 ) pump and Stokes pulses (frequency difference continuously tunable upto ∼3000 cm −1 ) based on spectral compression together with second harmonic generation (in periodically-poled nonlinear crystals) of femtosecond pulses emitted by a single compact Er-fibre oscillator. For a far better signal to non-resonant background contrast, interferometric CARS (I-CARS) is demonstrated and CARS signal enhancement upto three orders of magnitude is achieved by constructive interference with an auxiliary local oscillator at anti-Stokes field, also synthesized by spectral compression of pulses emitted from the same fibre oscillator.The coherent anti-Stokes Raman scattering (CARS) is a label-free high-sensitivity nonlinear spectroscopy technique that is capable of real-time non-invasive biomedical video-rate imaging based on molecular vibrational spectroscopy offering intrinsic chemical selectivity [1]. The nonlinear nature of the CARS process automatically grants it the capability of three-dimensional sectioning which is essential for imaging thick samples. In CARS process, two temporally and spatially overlapped narrow-band pulses, pump frequency, ω p , and Stokes frequency, ω s , interact with a sample via a wave-fixing process. When beat frequency Ω = ω p − ω s is tuned to Raman-active molecular vibration of the sample molecule, the resonant oscillators within the sample are coherently driven by the excitation fields, thereby generating a strong anti-Stokes signal at ω as = 2ω p − ω s representing a unique chemical signature of the resonant oscillator molecule.CARS spectroscopy requires two synchronized pulse trains with narrow bandwidth (a few cm −1 ; vibrational linewidths are typically of the order of 10-20 cm −1 ) 1129

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Narrow-bandwidth picosecond pulses by spectral compression of femtosecond pulses in second-order nonlinear crystals

Cited by 71 publications

References 20 publications

Spectrally tailored narrowband pulses for femtosecond stimulated Raman spectroscopy in the range 330-750 nm

Spectrally tailored narrowband pulses for femtosecond stimulated Raman spectroscopy in the range 330-750 nm

Ultrafast-laser-induced backward stimulated Raman scattering for tracing atmospheric gases

Compact fibre-based coherent anti-Stokes Raman scattering spectroscopy and interferometric coherent anti-Stokes Raman scattering from a single femtosecond fibre-laser oscillator

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