P. Laporta
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View article: High-energy soliton frequency shifting in a nitrogen-filled multipass cell
High-energy soliton frequency shifting in a nitrogen-filled multipass cell Open
We report an experimental demonstration of soliton self-frequency shift in a nitrogen-filled multipass cell. The use of a molecular gas combined with the flexible geometry of the multipass platform enables efficient wavelength conversion f…
View article: Mid-infrared ultrafast soliton molecules from a few-cycle Cr:ZnS laser
Mid-infrared ultrafast soliton molecules from a few-cycle Cr:ZnS laser Open
Soliton molecules, or soliton bound states, are envisioned to make far-reaching changes in both fundamental research and applications. Here, we report on the generation and precision manipulation of soliton molecules based on a Kerr-lens m…
View article: SESAM Q-switched Dy-doped fluoride fiber laser at 3.1 µm
SESAM Q-switched Dy-doped fluoride fiber laser at 3.1 µm Open
We report on a passive Q-switching laser operation of an in-band pumped Dy-doped zirconium fluoride fiber using a commercially available semiconductor saturable absorber mirror (SESAM). Stable Q-switching pulse trains with minimum pulse du…
View article: Carrier-envelope offset frequency measurement by means of an external optical resonator
Carrier-envelope offset frequency measurement by means of an external optical resonator Open
A general-purpose method based on the implementation of the asymmetric Pound–Drever–Hall (PDH) technique is proposed to measure the carrier-envelope offset (CEO) frequency of a mode-locked laser using an external optical cavity. By analyzi…
View article: High-resolution mid-infrared spectroscopy based on ultrafast Cr:ZnSe laser
High-resolution mid-infrared spectroscopy based on ultrafast Cr:ZnSe laser Open
High-resolution broadband direct frequency comb spectroscopy in the mid-infrared spectral region is an extremely powerful and versatile experimental technique that allows study of the molecular structure of gaseous compounds with multiple …
View article: Standoff detection of bacterial spores by field deployable coherent Raman spectroscopy
Standoff detection of bacterial spores by field deployable coherent Raman spectroscopy Open
Vibrational spectroscopies offer great potential for standoff detection of chemical and biological warfare agents, avoiding contamination to the operator and equipment. Among them, particularly promising is Coherent anti-Stokes Raman scatt…
View article: Standoff detection of bacterial spores by field deployable coherent Raman spectroscopy.
Standoff detection of bacterial spores by field deployable coherent Raman spectroscopy. Open
Vibrational spectroscopies offer great potential for standoff detection of chemical and biological warfare agents, avoiding contamination to the operator and equipment. Among them, particularly promising is Coherent anti-Stokes Raman scatt…
View article: Passive Q-switched Dy:ZBLAN fibre laser at 3.1 µm
Passive Q-switched Dy:ZBLAN fibre laser at 3.1 µm Open
The passive Q-switching performance of an in-band pumped Dy-doped fluorozirconate fibre laser emitting around 3.1 µm is investigated. Passively Q-switched laser operation is demonstrated employing semi-conductor saturable absorber mirrors.…
View article: Ultrafast Plasmonics Beyond the Perturbative Regime: Breaking the Electronic-Optical Dynamics Correspondence
Ultrafast Plasmonics Beyond the Perturbative Regime: Breaking the Electronic-Optical Dynamics Correspondence Open
The transient optical response of plasmonic nanostructures has recently been the focus of extensive research. Accurate prediction of the ultrafast dynamics following excitation of hot electrons by ultrashort laser pulses is of major releva…
View article: Single-Frequency Dy:ZBLAN Fiber Laser Tunable in the Wavelength Range From 2.925 to 3.250 $\mu$m
Single-Frequency Dy:ZBLAN Fiber Laser Tunable in the Wavelength Range From 2.925 to 3.250 $\mu$m Open
We report on an in-band-pumped Dy-doped ZBLAN fiber laser with tunable emission wavelength in the mid-IR range from 2.925 to 3.250 um and single-frequency operation. Using the combination of an intracavity germanium etalon and a reflective…
View article: Ultrafast, All Optically Reconfigurable, Nonlinear Nanoantenna
Ultrafast, All Optically Reconfigurable, Nonlinear Nanoantenna Open
The enhancement of nonlinear optical effects via nanoscale engineering is a hot topic of research. Optical nanoantennas increase light-matter interaction and provide, simultaneously, a high throughput of the generated harmonics in the scat…
View article: VIBRATIONAL BENDING MODES METROLOGY IN THE 670-720 <span class="roman">cm</span><sup>&#8722;1</sup>RANGE
VIBRATIONAL BENDING MODES METROLOGY IN THE 670-720 <span>cm</span><sup>−1</sup>RANGE Open
We introduce a comb-referenced optical spectrometer operating in the long-wavelength (LW) part of the mid-infrared (MIR) region. It is based on an innovative laser source based on difference frequency generation between two MIR lasers, nam…
View article: Low-noise Yb:CALGO optical frequency comb
Low-noise Yb:CALGO optical frequency comb Open
We report on a compact optical frequency comb, operating in the wavelength range from 670 to 1500 nm, based on diode-pumped low-noise femtosecond Yb:CALGO amplified laser system. Both the carrier-envelope offset and repetition rate are pha…
View article: Realization and characterization of a low intensity noise ultrafast Yb-doped fiber amplifier
Realization and characterization of a low intensity noise ultrafast Yb-doped fiber amplifier Open
We report on the design and whole characterization of low-noise and affordable-cost Yb-doped double-clad fiber amplifiers operating at room temperature in the near-infrared spectral region at pulse repetition rate of 160 MHz. Two different…
View article: A compact fiber-laser-based system for detection of biological agents via coherent Raman spectroscopy
A compact fiber-laser-based system for detection of biological agents via coherent Raman spectroscopy Open
We report on a compact laser system for detection of hazardous biological agents by standoff coherent anti-Stokes Raman spectroscopy (CARS). The system is based on ytterbium-laser technology featuring broad spectral coverage and high sensi…
View article: Direct-frequency-comb spectroscopy by a scanning Fabry-Pérot microcavity resonator
Direct-frequency-comb spectroscopy by a scanning Fabry-Pérot microcavity resonator Open
We present a direct-frequency-comb spectroscopy method able to resolve the spectral comb structure with an instrumental frequency resolution limited only by the coherence properties of the comb source itself. The proposed technique, based …
View article: Multispectrum rotational states distribution thermometry: application to the 3ν<sub>1</sub> + ν<sub>3</sub> band of carbon dioxide
Multispectrum rotational states distribution thermometry: application to the 3ν<sub>1</sub> + ν<sub>3</sub> band of carbon dioxide Open
In this paper we propose multispectrum rotational states distribution thermometry as an optical method for primary thermometry. It relies on a global fitting of multiple absorption lines of the same band at different pressures. The approac…
View article: Bending modes metrology in the 14-15 $μ$m region
Bending modes metrology in the 14-15 $μ$m region Open
Frequency combs have triggered an impressive evolution of optical metrology across diverse regions of the electromagnetic spectrum, from the ultraviolet to the terahertz frequencies. An unexplored territory, however, remains in the region …
View article: Accurate deuterium spectroscopy and comparison with <i>ab initio</i> calculations
Accurate deuterium spectroscopy and comparison with <i>ab initio</i> calculations Open
International audience
View article: Few-optical-cycle pulse generation based on a non-linear fiber compressor pumped by a low-energy Yb:CALGO ultrafast laser
Few-optical-cycle pulse generation based on a non-linear fiber compressor pumped by a low-energy Yb:CALGO ultrafast laser Open
Pulse compression in a short, normal dispersion photonic-crystal fiber is investigated with a Yb:CaGdAlO 4 laser pumped by a low-power fiber-coupled single-mode diode that delivers 70-fs pulses at 1050 nm central wavelength, with 45-mW ave…
View article: Comb-locked frequency-swept synthesizer for high precision broadband spectroscopy
Comb-locked frequency-swept synthesizer for high precision broadband spectroscopy Open
Frequency combs have made optical metrology accessible to hundreds of laboratories worldwide and they have set new benchmarks in multi-species trace gas sensing for environmental, industrial and medical applications. However, current comb …
View article: Nonlinear pulse compression to 22 fs at 15.6 µJ by an all-solid-state multipass approach
Nonlinear pulse compression to 22 fs at 15.6 µJ by an all-solid-state multipass approach Open
We demonstrate nonlinear compression of pulses at 1.03 µm and repetition rate of 200 kHz generated by a ytterbium fiber laser using two cascaded all-solid-state multipass cells. The pulse duration has been compressed from 460 to 22 fs, cor…
View article: Comb-calibrated sub-Doppler spectroscopy with an external-cavity quantum cascade laser at 77 μm
Comb-calibrated sub-Doppler spectroscopy with an external-cavity quantum cascade laser at 77 μm Open
We study the frequency noise and the referencing to a near-infrared frequency comb of a widely tunable external-cavity quantum-cascade-laser that shows a relatively narrow free-running emission linewidth of 1.7 MHz. The frequency locking o…
View article: Fiber-lasers for coherent Raman detection of toxic chemical hazards
Fiber-lasers for coherent Raman detection of toxic chemical hazards Open
We report on a fiber-format laser system for Fourier-transform coherent anti-Stokes Raman spectroscopy (FT-CARS) of toxic chemical hazards, such as chemical warfare agents (CWAs). The system is based on ytterbium-fiber technology featuring…