G. Galzerano
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View article: Sub-100-fs pulses at 1030 nm with THz repetition rate using dual-frequency beat compression in photonic crystal fiber
Sub-100-fs pulses at 1030 nm with THz repetition rate using dual-frequency beat compression in photonic crystal fiber Open
We demonstrate the generation of femtosecond pulse trains at 1030 nm with repetition rates tunable from 330 GHz to 1 THz in a fully polarization-maintaining (PM) fiber system. Two detuned single-frequency lasers create a dual-frequency opt…
View article: 10-W Sub-100-fs Ultrafast Cr:ZnS/ZnSe MOPA System enabled by doping gradient engineering
10-W Sub-100-fs Ultrafast Cr:ZnS/ZnSe MOPA System enabled by doping gradient engineering Open
We report on a high-power mid-infrared femtosecond master oscillator power amplifier (MOPA) system, employing Cr:ZnS and Cr:ZnSe polycrystals with fine-tuned doping profiles. Based on the soft-aperture Kerr-lens mode-locking in the soliton…
View article: Few-cycle THz Pulse Generation in DSTMS Crystal Pumped by a 8.3-MHz Amplified Mamyshev Oscillator
Few-cycle THz Pulse Generation in DSTMS Crystal Pumped by a 8.3-MHz Amplified Mamyshev Oscillator Open
Mamyshev oscillators are an emerging class of ultrafast fiber lasers that support exceptionally broadband spectra and few-femtosecond pulse durations, making them well-suited for nonlinear frequency conversion. Despite this potential, THz …
View article: Ytterbium-laser-driven THz generation in thin lithium niobate at 1.9 kW average power in a passive enhancement cavity
Ytterbium-laser-driven THz generation in thin lithium niobate at 1.9 kW average power in a passive enhancement cavity Open
Single-cycle, high-power, high-repetition-rate THz pulse sources are becoming the cornerstone of several scientific and industrial applications. A promising and versatile method for high-power THz generation is optical rectification in non…
View article: SESAM mode-locked Nd:fiber laser at 920 nm for nonlinear optical microscopy
SESAM mode-locked Nd:fiber laser at 920 nm for nonlinear optical microscopy Open
We report on the design, modeling, and characterization of a diode-pumped Nd-doped all-polarization-maintaining fiber laser operating at 920 nm in a passively mode-locked regime enabled by a SESAM. The laser generates pulse trains with a r…
View article: Ytterbium-laser-driven THz generation in thin lithium niobate at 1.9 kW average power in a passive enhancement cavity
Ytterbium-laser-driven THz generation in thin lithium niobate at 1.9 kW average power in a passive enhancement cavity Open
Single-cycle, high-power, high-repetition-rate THz pulse sources are becoming the cornerstone of several scientific and industrial applications. A promising and versatile method for high-power THz generation is optical rectification in non…
View article: Femtosecond Mamyshev fiber oscillator started by ultra-low power microchip laser seeder at two different wavelengths: a comparison
Femtosecond Mamyshev fiber oscillator started by ultra-low power microchip laser seeder at two different wavelengths: a comparison Open
A 1-W average output power, sub-60-fs femtosecond Mamyshev fiber oscillator was reliably started by a passively Q-switched sub-ns microchip laser generating four-wave-mixing signals in a polarization-maintaining passive fiber, at either 10…
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: Comb-locked deep-ultraviolet laser system for precision mercury spectroscopy
Comb-locked deep-ultraviolet laser system for precision mercury spectroscopy Open
Doppler-broadening gas thermometry is extended to the deep-ultraviolet domain using a comb-locked laser frequency chain, expressly developed for precision spectroscopy of mercury vapors at the wavelength of 253.7 nm, in coincidence with th…
View article: Low-repetition-rate optical frequency comb
Low-repetition-rate optical frequency comb Open
Reducing the pulse repetition rate of an optical frequency comb increases the pulse energy for a given average power. This enhances the efficiency of nonlinear frequency conversion and it facilitates extending the accessible wavelength ran…
View article: A low repetition rate optical frequency comb
A low repetition rate optical frequency comb Open
Reducing the pulse repetition rate of an optical frequency comb increases the pulse energy for a given average power. This enhances the efficiency of nonlinear frequency conversion and it facilitates extending the accessible wavelength ran…
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: Versatile OSCAT time-domain THz spectrometer
Versatile OSCAT time-domain THz spectrometer Open
We report on a compact and versatile time-domain spectrometer operating in the THz spectral region from 0.2 to 2.5 THz based on ultrafast Yb:CALGO laser and photo-conductive antennas. The spectrometer operates with the optical sampling by …
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: Generation of high repetition rate THz radiation at the mill-watt-level via optical rectification in an enhancement cavity
Generation of high repetition rate THz radiation at the mill-watt-level via optical rectification in an enhancement cavity Open
We propose an experimental method for the generation of coherent terahertz radiation in the spec-tral region between 0.2 THz and 2 THz, with a high repetition rate of nearly 100 MHz, and with an average power at the milliwatt level. An Ytt…
View article: Comb-assisted mercury spectroscopy in the deep-ultraviolet: towards the development of a new primary thermometer
Comb-assisted mercury spectroscopy in the deep-ultraviolet: towards the development of a new primary thermometer Open
We report on the development of a new primary thermometer based upon high-precision spectroscopy of mercury vapors in the deep-ultraviolet region for the practical realization of the new kelvin. The line profile of the (6 s 2 ) 1 S 0 → (6 …
View article: Experimental demonstration of a low repetition rate optical frequency comb
Experimental demonstration of a low repetition rate optical frequency comb Open
Optical frequency combs operating at low repetition rate exhibit high pulse energy for a given average power. Therefore, low repetition rate frequency combs may efficiently drive nonlinear frequency conversion into the mid-infrared or extr…
View article: Mid-IR tunable CW and passively Q-switched laser operation of Dy-doped fluoride fiber
Mid-IR tunable CW and passively Q-switched laser operation of Dy-doped fluoride fiber Open
We report a comprehensive characterization of tunable continuous-wave (CW) and passive Q-switching laser performance of Dy-doped zirconium fluoride fiber emitting around 3 µm. The in-band pumped CW laser operation is investigated for pump …
View article: Low frequency-to-intensity noise conversion in a pulsed laser cavity locking by exploiting Carrier-Envelope Offset manipulation
Low frequency-to-intensity noise conversion in a pulsed laser cavity locking by exploiting Carrier-Envelope Offset manipulation Open
We report on the dependence of the frequency-to-intensity noise conversion in the locking of an ultrafast laser against a high-finesse optical resonator from the Carrier Envelope Offset (CEO) frequency. By a proper combination of the cavit…
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…