In this work, we present for the first time a laser-based dual gas sensor utilizing silica-based Antiresonant Hollow-Core Fiber (ARHCF) operating in Near- and Mid-Infrared spectral region. A 1-m-long fiber with an 84-µm diameter air-core was implemented as low-volume absorption cell configuration simple well-known Wavelength Modulation Spectroscopy (WMS) method. The filled mixture of methane (CH4) carbon dioxide (CO2), simultaneous detection both gases demonstrated targeting their...

We present high average power picosecond and nanosecond pulse delivery at 1030 nm 1064 wavelengths respectively through a novel hollow-core Negative Curvature Fiber (NCF) for high-precision micro-machining applications.Picosecond pulses with an above 36 W energies of 92 µJ, corresponding to peak density 1.5 TWcm -2 have been transmitted the fiber without introducing any damage input output end-faces.High-energy (>1 mJ), which are ideal successfully delivered NCF coupling efficiency...

Laser-based gas sensors utilizing various light-gas interaction phenomena have proved their capacity for detecting different gases. However, achieving reasonable sensitivity, especially in the mid-infrared, is crucial. Improving sensor detectivity usually requires incorporating multipass cells, which increase path length at a cost of reduced stability. An unconventional solution comes with aid hollow-core fibers. In such fiber, light guided inside an air-core which, when filled analyte can...

In this paper we present an anti-resonant guiding, low-loss Negative Curvature Fiber (NCF) for the efficient delivery of high energy short (ns) and ultrashort (ps) pulsed laser light in green spectral region. The fabricated NCF has attenuation 0.15 dB/m 0.18 at 532 nm 515 respectively, provided robust transmission nanosecond picosecond pulses with energies 0.57 mJ (10.4 kW peak power) 30 µJ (5 MW respectively. It provides single-mode, stable (low bend-sensitivity) output maintains temporal...

Laser-based gas sensors are undergoing constant and rapid development due to their usability in numerous applications focused on e.g. monitoring of greenhouse gases concentration, safety harsh environments or medicine. Amongst many types such sensors, detectors employing the photoacoustic photothermal effect characterized by an exceptional capability delivering high selectivity combined with superb signal-to-noise ratio (SNR). In this work, we demonstrate a novel, compact sensitive nitric...

We present the first mid-infrared optical frequency comb spectrometer employing an absorption cell based on self-fabricated, all-silica antiresonant hollow-core fiber (ARHCF). The is capable of measuring sub-mL sample volumes with 26 m interaction length and noise equivalent sensitivity 8.3 × 10

In this paper, we present the pressure-driven gas flow studies in nodeless antiresonant hollow-core fibers (ARHCFs) for laser absorption spectroscopy (LAS) applications. The OpenFOAM® software was used modeling comparison with experimental data. LAS-based setup utilizing a 14.73 m long fiber, to exchange time measurements various pressure differences (1.5–5 bar). obtained results have shown that application of precise fiber geometrical representation and compressible model improves...

We demonstrate a robust and miniaturized fiber Fabry-Perot cavity-based sensor for photothermal spectroscopic signal retrieval. The proof-of-concept experiment involved the use of near-infrared pump laser to detect methane molecules on an isolated overtone 2ν3 R(4) transition located at 6057.1 cm-1. photothermal-related modulation gas refractive index was induced center interferometer, which filled with sample. Subsequently, phase change resonating probe beam measured as shift in reflected...

Abstract In this paper, we analyze the performance of diffusion-based gas distribution in antiresonant hollow-core fiber-based absorption cells. Performed theoretical analysis was based on Fick’s second law using OpenFOAM® software and finite volume method (FVM), followed by an experimental verification obtained simulations. The diffusion time tested for a 1.25 m long fiber, with laser-micromachined microchannels. Full correlation between microchannel count, position, separation rate at...

The focus of this review is our recent work to develop microstructured hollow core fibers for two applications where the flexible delivery a single mode beam desired. Also, other fiber based solutions included. High power, short-pulsed lasers are widely used micro-machining, providing high precision and quality. However, lack truly systems limits their application processing relatively small planar components. To address this, we developed hollow-core optical 1 μm green wavelength ranges....

A new heterodyne interferometric method for optical signal detection in photoacoustic or photothermal spectroscopy is demonstrated and characterized. It relies on using one laser beam the excitation of gas sample that creates refractive index changes along path, while another used to measure these changes. heterodyne-based path-length presented does not require interferometer be balanced stabilized, which significantly simplifies design. We discuss advantages this approach sensing...

In this work, we present the first demonstration of a gas sensor utilizing Wavelength Modulation Spectroscopy technique and mid-IR guiding Antiresonant Hollow-Core Fiber with record length 30 m. The self-fabricated ARHCF was used as an air-tight, low-volume absorption cell delivering extended laser-gas molecules interaction path within sensor's setup, which enabled it to efficiently detect ethane at 2996.88 cm−1. Benefiting from unique guidance properties ARHCF, reached minimum detection...

In this paper, we present a system for sequential detection of multiple gases using laser-based wavelength modulation spectroscopy (WMS) method combined with Herriot-type multi-pass cell. Concentration hydrogen sulfide (H₂S), methane (CH₄), carbon dioxide (CO₂), and ammonia (NH₃) are retrieved three distributed feedback laser diodes operating at 1574.5 nm (H₂S CO₂), 1651 1531 (NH₃). Careful adjustment parameters allows H₂S sensing single parts-per-million by volume (ppmv) level strongly...

CO2 sensing using self-fabricated all-fiber gas cells based on a hollow-core photonic crystal fiber and chirped laser dispersion spectroscopy (CLaDS) is presented. I show that CLaDS enables significant reduction of optical fringes arising from the mutlimode nature air-core bandgap (PBG) fiber, hence improving system's stability performance. By carefully selecting modulation frequency, it possible to match period interference signal (resulting coupling between fiber's guided modes) and,...

A polarization maintaining erbium-doped photonic crystal fiber laser (PM-Er-PCF), is presented. The operates in a ring cavity the near infrared wavelength range. We believe that it first report of successful realization laser. Single-wavelength and multiwavelength operation developed fibre was observed. Experimental results show with good output parameter stability over period one hour exhibits 37 dB signal-to-noise-ratio. present detailed description design process experimental...

In this work, we present femtosecond laser cutting of microchannels in a nodeless antiresonant hollow-core fiber (ARHCF). Due to its ability guide light an air core combined with exceptional light-guiding properties, ARHCF relatively non-complex structure has high application potential for laser-based gas detection. To improve the flow into core, series 250 × 30 µm were reproducibly fabricated outer cladding directly above gap between capillaries using laser. The execution time single...

Abstract In this paper, dual-band gas detection using a combination of the light-induced thermoelastic spectroscopy (LITES) and an antiresonant hollow-core fiber-based (ARHCF) absorption cell is demonstrated. The broad wavelength operation capability standard 32 kHz quartz tuning fork self-developed was exploited to demonstrate quasi-simultaneous N 2 O CO , at 4570 nm (2188.2 cm −1 ) 2006 (4985.9 ), respectively. signal analysis based on modulation technique, allowing achieve noise...

We present measurements of the dispersion two negative curvature fibers at and around 1 μm. These are suitable for beam delivery both high power ultrashort pulse lasers with one designed to operate 1030 nm other dual wavelength 515 nm. Both were found exhibit anomalous measured be 2.17±0.25 ps nm−1 km−1 fundamental mode rising 4.69±0.17 first-order in 1030-nm fiber. Dispersion double fiber was higher 3.81±0.03 guiding

In this work we present a laser-based system for standoff/remote, sensitive detection of gases based on tunable diode laser source and Wavelength Modulation Spectroscopy method (WMS). System performance was experimentally characterized. The constructed device has proven its capacity efficient methane in air at the single ppm levels distances from 10 to 50 m (distance scattering object). minimum limit estimated level ppm-m standoff arrangement measurement path approximately 20 (round trip)....

In this paper, the combination of using an anti-resonant hollow-core fiber (ARHCF), working as a gas absorption cell, and inexpensive, commercially available watch quartz tuning fork (QTF), acting detector in quartz-enhanced photothermal spectroscopy (QEPTS) sensor configuration is demonstrated. The proof-of-concept experiment involved detection methane (CH4) at 1651 nm (6057 cm-1). advantage high QTF Q-factor combined with specially designed low-noise amplifier additional wavelength...