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Cheap and practical infra red (IR) sources are incandescent sources such as globar or hot membranes. These sources are broadband, omnidirectional, have a low efficiency and cannot be modulated faster than 100 Hz. In this paper, we show how it is possible to overcome all these limitations by taking advantage of surface waves.
We investigate Raman wavelength conversion in CF4-filled hollow-core photonic bandgap fibers. We obtain a record of more than 35% conversion efficiency in a 35cm-long, weakly pressurized, fiber at a peak power of only 2.6kW.
Single pass gain of 77mm crystal and ceramic Yb:YAG disks are compared in the 100–200K temperature range. Experiments are performed on a laser amplifier cooled through a static low pressure helium gas cell.
By employing a pair of partially overlapped supersonic gas jets, we made a separation of injection and acceleration stages of laser wakefield acceleration and produced stable, quasi-monoenergetic (10–30% FWHM) and tunable (50–300 MeV) electron beams.
Terahertz radiation from two-color laser-produced plasma is studied with simultaneous measurements of absolute two-color phases, near-field plasma currents, and far-field THz radiation. This verifies the microscopic mechanism of terahertz radiation generation at various laser intensities.
Particle-in-cell simulations show that quasimonoenergetic electron bunches with one-femtosecond initial duration may be produced from direct acceleration in a low-density gas. These bunches could find applications in ultrafast electron diffraction experiments.
Laser-wakefield-accelerated electrons were used to drive an all-optical undulator source, a 5-keV betatron X-ray source and a tunable quasi-monochromatic Compton-X-ray source. Also, we present a phase-contrast tomogram of a fly obtained with the betatron beam.
We model soft x-ray high harmonic generation and propagation driven by mid-infrared lasers. We find that multi-cycle laser pulses are ideal for generating shorter bright isolated attosecond pulses via time-gated phase-matching in high-density extended media.
Amplification of 3 ps pulses to >20GW in a 1Hz CO2 laser MOPA chain is described. Several ways and experimental progress towards increase of the peak power for 10 µm pulses are discussed.
Vacuum-UV radiation between 145–155 nm is generated from 40 fs, 800 nm 6.8 µJ pump pulses in a 34 µm core-diameter kagomé-PCF filled with 20–25 bar neon. Simulations confirm the mechanism as resonant dispersive-wave emission.
Gain is observed for the first time in gas discharges in flexible hollow-core optical fibres. Helium-xenon DC discharges in 1m long fibres show gain on three laser transitions at 3.11, 3.37 and 3.51µm.
We report on 33 W picosecond pulse laser pumped Raman comb generation with fifty spectral lines over two frequency octaves from the visible to the near infrared range obtained in hydrogen-filled hypocycloid-core Kagome HC-PCF.
We report continuous mode-hop free tuning of a sample-grating distributed Bragg reflector (SG-DBR) quantum cascade laser (QCL) operating at 4.55µm wavelength observing N2O features in this range by controlling all three sections of laser namely: front DBR, back DBR and the phase.
Raman spectroscopy of gas flowing through a hollow-core photonic crystal fiber (HC-PCF) provides simultaneous detection of N2, O2, CO2, and CH4, with detection limits between 300 and 1000 ppm for 30 s of signal averaging.
We examine the interaction of relativistic laser pulses with plasma channels formed in a nitrogen cluster jet. We observe creation of nearly pure N5+ plasma channels and ionization injected wakefield beams with energies >100 MeV.
We present a genetically optimized multi-wavelengths laser based on an aperiodic sampled grating. We show that the grating phases and amplitudes can be optimized to flatten the spectral signature allowing multi-wavelengths operation.
Intense, few-cycle infrared laser pulses centered at 1.8 µm wavelength, coupled to a new gas cell design, are employed to drive high harmonic generation with high flux down to the soft X-ray regime.
Quartz-enhanced photoacoustic spectroscopy (QEPAS) and cavity-ehnanced spectroscopy are merged in a novel gas sensor. Thanks to the intracavity power build up, sensitivity is increased by more than a factor 100 with respect to standard QEPAS.
A new concept of multi-color spectroscopy based on a dual-wavelength QCL is presented. The latter emits at two distinct wavelengths (5.26 and 6.25 µm), featuring simultaneous detection of two different gas species without any beam combining optics.
We demonstrate a photonic Ramsey interferometer using four-wave mixing in which the photon energies are analogous to atomic/molecular levels. This technique is highly promising for frequency-based quantum key distribution.
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