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A fiber coupled LIBS system is used for detection of mines and explosives. Laser excitation at 1.5 mum is preferred to generate LIBS signals using an Er:glass microchip laser as seed laser for an Yb:Er fiber amplifier.
Reliability and lifetime of quasi-CW laser diode arrays are greatly influenced by their thermal characteristics. This paper examines the thermal properties of laser diode arrays operating in long pulse duration regime.
We describe a standoff sensor for monitoring, from above 3,000 m, the natural gas transmission pipeline infrastructure. Using an EDFA, the sensor amplifies the tunable diode laser beam from a Wavelength Modulation Spectroscopy platform.
We describe measurements characterizing the interaction of ultra-high intensity Petawatt laser pulses with solid targets. Experiments were performed on the Petawatt laser at RAL, and the Titan laser at LLNL.
High-harmonic generation is achieved at 100 MHz repetition rates by utilizing a femtosecond enhancement cavity to increase peak intensities from a mode-locked laser. This provides a coherent frequency comb in the VUV for high-resolution spectroscopy.
Results for ARLpsilas breadboard chirped AM ladar using gain modulation of a short wavelength infrared band electron-bombarded active pixel sensor developed for 3D imaging and range-Doppler tracking first reported on last year are updated.
Second and third order frequency correlations of speckle intensity patterns are used to characterize scattering media for multiple polarization states.
Laser emission into modes of a dielectric microsphere was observed from optically pumped HgTe quantum dots on its surface. Including real-time measurement of the input pump losses reveals nanowatt threshold levels for these lasers.
We observed phase-matched frequency mixing of a THz wave with a near-infrared laser beam in a ZnGeP2 crystal. Such a process can be used to detect a THz wave in the range of 91-139 mum.
We have demonstrated that two-photon absorption in a 2-cm-thick bulk GaP crystal can be the mechanism for limiting the efficient generation of the ultrafast broadband THz pulses using short infrared laser pulses.
In this paper we present experimental results on flux, fluctuations and noise on an atom laser beam and discuss the implications of these measurements to high precision interferometry with atoms.
We report the first single-shot measurements of transverse and longitudinal structure of laser-generated wakefields. Real-time, non-averaged measurements of resonant wakes reveal detailed temporal and spatial features that depend on pulse energy and electron density.
RIN characteristics in a frequency stabilized MSL were experimentally and theoretically investigated. Average RIN level of less than -150 dB/Hz as well as Modal RIN reduction of approximately 3 dB were obtained from the frequency stabilized MSL.
CdSe QDs in sol-gel films are promising for nonlinear optical waveguide devices. We measured the two-photon absorption (TPA) coefficient at 820 nm in such films, and TPA-induced fluorescence over the 730-980 nm wavelength range.
We report our progress towards the realization of a tunable and narrow-band source of correlated photons for coherent manipulation of cold atoms, using a combination of four-wave mixing and electromagnetically induced transparency.
Positive thermal lens in optical element (Faraday isolator in our case) produced by absorption of high power radiation was experimentally compensated with negative thermal lens in DKDP sample self-adaptive to different radiation powers.
Thermal lens spectroscopy intra-cavity under laser operation at 1340 and 1064 nm were applied to Nd:YAG crystals in order to determine heat spectra and accurate values of fluorescence quantum efficiency, ds/dT, and dioptric power.
An atom interferometer-based gravity gradiometer is being developed for subsurface mapping and geodesy, and fundamental physics investigations from space. We report on this design effort along with the details of the current laboratory-based instrument.
A laser-accelerated beam of protons is used to isochorically heat a silicon foil to multi-eV temperatures. Proton dosimetry, self-emission, and synchronized reflective interferometry are used simultaneously to infer internal energy, temperature, and pressure.
We present a contrast filter reaching 12 orders of magnitude from micro to milliJoule input pulse with 24% efficiency. It solves contrast issue for Petawatt class lasers in microjoule seeded CPA or double CPA scheme.
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