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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.
A compact multi-loop stretcher system with a pulse confining structure was demonstrated. This system generated chirped pulse with 32 ps/nm chirp rate. The energy loss in the stretcher was compensated by the OPCPA.
Control of the carrier-envelope phase by a composite glass plate is demonstrated without changing chirp or energy of the transmitted pulses. The effect is verified intracavity employing an octave-spanning laser and external with an autocorrelator.
A new pulsed spectroscopic technique combines optical heterodyne detection with frequency binning. Its utility is demonstrated via Doppler-free two-photon excitation in cesium using an injection-seeded pulsed optical parametric oscillator, operated close to the Fourier-transform limit.
We demonstrate an extreme chirped pulse modelocked laser, simultaneously generating near-transform-limited 3.9 ps optical pulses and 510 ps linearly chirped output. The design overcomes fundamental limitations of energy extraction and nonlinearities induced by gain dynamics.
All-fiber chirped-pulse amplification based on a large-mode-area Er:Yb-doped photonic-crystal fiber is presented. A dispersion-variable hybrid fiber stretcher compensates the peculiar dispersion of the hollow-core photonic-bandgap fiber compressor yielding transform-limited 440-fs pulses with 1-W average power.
A Ti:Sa laser using a combination of negatively- and positively-chirped pulse amplification (NPCPA) is demonstrated. The method suppresses spectral narrowing typically appearing in CPA lasers thus supporting bandwidth much broader than a conventional CPA.
We present a theoretical and experimental analysis of two-grating phasing in a broadband pulse mosaic compressor. The phase defaults induced by misaligned gratings and the grating gap effect are studied in a mosaic compressor scheme.
We report the findings of a detailed study of the impact of the Vulcan OPCPA pre-amplifier on contrast. Using near-field apertures, the ASE pedestal was reduced to 4x10-8 of the intensity of the main pulse.
We present a simplified, alignment-free version of spectral interferometry using optical fibers. Spectral resolution is significantly improved using spatial fringes, avoiding time-domain filtering. We demonstrate this technique by measuring temporal chirp and a 12-ps double-pulse.
We demonstrate the generation of near-Fourier-limited 9.8 plusmn 0.3 fs laser pulses with an intensity exceeding a terawatt at 30 Hz repetition rate, using noncollinear optical parametric chirped pulse amplification. Amplified fluorescence is kept below 1%.
A new Brewster cut acousto-optic programmable gain control filter combined with an AOPDF pulse shaper optimizes the spectral losses of a 10 Hz CPA Ti:sapphire regenerative amplifier to obtain 18 fs duration, 1.2%-rms stability, 107 contrast ratio.
Intense 5.1-fs pulses were generated through filamentation in argon while maintaining the CEO phase. The benefits to CEO phase control of using the generated octave-spanning spectrum for single shot f-2f spectral interferometry are also presented.
The results of experimental measurement of small surface oscillations using a femto-second laser are presented. Itpsilas shown that the use of ldquochirpedrdquo pulses allows to reduce the contribution of correlated noise to the signal-to-noise ratio.
We report on the phase locking of a rapidly frequency chirped laser to a local oscillator. Deterministic and stochastic noises affecting the chirp purity are suppressed, and phase locking occurs in less than 1 mus.
Efficient reflection prisms for pulse compression and material-dispersion compensation have been designed and demonstrated in a CPA system. Designs for 800-nm and 1030-nm ultrafast applications are realized using off-the-shelf diffraction gratings.
We present results in a comprehensive analysis of gain shaping from Nd:glass amplifiers in an effort to generate near 100 fs pulses in chirped pulse amplification. We discuss relative gain balance between the two media.
We demonstrate efficient pulse shaping using linearly-chirped gratings fabricated with amplitude masks, based on a novel forward-correction algorithm that maximizes conversion efficiency. ~20% efficiency is achieved experimentally, and can potentially reach >70% with appropriate chirp.
A numerical model of OPCPA incorporating transverse effects indicates that spatial phenomena are of critical importance. The results differ radically from those of plane-wave codes, revealing complex beam profiles and significantly altered conversion efficiencies.
We present the concept and simulation results for ARLpsilas chirped AM ladar operating with a photon counting receiver. The simulation results predict significant improvements in receiver sensitivity.
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