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In this paper passively mode-locked erbium doped fiber laser is described. With all-fiber cavity configuration 169 MHz fundamental repetition frequency and average output power of more than 30 mW were achieved. Output frequency comb spectrum of 28.5 nm and 111 fs pulses were obtained.
Nonlinear refractive index of Ar, Kr, N2 Ne, Xe, and air has been determined from the spatially dependent nonlinear spectral phase of weak femtosecond pulses propagating in sample gases under pressure between 0.05 mbar and 1 bar.
We propose and demonstrate the use of real-time optical signal processing, implemented with integrated and packaged off-the-shelf commercial technology, to enhance the security of data networks. Optical steganography, based on spread spectrum, is used to inhibit the observation of data traffic and the analysis of traffic patterns. Using optical CDMA to modulate the data, service interruption is prevented...
Ultrafast transient reflectivity has been used to probe sub-picosecond electron dynamics in ultrathin gold films as a function of thickness and morphology. The data are discussed in terms of a modified two-temperature model. The implications of the results for controlling surface photochemistry through the substrate morphology are discussed.
Material processing using high-intensity femtosecond (fs) laser pulses is a fast developing technology holding potential for direct writing of multi-dimensional optical structures in transparent media. In this work we re-examine nonlinear diffraction theory in context of fs laser processing of silica in sub-critical (input power less than the critical power of self-focusing) regime. We have applied...
Delivery of the highest energy into the smallest spot on a target within the shortest duration has been always one of the main goal of laser matter interaction experiments. The spatial distribution of a high power ultrashort laser pulse often follows Gaussian or super-Gaussian profile. However, the size of the optics in the laser beam line including the focusing optics in the target chamber is always...
In this paper we report on what we believe the first measurement of pressure dependent dispersion of femtosecond laser pulses in Ar, He, Kr, N2, Ne, Xe, and air, with the use of spectrally and spatially resolved interferometry (SSRI).
Full-field reconstruction of ultrashort laser pulses can be obtained using Modified- spectrum auto-interferometric correlation (MOSAIC) traces and the pulse spectrum. This technique is implemented using only a single interferometric autocorrelator.
We demonstrate for the first time, to our best knowledge, diode-pumped passively-mode-locked Nd:YVO4 laser, operating on the 4F3/2-4I9/2 transition of the neodymium ion at 914 nm.
We use ultrafast THz spectroscopy to study coherent plasmon oscillations in InSb. The coherent plasmons can be manipulated by optical carrier injection and engineered structures that induce Landau damping.
The ionization rate of Ar with circularly polarized ultrashort laser pulses shows a spatial dependence attributable to the carrier-envelope phase of the pulse. A numerical simulation shows similar characteristics.
We demonstrate the modulation of both nanosecond and 100 femtosecond pulses in a medium coherently prepared by adiabatic evolution. Strong enhancement in the modulation of pulses of both durations was observed
Front-end of a double-CPA multiterawatt Ti:sapphire laser is presented. Methods for ASE subtraction are investigated experimentally. Damping of the pre- and post-pulses for 3 orders of magnitude and steepening of the pulse front are observed
Broadband THz-radiation emitter using n-type InAs is demonstrated. The high-frequency component of THz-radiation spectrum originating from the hybrid modes of the plasmons and the LO phonons is found to be enhanced by external magnetic field.
Summary form only given. Since the discovery of high transition temperature superconductivity more than decade ago a controversial debate still exists on the underlying pairing mechanism not yet resolved. A key parameter is the carrier concentration in the conducting copper-oxide planes, which, in the case of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO), is varied by altering the oxygen content...
Summary form only given. We have constructed a self-mode-locked Cr:LiSAF laser pumped by a single self-injection-locked semiconductor laser, which requires less than 75 mW of pump power to produce sub-100-fs pulses. The mode-locked operation was highly stable, as evidenced by a streak camera evaluation in the subpicosecond regime previously accessible only with phase-locked lasers.
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