SBS pulse compression to 200 ps in a compact single-cell setup

Received: 14 September 1998 / Published online: 24 February 1999     

Chirp control in third-harmonic generation due to cross-phase modulation

Received: 16 October 1997/Revised version: 16 January 1998     

Transverse effects and mode couplings in OPOS

00 pump field. The corresponding differential equations for the time evolution of the self-consistent mode amplitudes are derived for typical cavity geometries including the propagation integrals within the crystal. We discuss the new physical effects introduced by these couplings in some typical cases. This includes a change of the OPO threshold and stable simultaneous oscillation of several mode pairs with fixed relative phases as well as oscillating self-pulsing type solutions. Received: 12 January 1998/Accepted: 11 February 1998     

Steering one-dimensional odd dark beams of finite length

This paper presents arguments for the existence and dynamics of one-dimensional odd dark beams of finite length in bulk Kerr nonlinear media. Their characteristic mixed edge–screw phase dislocations force them to steer in space. The modulational stability of these dark beams and one possible interaction scheme are discussed. Received: 26 October 1998 / Revised version: 19 January 1999 / Published online: 12 May 1999     

A tunable ultrafast spectrometer based on hollow waveguides: Demonstration in violet–blue

′ -hydroxy-5^′-methylphenyl)-benzotriazole. Received: 2 June 1998/Revised version: 31 July 1998     

Periodically poled RbTiOAsO4 femtosecond optical parametric oscillator tunable from 1.38 to 1.58 μm

4 that is continuously tunable in the signal wavelength from 1.375 to 1.575 μm and with a maximum output power of 110 mW. The signal pulses were produced with nearly transform-limited duration as short as 215 fs. Received: 27 August 1998/Revised version: 14 October 1998     

Quasi-two-dimensional dark spatial solitons and generation of mixed phase dislocations

This paper presents experimental evidence that orthogonally crossed dark soliton stripes form quasi-two-dimensional spatial solitons with a soliton constant equal to that of singly charged optical vortices. Besides the pairs of oppositely charged optical vortex solitons, the snake instability of the dark formation at moderate saturation is found to lead to generation of steering mixed edge–screw phase dislocations with zero total topological charges. Received: 26 October 1998 / Revised version: 19 January 1999 / Published online: 12 May 1999     

High-dynamic-range pulse-front steepening of amplified femtosecond pulses by third-order dispersion

Received: 9 June 1998/Revised version: 4 November 1998     

Homodyne detection of second-harmonic generation as a probe of electric fields

Received: 16 December 1998     

Investigation of the phase of the second-order susceptibility measured in off-resonant surface second-harmonic generation

Received: 20 September 1998     

Reduction of the specular reflectivity from Feinberg’s Cat conjugator operating in auto-oscillation mode

An incomplete correlation is discovered between the phase conjugate reflectivity in Feinberg’s Cat conjugator generating a train of regular pulses with the cw incident pump wave and inhibited specular reflectivity from the sample. The frequency chirp within every spike of conjugate wave is shown to affect the efficiency of the secondary phase conjugator generating auxiliary waves in the direction of Fresnel reflection of the incident wave. Received: 25 November 1998 / Revised version: 11 January 1999 / Published online: 31 March 1999     

Simultaneous measurement of pure-optical and thermo-optical nonlinearities induced by high-repetition-rate, femtosecond laser pulses: application to CS2

A simple experimental technique is presented capable of separating the contribution of purely optical Kerr effects from that of thermo-optical effects in the nonlinear response of materials under high-repetition-rate laser irradiation. The technique has been realized by combining the single-beam Z-scan method with the single-beam thermal lens measurement method. We demonstrate this technique by analysing the nonlinear response at 770 nm of CS₂ which exhibits cumulative thermal effects when irradiated by very intense femtosecond laser pulses at a 76-MHz repetition rate. Received: 3 November 1998 / Revised version: 4 January 1999 / Published online: 2 June 1999     

DC-electric-field-modified second-harmonic generation at the Si(100) surface

1 resonances for clean and H covered surfaces shift as a function of the dc field in agreement with experiment. This suggests the presence of built-in electric fields whose strength depends on the H coverage, and which are strongly localized in the subsurface region. Received: 20 September 1998     

Simultaneous measurements of second-harmonic generation and two-photon photoelectric emission from Au

Received: 1 October 1998 / Accepted: 30 October 1998     

Generation of tunable sub-picosecond pulses in the UV with a travelling wave dye laser

Received: 22 June 1998/Revised version: 3 August 1998     

Intensity noise of pump-enhanced continuous-wave optical parametric oscillators

4 (RTA), which provides a threshold pump power of 16 mW. The maximum signal wave power is 23 mW at a wavelength of 1243 nm. The spectral bandwidth of the signal wave is less than 750 kHz. Received: 3 February 1998     

Diode-laser-seeded optical parametric oscillator for airborne water vapor DIAL application in the upper troposphere and lower stratosphere

Received: 4 May 1998/Revised version: 17 July 1998     

Femtosecond nonresonant degenerate four-wave mixing at atmospheric pressure and in a free jet

2 , N₂, and CO₂. For CO₂ additional experiments have been performed at reduced pressure and in a molecular beam. By delaying the probe pulse a periodic recovery of the DFWM signal is observed. The period of these transients can be assigned unambiguously to rotational Raman transitions of the ground state within the laser bandwidth. The decay of the transients yields the collisional dephasing of the Raman-induced polarization. At zero delay also optical-field-induced birefringence of electronic nature contributes to the signal. The different time scales of the Raman and electronic effects allow us to estimate their relative strength. Received: 3 August 1998 / Revised version: 21 October 1998 / Published online: 24 February 1999     

Optical poling in a crosslinkable polymer system

Received: 30 September 1998 / Published online: 24 February 1999     

High photorefractive performance of low glass-transition-temperature polymeric composite doped with bifunctional chromophore

-1 and an index grating amplitude of about 4.3×10^-3 were obtained. Furthermore, high solubility of the dye in PVK and high stability of the photorefractive composite were also exhibited. Received: 7 January 1998/Revised version: 7 April 1998