A laser system producing 5×1019 W/cm2 at 10 Hz

19 W/cm² have been achieved. Received: 10 March 1997/Revised version: 26 April 1997     

Continuous-wave, intracavity optical parametric oscillators: an analysis of power characteristics

Received: 29 December 1997/Revised version: 6 February 1998     

Energetic electronic ensembles: new rules for the interaction of radiation with matter

2 α, where Z is the number of cooperatively acting electrons, which leads to anomalously strong coupling between radiation and matter. Received: 13 October 1997     

Compact resonator designs for mode-locked solid-state lasers

Received: 16 February 1997/Revised version: 24 April 1997     

Picosecond UV pump/IR probe spectrometer for the 2–5 μm spectral region

-1 . Infrared absorbance changes are detected with an accuracy of 1 mOD and a time resolution of 1.8 ps. Received: 28 January 1997/Revised version: 7 April 1997     

Wide-bandwidth frequency locking of a 1083-nm extended-cavity DBR diode laser to a high-finesse Fabry–Pérot resonator

Received: 28 July 1997/Revised version: 27 November 1997     

High-power sub-10-fs Ti:sapphire oscillators

Received: 10 March 1997/Revised version: 16 April 1997     

Selfstarting femtosecond operation and transient dynamics of a diode-endpumped Cr:LiSGaF laser with a semiconductor saturable absorber mirror

Received: 16 July 1997/Revised version: 24 September 1997     

Sub-20 fs pulse generation from the mirror dispersion controlled Cr:LiSGaF and Cr:LiSAF lasers

Received: 21 March 1997/Revised Version: 9 May 1997     

Measuring the temporal intensity of ultrashort laser pulses by triple correlation

Received: 13 May 1997/Revised version: 1 August 1997     

The spatial distribution of small signal gain in a segmented hollow cathode discharge laser

Received: 5 February 1997/Revised version: 30 April 1997     

High-average-power diode-pumped femtosecond Cr:LiSAF lasers

Received: 27 February 1997/Revised version: 14 April 1997     

Spectral properties of a Tm:Ho:YAG laser in active mirror configuration

3+ :Ho³⁺:YAG laser is operated in active mirror configuration. This laser is characterised by a rather thin crystal (3 mm thickness in our experiment) and a very short resonator (about 3.2 mm). Therefore this laser is well suited for operation in a single longitudinal mode. Single-frequency operation is demonstrated with and without an intracavity etalon. It is further shown that single-frequency emission is reached with a stable cw emission. With a slight detuning of the outcoupling mirror, spiking can be achieved, resulting in an emission on different lines. The assignment of the observed laser lines to the known transitions between Stark sublevels of the ⁵I₇ and the ⁵I₈ level is discussed and compared with predictions in the literature. Received: 2 December 1997     

Two-photon photoconductivity in SiC photodiodes and its application to autocorrelation measurements of femtosecond optical pulses

Received: 18 June 1997     

Systematic evaluation and prediction of the pulse width of synchronously pumped lasers

Received: 17 March 1997/Revised version: 21 July 1997     

Optically detected carrier transport in III/V semiconductor QW structures: experiments, model calculations and applications in fast 1.55 μm laser devices

Received: 24 September 1997     

Generation of subpicosecond infrared pulses tunable between 5.2 μm and 18 μm at a repetition rate of 76 MHz

2 (2 mm thick) and GaSe (1 mm thick) crystals are applied as nonlinear media. GaSe has a larger tuning range and is more efficient in the whole spectral range than AgGaS₂. The average IR power reaches up to 2.0 mW at 8.5 μm when the GaSe crystal is used, and up to 1.3 mW at the same wavelength when AgGaS₂ is applied for the frequency conversion. Received: 17 February 1997/Revised version: 14 July 1997     

Intensity resonances in a double-mode HeNe/CH4 laser with synchronized modes

4 gas laser with an intracavity absorbing cell is studied experimentally and theoretically at a modulation frequency approximately equal to the intermode beat frequency. It is revealed that in the vicinity of the absorption-line centre the intensity of every mode for certain system parameters displays resonance structures narrower than the homogeneous line width of the absorption line. This occurs when the range of mode synchronization is near the absorption-line centre and its size is less than the homogeneous width of the absorption line. Received: 29 February 1996/Revised version: 4 February 1997     

Calculation of the bulk electromagnetic properties of thunderclouds using a two-space scattering formalism

Received: 9 July 1997 / Revised version: 30 July 1998 / Published online: 24 February 1999     

Pulse duration limitations in a diode-pumped femtosecond Kerr-lens mode-locked Cr:LiSAF laser

Received: 20 February 1997/Revised version: 24 April 1997