We set up a self-starting passively modelocked femtosecond Cr(4+):YAG<br> laser using a low-finesse antiresonant Fabry-Perot saturable absorber<br> (A-FPSA). Stable transform-limited pulses were produced without the<br> critical cavity alignment necessary for Kerr lens modelocking. We<br> achieved 114-fs pulses with 94 mW output power at the telecommunication<br> wavelength 1.5 mu m. The pulse formation is demonstrated to be due to<br> soliton modelocking. At higher intracavity energy multiple pulsing was<br> observed and is explained by the saturation behaviour of the A-FPSA. In<br> the multipulsing regime a pulse width as short as 95 fs and an averaged<br> output power of up to 395 mW have been obtained.
Photon number squeezing of spectrally filtered sub-picosecond optical solitons
S Spalter,
M Burk,
U Strossner,
M Bohm,
A Sizmann,
Gerd Leuchs
Photon number squeezing of spectrally filtered optical solitons has been<br> observed in the sub-picosecond regime, where the Raman effect changes<br> the internal quantum structure of each pulse. 160 fs pulses were<br> propagated down a 10 m optical fibre of anomalous group velocity<br> dispersion. At energies below the soliton energy subsequent spectral<br> filtering with an optical band-pass squeezed the directly detected<br> photocurrent fluctuations to 3.2 +/- 0.1 dB (52%) below the shot-noise<br> limit. This implies 4.5 dB (65%) of soliton photon number squeezing, if<br> detection losses are taken into account. Using a spectral edge filter<br> the spectral components of the pulses are shown to contribute<br> asymmetrically to the squeezing due to stimulated Raman scattering.
Quantum non-demolition measurements with optical solitons
S Spalter,
Peter van Loock,
A Sizmann,
Gerd Leuchs
The optical Kerr effect provides an ideal quantum non-demolition<br> interaction. Experiments and proposals using this interaction are<br> reviewed with special emphasis on optical soliton pulses propagating in<br> fibres. The performance of a quantum non-demolition experiment using the<br> optical Kerr effect may be reduced by self-phase modulation of the probe<br> pulse. Proposals to overcome this limitation are discussed.
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