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Micro-cell structures with side-walls as thin as 0.70 μm and aspect ratios as high as 6.7 are fabricated by single-layer writing through two-photon-absorption (TPA) photopolymerization. The use of a moderate-numerical-aperture (N.A.) objective lens to obtain a much more elongated voxel and an in situ ultraviolet (UV) pre-exposure step to improve the sensitivity of TPA photopolymerization are the main factors responsible for the high aspect ratio and sub-diffraction-limit resolution that are achieved.

Wavelength tuneable pulses of about 100fs duration have been generated through self-mode-locking initiated by synchronous pumping of a c.w. Cr4+ : YAG laser.

A compact Cr4+:YAG tunable solid state laser pump source operating broadly around 1.48 µm has been used to pump an Er3+ fibre laser and amplifier. The laser exhibited a 55% slope efficiency and output powers in excess of 21 dBm. At 1.55 µm, the amplifier had a measured gain of 25 dB for a launched pump power of 23.6 dBm. Increased power scaling should be readily achieved.

Sub-100 fs pulse generation from a Kerr lens modelocked Cr/sup 4+/:YAG laser has been demonstrated for the first time, yielding femtosecond pulses tunable from 1.49 to 1.56 mu m with pulses as short as 90 fs obtained at 1.53 mu m.

We describe a compact, self-mode-locked. Tunable (in the second telecommunications window) all-solid-state. Cr/sup ++/:forsterite laser generating transform limited sub 70 fs pulses.