321W average power, 1GHz, 20ps 1060nm pulsed fiber MOPA source

Pulses from a gain-switched laser diode were amplified in a fiber MOPA system to produce in excess of 320W of average power in 20ps pulses at 1GHz repetition rate at 1060nm

Waveguiding and crystallographic properties of single crystal Ti:sapphire layers produced by pulsed laser deposition

Layers of Ti:Sapphire were deposited over a range 1300K-1700K, with thicknesses between 1-82 microns on sapphire substrates. These were crystalline over the entire range. Waveguiding was observed without any additional co-dopants

A new design approach for fibre DFB lasers with improved efficiency

The standard DFB laser optimisation method is critically investigated and a new design approach based on the effective cavity length is presented. By applying this method in a Erbium-Ytterbium co-doped fibre, pump-to-signal conversion ratio is increased by 40% for the same total device length and pumping conditions. The laser with proposed design is produced and the theoretical results are verified by the experimental work

Characterisation of Ti:diffused channel waveguides in sapphire

The development of Ti:diffused channel waveguides in sapphire is demonstrated and their characteristics discussed with a view to the development of a Ti:sapphire waveguide laser

Ti:sapphire waveguide laser by the thermal diffusion of Ti into sapphire

SIGLEAvailable from British Library Document Supply Centre-DSC:DXN020035 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Titanium diffused waveguides in sapphire

Fabrication of optical waveguides in sapphire by the thermal diffusion of titanium is reported. Single mode operation at λ = 633nm was observed following diffusion at 1950±30°C for up to 3.5 hours. Waveguide mode intensity profiles are given and mode depths between 6.2µm and 9.6µm were obtained in the TE polarisation

Power scaling of single-frequency ytterbium-doped fiber master oscillator power amplifier sources up to 500W

We discuss continuous-wave single-frequency master oscillator - power amplifier (MOPA) sources based on ytterbium-doped fibers (YDFs) with particular attention to their recent dramatic advances and our up-to-date experimental results. This includes a 402 W plane polarized MOPA source and a 511 W random-polarized MOPA source. In these MOPAs, the final-stage high-power amplifier could operate with high efficiency of 70% - 80% and even more, and a high gain of over 20 dB in a near diffraction-limited beam. We could see at least 7 dB enhancement of the stimulated Brillouin scattering (SBS) threshold for the 402 W polarization-maintaining (PM) YDF. In fact, we did not see any sign of SBS even at the highest output power. We eventually observed SBS appearance at around 500 W for the non-PM YDF. The observed SBS strengths were far weaker than expected in theory unless we allowed for the Brillouin gain reduction from thermal Brillouin gain broadening induced by the quantum-defect heating

Ti:sapphire channel waveguide laser by thermal diffusion of titanium into sapphire

A waveguide laser in titanium diffused sapphire is demonstrated for the first time. Threshold, slope efficiency, spectral and temporal characteristics of the laser are discussed

A new design approach for DFB lasers for improved efficiency

New design approach for DFB lasers based on increasing effective cavity length is described. Method experimentally verified in Er/Yb co-doped fibre and 37% increase in the efficiency achieved