Element Six helps TiSa laser cool down as project heats up

A EU-funded initiative that aims to further develop an ultrafast pulsed disk laser that will have the highest speeds and output powers ever achieved, has chosen Element Six to assist the design using its cooling crystals. The laser will improve the micromachining processes used to produce transparent materials, such as the glass for smart phones.

The project titled ÔÇÿUltrafast high-average power Ti:sapphire thin-disk oscillators and amplifiersÔÇÖ will attempt to build, as the name suggests, two high-average power ultrafast Ti:sapphire (TiSa) thin-disk laser systems, one amplifier system using chirped pulses to obtain high-energy pulses, and one high-power oscillator to achieve high repetition rates. Both will have a maximum average output power of at least 200W at a pulse duration of below 100fs.

To achieve these goals, TiSa will be used as the laser crystal material, which provides a broad bandwidth of emission and is ideal for ultrashort pulse laser systems, yet lacks good thermal properties.

The European CommissionÔÇÖs Seventh Framework Programme for Research and Technological Development, which is behind the three-year project, has appointed Element Six to assist with the thermal problems with TiSa. Element Six will further develop its low-loss, high purity single crystal chemical vapour deposition (CVD) diamond material to conduct heat off the TiSa thin-disk. Element Six hope this will improve the thermo-optical effects of the medium and allow it to be pumped at the required higher powers.

While Element SixÔÇÖs CVD diamond already has a thermal conductivity of up to 2,200W/mK as well as low birefringence and absorption rate, for this laser system application to be successful, further reductions in absorption coefficient of the CVD diamond and an increase in available area will be needed. ÔÇÿTo date, our CVD diamond material has been leveraged for a range of commercial solid-state laser systems with great success demonstrating unparalleled levels of heat extraction - enabling laser systems to operate at higher powers with improved beam quality,ÔÇÖ said Adrian Wilson, director of the technologies group at Element Six. ÔÇÿFor TiSa thin-disk, we have been called upon to further improve our existing crystal CVD diamond, extracting additional value - and we are determined to meet expectations.ÔÇÖ

Efforts on TiSa thin-disk began in December 2013, and the project was recently granted Ôé¼3.1 million by the European CommissionÔÇÖs Seventh Framework Programme for Research and Technological Development. Other partners collaborating on TiSa thin-disk include the University of Stuttgart, the Centre National de la Recherche Scientifique, Thales Optronique, Oxford Lasers and M-Squared Lasers.

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