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Mode-locked diode laser-based two-photon polymerisation

Mode-locked diode laser-based two-photon polymerisation

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In this Letter, the authors present the construction of three-dimensional microstructures by two-photon polymerisation induced by ultrashort pulses of a mode-locked diode laser. The ultrafast light source is based on a diode laser with segmented metallisation to realise a waveguide integrated saturable absorber. It is subsequently amplified and compressed resulting in ultrashort laser pulses of 440 fs length and average output power of 160 mW at a fundamental repetition rate of 383.1 MHz. These pulses are coupled into a customised two-photon polymerisation setup. A series of suspended lines were fabricated between support cuboids for testing the process behaviour. A 3D structure with complex features was polymerised to demonstrate the high potential for mode-locked diode lasers in the field of direct laser writing.

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      • 10. Surkamp, N., Döpke, B., Brenner, C., et al: ‘Mode-locked diode lasers for THz asynchronous optical sampling’. SPIE OPTO, San Francisco, CA, USA, February 2019, (SPIE Proceedings, 10917, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII), pp. 18.
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