TY  - CHAP
A1  - Surkamp, N
A1  - Zyla, G
A1  - Gurevich, EL
A1  - Esen, C
A1  - Klehr, A
A1  - Knigge, A
A1  - Ostendorf, A
A1  - Hofmann, MR
T1  - Mode-locked diode lasers as sources for two-photon polymerization
T2  - 3D Printed Optics and Additive Photonic Manufacturing II
N2  - In this study, we use a hybrid mode-locked external cavity diode laser with subsequent amplification and pulse compression. The system provides laser pulses of 440 fs width (assuming a sech² pulse shape) and 160 mW average output power at a repetition rate of 383.1 MHz. The laser oscillator consists of a double quantum well laser diode with a gain segment of 1080 μm length and an absorber element of 80 μm lengths. The chip’s back facet is covered with a high reflective coating, the front facet with an anti-reflective coating. The resonator itself is operated in a collimated geometry and folded by two dielectric mirrors. The used output coupler provides a transmission of 20 percent, which is coupled into a tapered amplifier. Two Faraday isolators are used to decouple the laser and the amplifier from any back reflections. Subsequently, the pulses are compressed using a single pass Martinez type pulse compressor …
Y1  - 2020
U6  - http://dx.doi.org/10.1117/12.2555890
SP  - 113490G
EP  - 113490G
PB  - International Society for Optics and Photonics
CY  - USA
ER  - 
TY  - JOUR
A1  - Surkamp, N
A1  - Zyla, G
A1  - Gurevich, Evgeny L
A1  - Klehr, A
A1  - Knigge, A
A1  - Ostendorf, Andreas
A1  - Hofmann, MR
T1  - Mode-locked diode laser-based two-photon polymerisation
JF  - Electronics Letters
N2  - 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.
KW  - laser mode locking; polymerisation; optical waveguides; high-speed optical techniques; two-photon processes; optical pulse compression; optical saturable absorption; integrated optics; semiconductor lasers
Y1  - 2020
U6  - http://dx.doi.org/10.1049/el.2019.2385
SN  - 0013-5194
VL  - 56/2020
IS  - 2
SP  - 91
EP  - 93
ER  -