Opto-Electronic Advances, Vol. 3, Issue 6, 190039-1 (2020)
Compact pulsed thulium-doped fiber laser for topographical patterning of hydrogels
Elizabeth Lee1,2, Biao Sun1, Jiaqi Luo1,2, Satnam Singh1, Deepak Choudhury1, Derrick Yong1, Xia Yu1,3,*, and Qijie Wang2
- 1Singapore Institute of Manufacturing Technology, 2 Fusionopolis Way, Innovis, 138634 Singapore
- 2School of Electrical & Electronic Engi-neering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore
- 3Currently with School of Instrumentation and Optoe-lectronic Engineering, Beihang University, 37 Xueyuan Road, Beijing 100083, China
We report the generation of high energy 2 μm picosecond pulses from a thulium-doped fiber master oscillator power amplifier system. The all-fiber configuration was realized by a flexible large-mode area photonic crystal fiber (LMA-PCF). The amplifier output is a linearly-polarized 1.5 ns, 100 kHz pulse train with a pulse energy of up to 250 μJ. Pulse compression was achieved with (2+2)-pass chirped volume Bragg grating (CVBG) to obtain a 2.8 ps pulse width with a total pulse energy of 46 μJ. The overall system compactness was enabled by the all-fiber amplifier design and the multi-pass CVBG-based compressor. The laser output was then used to demonstrate high-speed direct-writing capability on a temperature-sensitive biomaterial to change its topography (i.e. fabricate microchannels, foams and pores). The topographical modifications of biomaterials are known to influence cell behavior and fate which is potentially useful in many cell and tissue engineering applications.
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