High-strength high-efficiency cladding light strippers with CO2 laser ablation

Gongwen Zhu; Wenxin Zheng

doi:10.1117/12.2541573

21 February 2020 High-strength high-efficiency cladding light strippers with CO₂ laser ablation

Gongwen Zhu, Wenxin Zheng

Proceedings Volume 11261, Components and Packaging for Laser Systems VI; 1126114 (2020) https://doi.org/10.1117/12.2541573
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

All-glass microstructured high-power cladding light strippers (CLSs) capable of handling hundreds of watts of cladding power or more are highly desired in cladding-pumped high power fiber laser systems. In this paper we demonstrate high strength, high efficiency CLSs with tensile strength more than 50 N, temporary bending diameter less than 6 cm and power stripping efficiency more than 7 dB/cm. These CLSs are fabricated by CO₂ laser ablation and their advantages and disadvantages are discussed. The all-glass CLSs possess outstanding heat-dissipating capability and do not require thermal management for up to a few kW of cladding power. Conventionally CLSs are fabricated by utilizing high-index polymer recoating, acid etching or CO₂ laser ablation, etc. CLSs with CO₂ laser ablation are highly preferred in many application due to their chemical free, contamination-free, noncontact manufacturing process. CLSs with CO₂ laser ablated transversal or spiral grooves have the advantages of high efficiency, short processing time. However, the fiber tensile strength is greatly reduced due to glass mini-fractures or cracks that may be introduced and propagate along the grooves. Creating holes on the optical fibers with CO₂ laser ablation is an alternative way to fabricate high efficiency CLSs. It provides greatly improved mechanical strength compared to CLSs with transversal or spiral grooves though it needs longer manufacturing time. In this paper we demonstrate high efficiency CLSs with spiral grooves and holes respectively and their optical, thermal performance and mechanical properties are discussed.

Citation Download Citation

Gongwen Zhu and Wenxin Zheng "High-strength high-efficiency cladding light strippers with CO₂ laser ablation", Proc. SPIE 11261, Components and Packaging for Laser Systems VI, 1126114 (21 February 2020); https://doi.org/10.1117/12.2541573

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KEYWORDS

Cladding

Gas lasers

Laser ablation

Fiber lasers

Optical fibers

Carbon dioxide lasers

Laser systems engineering

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