Passively Q-switched 1.56 μm all-fiberized laser based on evanescent field interaction with bulk-structured bismuth telluride topological insulator

Joonhoi Koo, Junsu Lee, Cheolhwan Chi, Ju Han Lee

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

We experimentally investigated the use of a bulk-structured bismuth telluride (Bi2Te3) topological insulator (TI) as a saturable absorption material for passive Q-switching of a fiber laser at ∼1.56 μm. Unlike previous TI-based Q-switched laser implementations that employed high-quality nanostructured TI saturable absorbers, we chose to use a bulk-structured Bi2Te3 TI film because it is easy to fabricate. Our saturable absorber was constructed by depositing a bulk-structured, ∼13 μm thick Bi2Te3 TI film, which was prepared by using a mechanical exfoliation method, on the flat side of a side-polished fiber. The modulation depth of the evanescent field interaction-based saturable absorber was measured to be ∼10.8% at ∼1.56 μm. Passively Q-switched pulses were readily obtained by incorporating the saturable absorber into an all fiberized erbium fiber-based ring cavity. The minimum temporal width was measured to be ∼2.81 μs at a repetition rate of ∼42.8 kHz. Through an output performance comparison between our Q-switched laser and recently demonstrated Q-switched fiber lasers incorporating nanostructured TI-based saturable absorbers, the pros and cons of our bulk-structured Bi2Te3 TI-based saturable absorbers were analyzed.

Original languageEnglish
Pages (from-to)2157-2162
Number of pages6
JournalJournal of the Optical Society of America B: Optical Physics
Volume31
Issue number9
DOIs
StatePublished - 1 Sep 2014

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