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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 7 — Apr. 7, 2014
  • pp: 7865–7874

A femtosecond pulse fiber laser at 1935 nm using a bulk-structured Bi2Te3 topological insulator

Minwan Jung, Junsu Lee, Joonhoi Koo, Jaehyun Park, Yong-Won Song, Kwanil Lee, Sangbae Lee, and Ju Han Lee  »View Author Affiliations

Optics Express, Vol. 22, Issue 7, pp. 7865-7874 (2014)

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We experimentally demonstrate a femtosecond mode-locked, all-fiberized laser that operates in the 2 μm region and that incorporates a saturable absorber based on a bulk-structured bismuth telluride (Bi2Te3) topological insulator (TI). Our fiberized saturable absorber was prepared by depositing a mechanically exfoliated, ~30 μm-thick Bi2Te3 TI layer on a side-polished optical fiber platform. The bulk crystalline structure of the prepared Bi2Te3 layer was confirmed by Raman and X-ray photoelectron spectroscopy measurements. The modulation depth of the prepared saturable absorber was measured to be ~20.6%. Using the saturable absorber, it is shown that stable, ultrafast pulses with a temporal width of ~795 fs could readily be generated at a wavelength of 1935 nm from a thulium/holmium co-doped fiber ring cavity. This experimental demonstration confirms that bulk structured, TI-based saturable absorbers can readily be used as an ultra-fast mode-locker for 2 μm lasers.

© 2014 Optical Society of America

OCIS Codes
(140.4050) Lasers and laser optics : Mode-locked lasers
(160.4330) Materials : Nonlinear optical materials
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Lasers and Laser Optics

Original Manuscript: February 6, 2014
Revised Manuscript: March 18, 2014
Manuscript Accepted: March 19, 2014
Published: March 27, 2014

Minwan Jung, Junsu Lee, Joonhoi Koo, Jaehyun Park, Yong-Won Song, Kwanil Lee, Sangbae Lee, and Ju Han Lee, "A femtosecond pulse fiber laser at 1935 nm using a bulk-structured Bi2Te3 topological insulator," Opt. Express 22, 7865-7874 (2014)

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