A 2.1 μm Ho:ZBLAN waveguide chip laser with improved slope efficiency

Junha Jung; Yongsop Hwang; Dale E. Otten; Kawa R. Kurdistan; Tae Joong Eom; Ju Han Lee; David G. Lancaster

doi:10.1016/j.infrared.2026.106624

A 2.1 μm Ho:ZBLAN waveguide chip laser with improved slope efficiency

Junha Jung
, Yongsop Hwang
, Dale E. Otten
, Kawa R. Kurdistan
, Tae Joong Eom
, Ju Han Lee
, David G. Lancaster

University of Adelaide
University of Seoul
Pusan National University
ARC Centre of Excellence in Microcomb Breakthrough Science (COMBS)

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

A maximum output power of 267 mW with a slope efficiency of 62.3% was achieved, using a 37-mm long Ho:ZBLAN waveguide chip with a Ho³⁺ concentration of 1.0 mol% and a 50% reflectivity output coupler in a folded cavity. This represents an improvement over our previous demonstration. The laser output exhibited near diffraction-limited beam quality (M² = ∼1.1). Two different Ho:ZBLAN waveguide chips, with Ho³⁺ concentrations of 1.0 mol% and 2.5 mol%, were compared regarding their lasing performance. The laser output was optimized experimentally using three different output couplers with reflectivities of 50%, 70%, and 98%. The highest slope efficiency was achieved with the output coupler that had a 50% reflectivity.

Original language	English
Article number	106624
Journal	Infrared Physics and Technology
Volume	156
DOIs	https://doi.org/10.1016/j.infrared.2026.106624
State	Published - Jun 2026

Keywords

Holmium
Short-wave infrared
Waveguide chip laser
ZBLAN

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10.1016/j.infrared.2026.106624

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@article{ea4453755ffd4ed18fef56ef17b9aef8,

title = "A 2.1 μm Ho:ZBLAN waveguide chip laser with improved slope efficiency",

abstract = "A maximum output power of 267 mW with a slope efficiency of 62.3\% was achieved, using a 37-mm long Ho:ZBLAN waveguide chip with a Ho3+ concentration of 1.0 mol\% and a 50\% reflectivity output coupler in a folded cavity. This represents an improvement over our previous demonstration. The laser output exhibited near diffraction-limited beam quality (M2 = ∼1.1). Two different Ho:ZBLAN waveguide chips, with Ho3+ concentrations of 1.0 mol\% and 2.5 mol\%, were compared regarding their lasing performance. The laser output was optimized experimentally using three different output couplers with reflectivities of 50\%, 70\%, and 98\%. The highest slope efficiency was achieved with the output coupler that had a 50\% reflectivity.",

keywords = "Holmium, Short-wave infrared, Waveguide chip laser, ZBLAN",

author = "Junha Jung and Yongsop Hwang and Otten, \{Dale E.\} and Kurdistan, \{Kawa R.\} and Eom, \{Tae Joong\} and Lee, \{Ju Han\} and Lancaster, \{David G.\}",

note = "Publisher Copyright: {\textcopyright} 2026 Elsevier B.V.",

year = "2026",

month = jun,

doi = "10.1016/j.infrared.2026.106624",

language = "English",

volume = "156",

journal = "Infrared Physics and Technology",

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T1 - A 2.1 μm Ho:ZBLAN waveguide chip laser with improved slope efficiency

AU - Jung, Junha

AU - Hwang, Yongsop

AU - Otten, Dale E.

AU - Kurdistan, Kawa R.

AU - Eom, Tae Joong

AU - Lee, Ju Han

AU - Lancaster, David G.

PY - 2026/6

Y1 - 2026/6

N2 - A maximum output power of 267 mW with a slope efficiency of 62.3% was achieved, using a 37-mm long Ho:ZBLAN waveguide chip with a Ho3+ concentration of 1.0 mol% and a 50% reflectivity output coupler in a folded cavity. This represents an improvement over our previous demonstration. The laser output exhibited near diffraction-limited beam quality (M2 = ∼1.1). Two different Ho:ZBLAN waveguide chips, with Ho3+ concentrations of 1.0 mol% and 2.5 mol%, were compared regarding their lasing performance. The laser output was optimized experimentally using three different output couplers with reflectivities of 50%, 70%, and 98%. The highest slope efficiency was achieved with the output coupler that had a 50% reflectivity.

AB - A maximum output power of 267 mW with a slope efficiency of 62.3% was achieved, using a 37-mm long Ho:ZBLAN waveguide chip with a Ho3+ concentration of 1.0 mol% and a 50% reflectivity output coupler in a folded cavity. This represents an improvement over our previous demonstration. The laser output exhibited near diffraction-limited beam quality (M2 = ∼1.1). Two different Ho:ZBLAN waveguide chips, with Ho3+ concentrations of 1.0 mol% and 2.5 mol%, were compared regarding their lasing performance. The laser output was optimized experimentally using three different output couplers with reflectivities of 50%, 70%, and 98%. The highest slope efficiency was achieved with the output coupler that had a 50% reflectivity.

KW - Holmium

KW - Short-wave infrared

KW - Waveguide chip laser

KW - ZBLAN

UR - https://www.scopus.com/pages/publications/105038105414

U2 - 10.1016/j.infrared.2026.106624

DO - 10.1016/j.infrared.2026.106624

M3 - Article

AN - SCOPUS:105038105414

SN - 1350-4495

VL - 156

JO - Infrared Physics and Technology

JF - Infrared Physics and Technology

M1 - 106624

ER -

A 2.1 μm Ho:ZBLAN waveguide chip laser with improved slope efficiency

Abstract

Keywords

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