Applied Physics Letters

Beat-frequency sub-terahertz generation via photomixing using dual continuous-wave multimode laser diodes

Y Yuanhao Zeng (Institute of Laser Engineering, The University of Osaka 1 , Suita, Osaka 565-0871,) V Verdad C. Agulto (Institute of Laser Engineering, Osaka University 2 , 2-6 Yamadaoka, Suita, Osaka 565-0871,) K Kosaku Kato T Toya Sumiyoshi (Institute of Laser Engineering, The University of Osaka 1 , Suita, Osaka 565-0871,) T Thanh Nhat Khoa Phan (Institute of Laser Engineering, The University of Osaka 1 , Suita, Osaka 565-0871,) F Fumiyoshi Kuwashima (Faculty of Science and Engineering, Department of Electrical and Electronic Engineering, Otemon Gakuin University 2 , Ibaraki, Osaka 567-8502,) M Masahiko Tani (Institute of Laser Engineering, The University of Osaka 1 , Suita, Osaka 565-0871,) M Makoto Nakajima (Institute of Laser Engineering, Osaka University 2 , 2-6 Yamadaoka, Suita, Osaka 565-0871,)

Abstract

Terahertz time-domain spectroscopy (THz-TDS) is an advanced technique for material evaluation. TDS commonly uses femtosecond pulsed lasers as the light source. Recent studies have shown that continuous-wave multimode laser diodes (CW-MLD) can be an effective complementary choice. However, CW-MLD-TDS has a discrete spectral shape with fixed frequency peaks. In this research we constructed a THz-TDS driven by dual MLDs and achieved control of internal longitudinal mode frequencies by regulating MLD temperatures. This enabled the generation and tuning of new components corresponding to the beat frequencies of longitudinal modes between MLDs. This advancement will enhance the practicality of MLD-THz-TDS for spectroscopic analysis.

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Article Details

Volume / Issue Vol. 129, Issue 2
Published July 13, 2026
ISSN 0003-6951
Publisher American Institute of Physics

Journal Info

Applied Physics Letters

American Institute of Physics
ISSN: 0003-6951 Physical Sciences

Authors (8)

Y

Yuanhao Zeng

Institute of Laser Engineering, The University of Osaka 1 , Suita, Osaka 565-0871,

V

Verdad C. Agulto

Institute of Laser Engineering, Osaka University 2 , 2-6 Yamadaoka, Suita, Osaka 565-0871,

K

Kosaku Kato

T

Toya Sumiyoshi

Institute of Laser Engineering, The University of Osaka 1 , Suita, Osaka 565-0871,

T

Thanh Nhat Khoa Phan

Institute of Laser Engineering, The University of Osaka 1 , Suita, Osaka 565-0871,

F

Fumiyoshi Kuwashima

Faculty of Science and Engineering, Department of Electrical and Electronic Engineering, Otemon Gakuin University 2 , Ibaraki, Osaka 567-8502,

M

Masahiko Tani

Institute of Laser Engineering, The University of Osaka 1 , Suita, Osaka 565-0871,

M

Makoto Nakajima

Institute of Laser Engineering, Osaka University 2 , 2-6 Yamadaoka, Suita, Osaka 565-0871,

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