TY - JOUR

T1 - Coherent mode locking in a two-section laser with fast gain and absorber

AU - Arkhipov, R.

AU - Diachkova, O.

AU - Pakhomov, A.

AU - Arkhipov, M.

AU - Rosanov, N.

AU - Zhmud, B.

AU - Khabibullin, R.

N1 - Export Date: 19 October 2024 CODEN: APBOE Адрес для корреспонденции: Arkhipov, R.; Ioffe Institute, Politekhnicheskaya str. 26, Russian Federation; эл. почта: arkhipovrostislav@gmail.com Сведения о финансировании: Foundation for the Advancement of Theoretical Physics and Mathematics Сведения о финансировании: Russian Science Foundation, RSF, 24-49-10004 Сведения о финансировании: 0040-2019-0017 Текст о финансировании 1: R.A., A.P. and O.D. acknowledge support from the Foundation for the Advancement of Theoretical Physics and Mathematics \u201CBASIS\u201D. B.Z. acknowledges support from the Russian Science Foundation grant No. 24-49-10004, https://rscf.ru/en/project/24-49-10004/. Research by R.A., M.A., and N.R. is also partially supported by the State assignment of the Ioffe Institute, topic 0040-2019-0017.

PY - 2024/9/22

Y1 - 2024/9/22

N2 - Coherent mode locking is based on the formation of 2π pulses of self-induced transparency in the absorbing medium and π pulses in the amplifying medium. In this regime it becomes possible to generate ultrashort laser pulses down to one oscillation cycle with a pulse duration being much shorter than the polarization relaxation time T2 of the amplifying and absorbing medium. In this article a two-section laser model with a ring resonator based on absorbing and amplifying medium with short relaxation times has been applied. We have demonstrated a self-starting regime of coherent mode locking with picosecond and femtosecond laser pulses using numerical simulations for the given model. In addition, we have shown that there is a significant influence of generation frequency detuning on laser pulse duration and intensity. Moreover, we have compared our numerical results with an analytical model of a coherent mode-locked laser based on the area theorem. We believe that the findings of this work can open a pathway towards the practical application of mode locking in mid-IR and THz quantum cascade lasers. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

AB - Coherent mode locking is based on the formation of 2π pulses of self-induced transparency in the absorbing medium and π pulses in the amplifying medium. In this regime it becomes possible to generate ultrashort laser pulses down to one oscillation cycle with a pulse duration being much shorter than the polarization relaxation time T2 of the amplifying and absorbing medium. In this article a two-section laser model with a ring resonator based on absorbing and amplifying medium with short relaxation times has been applied. We have demonstrated a self-starting regime of coherent mode locking with picosecond and femtosecond laser pulses using numerical simulations for the given model. In addition, we have shown that there is a significant influence of generation frequency detuning on laser pulse duration and intensity. Moreover, we have compared our numerical results with an analytical model of a coherent mode-locked laser based on the area theorem. We believe that the findings of this work can open a pathway towards the practical application of mode locking in mid-IR and THz quantum cascade lasers. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

KW - Keys (for locks)

KW - Laser mode locking

KW - Laser resonators

KW - Mode-locked fiber lasers

KW - Picosecond lasers

KW - Relaxation time

KW - Ultrashort pulses

KW - Absorbing medium

KW - Coherent modes

KW - Laser modeling

KW - Modelocking

KW - Oscillation cycles

KW - Polarization relaxation

KW - Pulse durations

KW - Self-induced transparency

KW - Two-section lasers

KW - Ultrashort Laser

KW - Quantum cascade lasers

U2 - 10.1007/s00340-024-08317-7

DO - 10.1007/s00340-024-08317-7

M3 - статья

VL - 130

JO - Applied Physics B: Lasers and Optics

JF - Applied Physics B: Lasers and Optics

SN - 0946-2171

IS - 10

ER -