Integrated diode lasers for the generation of sub-GHz repetition rate frequency combs

Fuente: arXiv
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Main Authors: Memon, Anzal, van Rees, Albert, Mak, Jesse, Fan, Youwen, van der Slot, Peter, Bastiaens, Hubertus, Boller, Klaus-J
Format: Preprint
Published: 2024
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_version_ 1866912087346774016
author Memon, Anzal
van Rees, Albert
Mak, Jesse
Fan, Youwen
van der Slot, Peter
Bastiaens, Hubertus
Boller, Klaus-J
author_facet Memon, Anzal
van Rees, Albert
Mak, Jesse
Fan, Youwen
van der Slot, Peter
Bastiaens, Hubertus
Boller, Klaus-J
contents We demonstrate absorber-free passive and hybrid mode-locking at sub-GHz repetition rates using a hybrid integrated extended cavity diode laser around 1550 nm. The laser is based on InP as gain medium and a long Si$_3$N$_4$ feedback circuit, with three highly frequency selective microring resonators. The feedback resonators not only increases the cavity length up to 0.6 m to achieve sub-GHz repetition rates but also serve as a dispersive narrowband mirror for sharp spectral filtering, which enables Fourier domain mode-locking. We observe passive mode-locking with repetition rates below 500 MHz, with $\approx$ 15 comb lines at around 0.2 mW total power. To stabilize the repetition rate, hybrid mode-locking is demonstrated by weak RF modulation of the diode current at frequencies around 500 MHz. The RF injection reduces the Lorentzian linewidth component from 8.9 kHz to a detection limited value around 300 mHz. To measure the locking range of the repetition rate, the injected RF frequency is tuned with regard to the passive mode-locking frequency and the injected RF power is varied. The locking range increases approximately as a square-root function of the injected RF power. At 1 mW injection a wide locking range of about 80 MHz is obtained. We observe the laser maintaining stable mode-locking also when the DC diode pump current is increased from 40 mA to 190 mA, provided that the cavity length is maintained constant with thermo-refractive tuning.
format Preprint
id arxiv_https___arxiv_org_abs_2405_19916
institution arXiv
publishDate 2024
record_format arxiv
spellingShingle Integrated diode lasers for the generation of sub-GHz repetition rate frequency combs
Memon, Anzal
van Rees, Albert
Mak, Jesse
Fan, Youwen
van der Slot, Peter
Bastiaens, Hubertus
Boller, Klaus-J
Optics
Applied Physics
We demonstrate absorber-free passive and hybrid mode-locking at sub-GHz repetition rates using a hybrid integrated extended cavity diode laser around 1550 nm. The laser is based on InP as gain medium and a long Si$_3$N$_4$ feedback circuit, with three highly frequency selective microring resonators. The feedback resonators not only increases the cavity length up to 0.6 m to achieve sub-GHz repetition rates but also serve as a dispersive narrowband mirror for sharp spectral filtering, which enables Fourier domain mode-locking. We observe passive mode-locking with repetition rates below 500 MHz, with $\approx$ 15 comb lines at around 0.2 mW total power. To stabilize the repetition rate, hybrid mode-locking is demonstrated by weak RF modulation of the diode current at frequencies around 500 MHz. The RF injection reduces the Lorentzian linewidth component from 8.9 kHz to a detection limited value around 300 mHz. To measure the locking range of the repetition rate, the injected RF frequency is tuned with regard to the passive mode-locking frequency and the injected RF power is varied. The locking range increases approximately as a square-root function of the injected RF power. At 1 mW injection a wide locking range of about 80 MHz is obtained. We observe the laser maintaining stable mode-locking also when the DC diode pump current is increased from 40 mA to 190 mA, provided that the cavity length is maintained constant with thermo-refractive tuning.
title Integrated diode lasers for the generation of sub-GHz repetition rate frequency combs
topic Optics
Applied Physics
url https://arxiv.org/abs/2405.19916