Relocking and Locking Range Extension of Partially Locked AMLL Cavity Modes with Two Detuned RF Sinusoids

Krishnamoorthy, Shree; Prabhakar, Anil

doi:10.3390/photonics10070735

Open AccessCommunication

Relocking and Locking Range Extension of Partially Locked AMLL Cavity Modes with Two Detuned RF Sinusoids

by

Shree Krishnamoorthy

^1,2,*,†

and

Anil Prabhakar

¹

Indian Institute of Technology Madras, Chennai 600036, India

²

National Center for Biological Sciences, Bengaluru 560065, India

^*

Author to whom correspondence should be addressed.

^†

Current address: Tyndall National Institute, T12 R5CP Cork, Ireland.

Photonics 2023, 10(7), 735; https://doi.org/10.3390/photonics10070735

Submission received: 27 April 2023 / Revised: 11 June 2023 / Accepted: 14 June 2023 / Published: 27 June 2023

(This article belongs to the Special Issue Fiber Laser and Their Applications)

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Abstract

Actively mode-locked fiber ring lasers (AMLLs) with loss modulators are used to generate approximately

100 ps

pulses with

100 MHz

repetition. RF detuning around the fundamental frequency,

f_{0}

, causes a loss in phase lock (unlocking) of cavity modes and partial mode locking. Multiple RF inputs are shown, theoretically, to relock and extend the locking range of cavity modes in a detuned partially mode-locked AMLL. A custom-built Yb

^{3 +}

-doped AMLL with

f_{0} = 26 MHz

, and operating wavelength of

1064 nm

, was used to experimentally verify the theoretical predictions. Two RF sinusoidal signals with constant phase and equal amplitude resulted in an extension of the range by

X_{n} = 6.4 kHz

in addition to the range

R_{n} = 14.34 kHz

with single input for the mode

n = 10

. An increase in locking range was also observed for higher modes. Pulsewidth reduction to approximately

205 ps

from about

2 ns

was also observed in the AMLL.

Keywords: fiber lasers; mode locking; active mode locking; partial mode locking; laser cavity resonators; laser mode locking; laser tuning; ring lasers; laser theory; radio frequency; detuned mode locking; mode relocking

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MDPI and ACS Style

Krishnamoorthy, S.; Prabhakar, A. Relocking and Locking Range Extension of Partially Locked AMLL Cavity Modes with Two Detuned RF Sinusoids. Photonics 2023, 10, 735. https://doi.org/10.3390/photonics10070735

AMA Style

Krishnamoorthy S, Prabhakar A. Relocking and Locking Range Extension of Partially Locked AMLL Cavity Modes with Two Detuned RF Sinusoids. Photonics. 2023; 10(7):735. https://doi.org/10.3390/photonics10070735

Chicago/Turabian Style

Krishnamoorthy, Shree, and Anil Prabhakar. 2023. "Relocking and Locking Range Extension of Partially Locked AMLL Cavity Modes with Two Detuned RF Sinusoids" Photonics 10, no. 7: 735. https://doi.org/10.3390/photonics10070735

APA Style

Krishnamoorthy, S., & Prabhakar, A. (2023). Relocking and Locking Range Extension of Partially Locked AMLL Cavity Modes with Two Detuned RF Sinusoids. Photonics, 10(7), 735. https://doi.org/10.3390/photonics10070735

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Relocking and Locking Range Extension of Partially Locked AMLL Cavity Modes with Two Detuned RF Sinusoids

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