Towards an optimum saturable absorber for the multi-gigahertz harmonic mode locking of fiber lasers

Jakub Bogusławski; Grzegorz Soboń; Rafał Zybała; Jarosław Sotor

doi:10.1364/PRJ.7.001094

Photonics Research, Volume. 7, Issue 9, 1094(2019)

Towards an optimum saturable absorber for the multi-gigahertz harmonic mode locking of fiber lasers

Jakub Bogusławski^1,2、*, Grzegorz Soboń², Rafał Zybała^3,4, and Jarosław Sotor²

¹Department of Physical Chemistry of Biological Systems, Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 42/44, 01-224 Warsaw, Poland

²Laser & Fiber Electronics Group, Faculty of Electronics, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

³University Research Center Functional Materials, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland

⁴Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw, Poland

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Figures & Tables(8)

Fig. 1. Characterization of the SA. (a) SEM image of the surface of the Sb2Te3 layer. (b) Nonlinear transmittance of the Sb2Te2 SA fitted with a slow SA model with TPA. Dashed line shows a simulated nonlinear transmittance when the TPA is not included.

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Fig. 2. Setup of ultra-simple all-PM fiber laser. EDF, erbium-doped fiber; SA, saturable absorber.

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Fig. 3. Fundamental mode-locking operation. (a) Measured and simulated optical spectrum. (b) Autocorrelation trace of the output pulse with sech2 fit. (c) RF spectrum in 7 GHz range. (d) Simulated pulse duration (τ) and spectral width (Δλ) evolution along the oscillator cavity; starting point is the output coupler.

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Fig. 4. Laser performance at various harmonic numbers. (a) Output power versus pump power with linear fit. (b) Repetition rate (frep) as a function of pump power with exponential fit. (c) Calculated soliton order (N) as a function of harmonic number; gray area indicates where fundamental soliton condition is fulfilled.

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Fig. 5. Analysis of the working point of the SA. (a) Selected working points of the SA recorded during increasing the pump power plotted on the SA curve (x axis in linear scale). (b) First derivative of nonlinear transmittance curve with respect to fluence.

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Fig. 6. Harmonic mode-locking operation of 38th order. (a) Optical spectrum. (b) Autocorrelation trace of the output pulse with sech2 fit. (c) RF spectrum in 7 GHz range. (d) 3.04 GHz beat note of RF spectrum measured in 500 kHz span. (e) Oscilloscope trace of output pulses.

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Fig. 7. Polarization properties of output beam. Polarization azimuth versus degree of polarization (DOP) with measured period of 60 s.

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Table 1. Summary of the Achieved Laser Parameters Recorded during Continuous Increasing of Pump Power^a

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Table 1. Summary of the Achieved Laser Parameters Recorded during Continuous Increasing of Pump Power^a

Harmonic Order	$P_{out}$ (mW)	$E_{p}$ (pJ)	$f_{rep}$ (MHz)	$Δ λ$ (nm)	$τ$ (ps)	$F_{WP}$ ( $μJ / {cm}^{2}$ )	$Δ P_{p}$ (mW)
1	1.2	15.0	80.07	3.1	0.89	57.7	–
2	2.0	12.5	160.14	2.5	1.07	48.1	28.7
6	5.3	11.0	480.44	2.2	1.20	42.5	13.1
22	16.9	9.6	1761.61	1.9	1.54	36.9	9.8
25	17.5	8.7	2001.83	1.6	1.65	33.7	8.5
38	19.2	6.3	3042.75	1.8	2.20	24.3	5.2

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Jakub Bogusławski, Grzegorz Soboń, Rafał Zybała, Jarosław Sotor, "Towards an optimum saturable absorber for the multi-gigahertz harmonic mode locking of fiber lasers," Photonics Res. 7, 1094 (2019)

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Paper Information

Category: Lasers and Laser Optics

Received: May. 8, 2019

Accepted: Jul. 25, 2019

Published Online: Aug. 26, 2019

The Author Email: Jakub Bogusławski (jakub.boguslawski@pwr.edu.pl)

DOI:10.1364/PRJ.7.001094

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Summary of the Achieved Laser Parameters Recorded during Continuous Increasing of Pump Powera

Table 1. Summary of the Achieved Laser Parameters Recorded during Continuous Increasing of Pump Powera

Table 1. Summary of the Achieved Laser Parameters Recorded during Continuous Increasing of Pump Power^a

Table 1. Summary of the Achieved Laser Parameters Recorded during Continuous Increasing of Pump Power^a