READ ME File For 'Dataset for Thesis "Ultrafast Thulium-Doped Fibre Laser for Healthcare Applications"'

Dataset DOI: https://doi.org/10.5258/SOTON/D3591

Date that the file was created: July, 2025

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GENERAL INFORMATION
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ReadMe Author: Panuwat Srisamran, University of Southampton, ORCID ID: 0009-0003-2796-4168

This dataset supports the thesis entitled: Ultrafast Thulium-Doped Fibre Laser for Healthcare Applications
AWARDED BY: Univeristy of Southampton
DATE OF AWARD: 2025

DESCRIPTION OF THE DATA
The dataset contains data (measured and/or calculated) for each plot as detailed in the maintext of thesis.
The data was plotted using a commercial software (Origin plot).
Relevant fitting (as explained in the main text) was done by characterisation function in a commercial software (Origin plot).

This dataset contains:

A zipped file, entitled "Thesis_Dataset_Ultrafast_Thulium-Doped_Fibre_Laser_for_Healthcare_Applications_", contains six excel files detailed as folowed:

File name: "Chapter 2 Theoretical background" contains relevant data for plots in Chapter 2 of the thesis, the detail as followed:
Figure 2.7:  Frequency chirp induced by dispersion for different fibres in experiments.
Fiugre 2.8:  Frequency chirp induced by nonlinearity for different fibres in experiments.
Figure 2.11: Intensity dependent absorption of saturable absorbers.
Figure 2.13: Intensity dependent reflectance of SAM-1920-36-10ps, Batop with the information provided on supplier website from Ref:[152] in the main text.
Figure 2.15: (top) Wavelength-dependent transmission, (bottom) intensity-dependent transmission of the carbon nanotubes.
Figure 2.18: Simulated nonlinear transmission of the nonlinear amplifying loop mirror (NALM) with different coupling ratio.
Figure 2.21: Lyot filter transmission behaviour with different input offset-angle.
Figure 2.22: Lyot filter transmission behaviour with different fibre length at a fixed birefringence (and vice versa).
Figure 2.24: Output spectrum of conventional-soliton mode-locked laser.
Figure 2.27: Output spectrum of dissipative-soliton mode-locked laser (from simulation).

File name: "Chapter 3 ML-TDFL enabled by SESAM" contains relevant data for plots in Chapter 3 of the thesis, the detail as followed:
Figure 3.2:  (a) Amplified spontaneous emission (ASE) spectrum of the erbium/ytterbium co-doped fibre (EDF), (b) output spectrum of the erbium-doped fibre laser (EDFL), (c) output power of the EDFL.
Fiugre 3.4:  (a) Spectrum of the seed laser, (b) output spectrum of the erbium -doped master oscillator fibre amplifier (EDFA), (c) output power of the EDFA.
Figure 3.6:  (a) Output spectra with different output powers, and (b) output power efficiency of the cavity (as explained in Section 3.2.2 of the thesis). 
Figure 3.7:  (a) Oscilloscope trace of the output pulses, (b) radio frequency (RF) spectrum of the output with the span range of 40 kHz and the resolution bandwidth 3 Hz, and (c) the RF spectrum for 1 GHz spanning range with resolution bandwidth 3 kHz of the cavity (as explained in Section 3.2.2 of the thesis).
Figure 3.8:  (a) Uncompressed, and (b) compressed pulse duration of the output pulse (from the cavity as explained in Section 3.2.2 of the thesis). 
Figure 3.10: Output spectra show the capability of wavelength tuning by adjusting the polarisation controller in the cavity (as explained in Section 3.2.2 of the thesis).
Figure 3.11: (a) Output spectra with different net dispersions, and (b) the 10 dB bandwidth with different net dispersions.
Figure 3.13: (a) output power efficiency of the cavity (as explained in Section 3.3.1 of the thesis), and (b) output spectra at different powers.
Figure 3.14: (a) RF spectrum of the output with the span of 50 kHz and a resolution bandwidth of 3 Hz, and (b) the RF spectrum for 1 GHz spanning range with a resolution bandwidth of 3 kHz (from the cavity as explained in Section 3.3.1 of the thesis).
Figure 3.15: (a) Uncompressed, and (b) compressed pulse duration of the output pulse (from the cavity as explained in Section 3.3.1 of the thesis).
Figure 3.16: Comparison of measured and simulated spectrum of the mode-locked cavity.
Figure 3.17: Simulated dynamic pulse behaviours of spectral bandwidth, pulse duration, and oscillating pulse energy in the cavity.

File name: "Chapter 4 ML-TDFL enabled by CNT" contains relevant data for plots in Chapter 4 of the thesis, the detail as followed:
Figure 4.2:  Wavelength-dependent transmission of the carbon nanotube saturable absorbers (explained in Section 4.2.1 of the thesis).
Fiugre 4.4:  Measured intensity-dependent transmission of carbon nanotubes saturable absorbers (explained in Section 4.2.2 of the thesis).
Figure 4.6:  (a) output spectrum of the mode-locked thulium-doped fibre laser (explained in Section 4.3 of the thesis), and (b) the uncompressed pulse duration after amplification. 
Figure 4.7:  Compressed pulse duration of the output pulse.

File name: "Chapter 5 All-PM ML-TDFL enabled by CNT" contains relevant data for plots in Chapter 5 of the thesis, the detail as followed:
Figure 5.2:  Output spectrum of the all-PM conventional-soliton thulium mode-locked fibre laser (explained in Section 5.2.1 of the thesis) with 7-cm TDF, and 4.5-cm TDF
Fiugre 5.3:  Mode-locked spectrum of the conventional soliton using (a) RN220, (b) ADCNT, (c) DWNT, and (d) ADSWNT as a saturable absorber.
Figure 5.5:  Measured ASE, and transmitted spectra of the Lyot filter (LF) fibre length of (a) 0.5 m, (b) 0.4 m, (c) 0.3 m, (d) 0.2 m, and (e) 0.1 m.
Figure 5.7:  Output spectrum from an all-PM, conventional-soliton thulium-fibre laser with LF length of (a) 0 m, (b) 0.1 m, (c) 0.2 m, (d) 0.3 m,(e) 0.4 m, and (f) 0.5 m.
Figure 5.9:  Measured ASE spectrum of input ASE, PM1550XP, and PM2000D. 
Figure 5.11: Measured output ASE for reference ASE, direct splice with auto alignment, direct splice with manual alignment, and bridge-splice with manual alignment.
Figure 5.13: Measured ASE spectrum at input, and transmitted after the LF (explained in Section 5.3.3 of the thesis).
Figure 5.14: (a) output power efficiency of the mode-locked cavity (explained in Section 5.3.3 of the thesis), and (b) output spectra at different powers.
Figure 5.15: RF spectrum of the output signal with (a) 100 kHz span at the fundamental frequency and (b) 1 GHz span (from the cavity as explained in Section 5.3.3 of the thesis).
Figure 5.16: (a) uncompressed, and (b) compressed pulse duration of the output pulse (from the cavity as explained in Section 5.3.3 of the thesis).
Figure 5.17: (a) Power stability measurement of output signal and pump, and (b) Output spectrum with 1-hour interval time for 6 hours (from the cavity as explained in Section 5.3.3 of the thesis).
Figure 5.18: Output spectra with different net-cavity dispersions.
Figure 5.19: (a) output pulse properties with different net-cavity dispersions, Compressed pulse duration for (b) 2.4 nJ and (c) 3.2 nJ.

File name: "Chapter 6 1840 nm all-PM mode-locked laser" contains relevant data for plots in Chapter 6 of the thesis, the detail as followed:
Figure 6.2:  (a) Output power curve of the 976-nm pump laser diode (LD), and (b) output spectra of the 976-nm LD at different pump currents.
Fiugre 6.3:  (a) Output efficiency of the EDFA with different pump scheme, and (b) output spectrum of EDFA at output power of 850 mW.
Figure 6.5:  Output power stability of the developed EDFA, compared to previous in-house built EDFA and commercial EDFAs.
Figure 6.7:  (a) Output spectrum of the mode-locked cavity (explained in Section 6.3.1 of the thesis), (b) RF spectrum at the fundamental frequency (100-kHz span range; resolution bandwidth 200 Hz), (c) RF spectrum with 1-GHz span range (resolution bandwidth 20 kHz),  and (d) uncompressed pulse duration of the output pulses.
Figure 6.8:  Stretched pulse duration using from the cavity as explained in Section 6.3.1 with a stretcher. 
Figure 6.10: Output power efficiency of the first stage thulium-doped fibre amplifier.
Figure 6.12: Output efficiency of the second stage thulium-doped fibre amplifier.
Figure 6.13: Comparison of output spectrum at each stage in the laser system.
Figure 6.14: Compressed pulse duration at the output pulses.

File name: "Chapter 7 All-PM ML-TDFL enabled by NALM" contains relevant data for plots in Chapter 7 of the thesis, the detail as followed:
Figure 7.1:  (b) transmittance of the tuneable coupler at different knob positions, and (c) transmittance of the NALM-SA at different pump powers with various coupling ratio (r).
Fiugre 7.3:  Wideband ASE spectrum, and filtered spectrum with the LF.
Figure 7.4:  (a) Output powers and (b) output spectra of the laser (as explained in Section 7.2 of the thesis) at different powers.
Figure 7.5:  (a) Oscilloscope trace, (b) RF spectrum with 100-kHz span at the fundamental frequency, and (c) RF spectrum with 1-GHz span of the laser output signal (from the cavity as explained in Section 7.2 of the thesis).
Figure 7.6:  (a) Uncompressed, and (b) compressed pulses duration (from the cavity as explained in Section 7.2 of the thesis).
Figure 7.7:  (a) Output power stability and (b) output spectra measured at 1-hour time intervals for 6 hours in normal laboratory environment.


Date of data collection: 2021-2025

Information about geographic location of data collection: University of Southampton, Southampton, United Kingdom.

Related projects/Funders:
InLightenUs Transformative Healthcare 2050 project (EP/T020997/2); 
Transformative Imaging for Quantitative Biology Partnership (EP/V038036/1); 
AirGuide Photonics Programme Grant (EP/P030181/1).

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SHARING/ACCESS INFORMATION
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Licence:
CC-BY

Related publication:
https://doi.org/10.1016/j.optlastec.2025.112978
https://doi.org/10.1364/OE.559358
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