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LUND UNIVERSITY LIBRARIES

Implementation of a single-shot dispersion scan at 2 µm

Garayeva, Roya LU (2025) In Lund reports on atomic physics (LRAP) PHYM03 20251
Atomic Physics
Department of Physics
Abstract
To characterize ultrashort laser pulses, several techniques have been proposed. One of the more simple and robust techniques is the dispersion scan (d-scan). The d-scan technique is capable of retrieving the spectral phase from a measurement of the second-harmonic spectrum, while the dispersion of the pulse is varied. Regardless of the advantages of traditional d-scan, a measurement with a scanning approach always takes time and the averaging over many pulses can lead to artefacts. On the other hand, capturing a full d-scan trace in a single shot is beneficial for real-time pulse diagnostics.
In this work, a single-shot d-scan implementation for a laser source with a carrier wavelength of 2 µm and 200 kHz repetition rate is presented.... (More)
To characterize ultrashort laser pulses, several techniques have been proposed. One of the more simple and robust techniques is the dispersion scan (d-scan). The d-scan technique is capable of retrieving the spectral phase from a measurement of the second-harmonic spectrum, while the dispersion of the pulse is varied. Regardless of the advantages of traditional d-scan, a measurement with a scanning approach always takes time and the averaging over many pulses can lead to artefacts. On the other hand, capturing a full d-scan trace in a single shot is beneficial for real-time pulse diagnostics.
In this work, a single-shot d-scan implementation for a laser source with a carrier wavelength of 2 µm and 200 kHz repetition rate is presented. Instead of second-harmonic generation that is most established for d-scan measurements, third-harmonic generation is employed here. This is to avoid the detection edge of conventional Si-based detectors, such as spectrometers and cameras. The core idea of this project is to prove the reliability of the single-shot d-scan method in the short-wave infrared spectral range and to perform real-time pulse diagnostics. (Less)
Popular Abstract
The LASER (Light Amplification Stimulated Emitted Radiation) evokes different ideas depending on the background of the people. Lasers operate in two regimes: continuous-wave and pulsed. In the pulsed operation, extremely short bursts of light can be emitted by the laser. This burst of light can have a duration down to the femtosecond level (10⁻¹⁵ s). Accurate knowledge of these pulses is essential for numerous applications. However, the direct measurement of these pulse durations using standard detectors is impossible as their response times are too slow to resolve such short events. So, the question arises of what is the "shortest measurable event" and how we can measure these events? These events are known as ultrashort laser pulses... (More)
The LASER (Light Amplification Stimulated Emitted Radiation) evokes different ideas depending on the background of the people. Lasers operate in two regimes: continuous-wave and pulsed. In the pulsed operation, extremely short bursts of light can be emitted by the laser. This burst of light can have a duration down to the femtosecond level (10⁻¹⁵ s). Accurate knowledge of these pulses is essential for numerous applications. However, the direct measurement of these pulse durations using standard detectors is impossible as their response times are too slow to resolve such short events. So, the question arises of what is the "shortest measurable event" and how we can measure these events? These events are known as ultrashort laser pulses whose applications span from microscopy to material processing. They are part of cutting-edge research and widely demanded technologies. Ultrashort pulses are useful because they allow to observe dynamics in these fast scales, like molecular or electronic . In this case, knowledge about the corresponding pulse duration is essential.
The comprehensive characterization of ultrashort pulses has become possible with the invention of different pulse characterization methods. The technique known as dispersion scan (d-scan) is among the most attractive ones currently, with simple and robust setups and accurate phase retrieval and pulse duration reconstruction. (Less)
Please use this url to cite or link to this publication:
author
Garayeva, Roya LU
supervisor
organization
course
PHYM03 20251
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Ultrafast optics, Dispersion scan (d-scan), Single-shot dispersion scan
publication/series
Lund reports on atomic physics (LRAP)
report number
LRAP 613
language
English
id
9204310
date added to LUP
2025-06-23 13:11:03
date last changed
2025-06-23 13:11:03
@misc{9204310,
  abstract     = {{To characterize ultrashort laser pulses, several techniques have been proposed. One of the more simple and robust techniques is the dispersion scan (d-scan). The d-scan technique is capable of retrieving the spectral phase from a measurement of the second-harmonic spectrum, while the dispersion of the pulse is varied. Regardless of the advantages of traditional d-scan, a measurement with a scanning approach always takes time and the averaging over many pulses can lead to artefacts. On the other hand, capturing a full d-scan trace in a single shot is beneficial for real-time pulse diagnostics.
In this work, a single-shot d-scan implementation for a laser source with a carrier wavelength of 2 µm and 200 kHz repetition rate is presented. Instead of second-harmonic generation that is most established for d-scan measurements, third-harmonic generation is employed here. This is to avoid the detection edge of conventional Si-based detectors, such as spectrometers and cameras. The core idea of this project is to prove the reliability of the single-shot d-scan method in the short-wave infrared spectral range and to perform real-time pulse diagnostics.}},
  author       = {{Garayeva, Roya}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{Lund reports on atomic physics (LRAP)}},
  title        = {{Implementation of a single-shot dispersion scan at 2 µm}},
  year         = {{2025}},
}