Investigations of the ultrafast laser induced melt dynamics by means of transient quantitative phase microscopy (TQPm)

Ilya Mingareev; Alexander Horn

doi:10.1117/12.782618

12 May 2008 Investigations of the ultrafast laser induced melt dynamics by means of transient quantitative phase microscopy (TQPm)

Ilya Mingareev, Alexander Horn

Author Affiliations +

Proceedings Volume 7005, High-Power Laser Ablation VII; 70050P (2008) https://doi.org/10.1117/12.782618
Event: High-Power Laser Ablation 2008, 2008, Taos, New Mexico, United States

Abstract

Modifications of bulk aluminum irradiated well above ablation threshold (F < 300 J^.cm^-2) have been investigated in situ by means of shadowgraphy and transient quantitative phase microscopy (TQPm) using ultrafast laser radiation (t_p=80 fs, λ=800 nm). This novel pump-probe technique enables quantitative time-resolved measurements of object's properties, e.g. dimensions of melt droplets and layer thickness or transient refractive index changes. A series of time-resolved phase images of vaporized material and/or melt, which are induced by n=1..8 pulses on an aluminum target, are obtained using TQPm. Dynamics and characteristics of melting, dependence of the ablated material volume on process parameters and thereby induced structural modifications have been studied. An increase of material ejection rate is observed at delay time of approximately τ=300 ns and τ>800 ns after the incident pulse. Transient refractive index modifications have been investigated in technical glass (Schott D263) by means of TQPm. By using high-repetition rate ultra-short pulsed laser radiation (t_p=400 fs, λ=1045 nm, f_rep=1 MHz) focused by a microscope objective (w₀ ≈ 4 μm) heat accumulation and thereby glass melting as well as welding is enabled. Transient optical phase variation has been measured up to τ=2.1 μs after the incident pulse and can be attributed to the generation of free charge carriers and compression forces inside glass.

Citation Download Citation

Ilya Mingareev and Alexander Horn "Investigations of the ultrafast laser induced melt dynamics by means of transient quantitative phase microscopy (TQPm)", Proc. SPIE 7005, High-Power Laser Ablation VII, 70050P (12 May 2008); https://doi.org/10.1117/12.782618

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Microscopy

Glasses

Refractive index

Aluminum

Laser ablation

Microscopes

Femtosecond phenomena

Show All Keywords

Keywords/Phrases

Search In:

Publication Years