Time-resolved imaging of bulk a-SiO2 upon various ultrashort excitation sequences

A. Mermillod-Blondin; C. Mauclair; A. Rosenfeld; J. Bonse; R. Stoian; E. Audouard

doi:10.1117/12.876687

11 February 2011 Time-resolved imaging of bulk a-SiO₂ upon various ultrashort excitation sequences

A. Mermillod-Blondin, C. Mauclair, A. Rosenfeld, J. Bonse, R. Stoian, E. Audouard

Proceedings Volume 7925, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XI; 79250R (2011) https://doi.org/10.1117/12.876687
Event: SPIE LASE, 2011, San Francisco, California, United States

Abstract

Ultrashort pulses lasers are tools of choice for functionalizing the bulk of transparent materials. In particular, direct photoinscription of simple photonic functions have been demonstrated. Those elementary functions rely on the local refractive index change induced when focusing an ultrashort pulse in the volume of a transparent material. The range of possibilities offered by direct photoinscription is still under investigation. To help understanding, optimizing and assessing the full potential of this method, we developed a time-resolved phase contrast microscopy setup. The imaginary part (absorption) and the real part of the laser-induced complex refractive index can be visualized in the irradiated region. The setup is based on a commercially available phase contrast microscope extended into a pump-probe scheme. The originality of our approach is that the illumination is performed by using a pulsed laser source (i.e. a probe beam). Speckle-related issues are solved by employing adequate sets of diffusers. This laser-microscopy technique has a spatial resolution of 650 nm, and the impulse response is about 300 fs. The laser-induced refractive index changes can be tracked up to milliseconds after the energy deposition. The excitation beam (the pump) is focused with a microscope objective (numerical aperture of 0.45) into the bulk of an a-SiO₂ sample. The pump beam can be temporally shaped with a SLM-based pulse shaping unit. This additional degree of flexibility allows for observing different interaction regimes. For instance, bulk material processing with femtosecond and picosecond duration pulses will be studied.

Citation Download Citation

A. Mermillod-Blondin, C. Mauclair, A. Rosenfeld, J. Bonse, R. Stoian, and E. Audouard "Time-resolved imaging of bulk a-SiO₂ upon various ultrashort excitation sequences", Proc. SPIE 7925, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XI, 79250R (11 February 2011); https://doi.org/10.1117/12.876687

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
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Phase contrast

Absorption

Picosecond phenomena

Refractive index

Microscopy

Microscopes

Absorbance

Show All Keywords

Keywords/Phrases

Search In:

Publication Years