CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Collinear, two-color optical Kerr effect shutter for ultrafast time-resolved imaging

H. Purwar ; S. Idlahcen ; C. Roze ; David Sedarsky (Institutionen för tillämpad mekanik, Förbränning) ; J. B. Blaisot
Optics Express (1094-4087). Vol. 22 (2014), 13, p. 15778-15790.
[Artikel, refereegranskad vetenskaplig]

Imaging with ultrashort exposure times is generally achieved with a crossed-beam geometry. In the usual arrangement, an off-axis gating pulse induces birefringence in a medium exhibiting a strong Kerr response (commonly carbon disulfide) which is followed by a polarizer aligned to fully attenuate the on-axis imaging beam. By properly timing the gate pulse, imaging light experiences a polarization change allowing time-dependent transmission through the polarizer to form an ultrashort image. The crossed-beam system is effective in generating short gate times, however, signal transmission through the system is complicated by the crossing angle of the gate and imaging beams. This work presents a robust ultrafast time-gated imaging scheme based on a combination of type-I frequency doubling and a collinear optical arrangement in carbon disulfide. We discuss spatial effects arising from crossed-beam Kerr gating, and examine the imaging spatial resolution and transmission timing affected by collinear activation of the Kerr medium, which eliminates crossing angle spatial effects and produces gate times on the order of 1 ps. In addition, the collinear, two-color system is applied to image structure in an optical fiber and a gasoline fuel spray, in order to demonstrate image formation utilizing ballistic or refracted light, selected on the basis of its transmission time. (C) 2014 Optical Society of America

Nyckelord: LASER-LIGHT SCATTERING, MEDIA, SIMULATION, GATE, Optics



Denna post skapades 2014-07-24. Senast ändrad 2015-02-11.
CPL Pubid: 200689

 

Läs direkt!

Lokal fulltext (fritt tillgänglig)

Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Förbränning

Ämnesområden

Optik
Optisk fysik

Chalmers infrastruktur