Accession Number:

AD0694287

Title:

SCHLIEREN PHOTOGRAPHY USING A MODE-LOCKED LASER AS THE LIGHT SOURCE,

Descriptive Note:

Corporate Author:

NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Personal Author(s):

• Hamal,K.
• DeMichelis,C.
• Alcock,A. J.

Report Date:

1969-03-18

Pagination or Media Count:

7.0

Abstract:

The extremely short pulses of coherent radiation emitted by a mode-locked laser permit the extension of conventional Schlieren photography to events requiring exposure times of a few picoseconds and framing rates in the gigacycle range. The usefulness of this technique has been investigated by studying the initial development of a laser-produced plasma. The experimental set-up employed a Neodymium glass laser, Q-spoiled by means of a saturable dye, emitting a 400 nsec long train of pulses having a separation of 4nsec and a duration of approximately 5 picoseconds. By passing the laser beam through an index-matched ADP crystal it was possible to illuminate the Schlieren system with the more easily recorded second harmonic radiation. The photographs obtained, which show the growth of a plasma produced by a synchronized ruby laser, clearly demonstrate the potential of picosecond light pulses in Schlieren studies. Author

Descriptors:

• *LASERS
• *PLASMAS(PHYSICS)
• SCHLIEREN PHOTOGRAPHY
• PHOTOGRAPHIC LIGHTING SYSTEMS
• CANADA

Subject Categories:

• Photography
• Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE