High Strobe-Rate Lasers For High-Speed Holographic Testing

K. G. Harding; M. C. Gokav; J. C. MacBain

doi:10.1117/12.936277

9 January 1984 High Strobe-Rate Lasers For High-Speed Holographic Testing

K. G. Harding, M. C. Gokav, J. C. MacBain

Proceedings Volume 0427, High Speed Photography, Videography, and Photonics I; (1984) https://doi.org/10.1117/12.936277
Event: 27th Annual Technical Symposium, 1983, San Diego, United States

Abstract

In the past, ruby lasers with pulse energies of joules have been used to perform holographic interferometry on fast-changing objects. The very short (20 to 40 nanosecond) pulse of the ruby laser was used to freeze the motion of the object in time to permit holographic recording of the object. However, the ruby laser is limited to only two to three pulses at a high strobe rate. By acousto-optically strobing an argon laser, a real-time holographic interferogram can be viewed and the fringes recorded at rates of DC to 10 kHz. The pulse length of the strobed argon laser is limited by the required amount of energy. Pulse lengths of a few microseconds only provide micro joules of argon laser light Therefore strobed argon is not practical for recording holograms of dynamic diffuse object The metal vapor laser has been found to be a reasonable compromise between ruby and strobe, argon. Continuous repetition rates of a few Hz to over 10 kHz have been shown with pulse lengths comparable to that of a ruby laser and with pulse energies that are orders of magn tude higher than an argon laser. This paper discusses the measured parameters and limitations of each of these laser sources. The specific results presented were obtained with each laser in the study of structural dynamics. Future applications of the metal vapor laser are also discussed.

Citation Download Citation

K. G. Harding, M. C. Gokav, and J. C. MacBain "High Strobe-Rate Lasers For High-Speed Holographic Testing", Proc. SPIE 0427, High Speed Photography, Videography, and Photonics I, (9 January 1984); https://doi.org/10.1117/12.936277

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