Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Attention ESVA Patrons:

The Emilio Segrè Visual Archives’ site is moving soon and adopting an open access approach to digital image sharing. Once we have transitioned to the new site in 2021, we will no longer charge for our high-resolution digital images or usage fees (note that we do not hold copyright to all the images in our collections and you will still need to obtain permission for those which we do not own).

If you are working on a long-term project, we advise you to wait until the migration is complete so that you may obtain our copies for free. If you cannot wait, email us at nbl [at] aip.org and we will do what we can to assist you. We will not be offering refunds for past purchases.

For more information, please visit our FAQ page on the Ex Libris Universum blog. 

Bell Labs H7

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Bell Labs H7

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We charge a usage fee per photo if the photo is published, reproduced in a product or publicly exhibited. This is not a license in the legal sense. As a non-profit institution, we do not make any money providing these photographs. It is only by assessing usage fees that we are able to cover the cost of providing publication quality copies of our photos, preserving the photograph collection according to archival standards, and providing access to the collection by maintaining an online image database. The copyright holder may charge a fee in addition to our service fee.

Images are for use in educational projects only and must be used in a respectful manner.

$20.00
Image title: 
Picosecond pulse of laser light
Credit line: 
Bell Laboratories / Alcatel-Lucent USA Inc., courtesy AIP Emilio Segrè Visual Archives, Physics Today Collection
Description: 

One of the fastest events yet photographed - a picosecond pulse of laser light - is shown above. The photographic technique was described recently by researchers at Bell Telephone Laboratories. Typical tracks and the corresponding photodensitometer traces are shown in parts (a) and (b). The photodensitometer traces indicate relative bright and dark areas on the photo. The fluorescing spot, indicating the overlap of 0.53 micron and 1.05 micron wave-length pulses, is seen near the right end of each photo. The background trace on (a) was produced when the 0.53 micron pulse was decreased and the intensity of the 1.06 micron pulse was proportionately increased so that the background trace disappeared. The fluorescing spot is clearly visible.

Original format: 
1 photographic print (black and white; 8 x 10 inches)
Person(s): 
Bell Labs Innovations
Category: