The following operators can be used to better focus your queries.
( ) , AND, OR, NOT, W/#
? single char wildcard, not at start
* multi char wildcard, not at start
(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*
This guide provides a more detailed description of the syntax that is supported along with examples.
This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.
Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.
Photochemical holes that have been burned in a material may be used as a stable reference for the frequency locking of a laser.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
100% of the total text.
Page 1 of 2
Photochemical Holes as Stable References for Frequency Locking Lasers
Photochemical holes that have been burned in a material may be used as a
stable reference for the frequency locking of a laser.
As shown in Fig. 1, a light beam from a first laser 10 is passed through a
medium 12 having an imhomogeneous broadened line or spectrum to burn a
hole therein at any desired frequency omega(1), as shown in Fig. 2. The material
12 may be, for example, a free base prophyrin, H(2)P, in an n-octane matrix.
Other examples of materials suitable for hole burning as well as the method of
burning holes are described in U.S. Patent 4,101,976. The material 12 is
immersed in a liquid helium bath 14 that is maintained at a constant pressure by
The assembly containing the bath 14 and the medium 12 having the hole H
therein is transferred for use with a second laser 18. The second laser 18 passes
through the medium 12 and is usually locked at frequency omega(L) = omega(1)
+/- delta/2, where delta is the hole width, since this gives a maximum slope of
transmission versus frequency. The laser 18 is connected to conventional
stabilizer electronics 20 to provide a feedback 22 for maintaining the frequency of
laser 18 at the frequency omega(L).
Page 2 of 2
[This page contains 3 pictures or other non-text objects]