Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

External Laser Stabilization



John L. Hall


The summary of this epoch is two fold: first there now are real professional tools such as SimuLink that allow one to study electronic and other control systems. But the particular chips chosen, while fast, were new and quite tweeky, and prone to oscillation. So eventually the fame External Stabilizer came into operation. With later improvements it was possible to obtain sub-Hertz linewidth from a usual commercial dye laser. See Fig. 2. Now - some 17 years later, and with Jun Ye's help - the noise of cw Ti:sapphire lasers can be squashed with this externalapproach, down to noise levels of 20 mHz/Sqrt(Hz), corresponding to a laser linewidth of 1.2 millihz relative to the reference cavity.
External Laser Stabilization
Publisher Info
Book Chapter Laser Physics at the Limits,


external laser phase/frequency stabilize, external stabilizer


Hall, J. (2002), External Laser Stabilization, Book Chapter Laser Physics at the Limits, (Accessed April 21, 2024)
Created December 1, 2002, Updated February 17, 2017