Active and low-power laser stabilization

Details Active and low-power laser stabilization Active and low-power laser stabilization

2001-07-17

2003-05-20

Ip, Paul (Department: 2828)

Coherent light generators

Particular temperature control

C372S094000, C372S018000, C372S006000, C359S337000

Reexamination Certificate

active

06567438

ABSTRACT:

BACKGROUND
This application relates to lasers and laser stabilization.
A laser's main component is its optical cavity that encloses a laser gain medium. The simplest optical cavity includes two reflectors to reflect light between them. The laser cavity performs a number of functions in laser oscillation. For example, the laser cavity provides an optical feedback mechanism to bounce light back and forth multiple times through the laser gain medium for optical amplification. The laser cavity also selects one or more proper lasing frequencies within the gain spectral profile of the laser gain medium by requiring each selected frequency of light to be in resonance with the laser cavity. As a further example, the laser cavity operates to confine the light rays of the laser approximately along the optic axis of the laser cavity by filtering out light rays in other directions. As a result, the geometry of the laser cavity affects various characteristics of the laser.
The geometry of the laser cavity, however, may change with respect to many factors, such as environmental conditions (e.g., temperature or vibrations) and its own aging process. One notorious factor is a change in the cavity length due to the thermal expansion. Since a change in the laser cavity is time dependent, it is therefore desirable to provide an active control mechanism to stabilize the laser cavity by dynamically adjusting the cavity.


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