Title page for ETD etd-08242006-115533

Type of Document Master's Thesis
Author Lally, Evan Michael
Author's Email Address evlally@vt.edu
URN etd-08242006-115533
Title A Narrow-Linewidth Laser at 1550 nm Using the Pound-Drever-Hall Stabilization Technique
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Wang, Anbo Committee Chair
Brown, Gary S. Committee Member
Heflin, James R. Committee Member
Safaai-Jazi, Ahmad Committee Member
  • Linewidth
  • Pound-Drever-Hall
  • Fabry-Perot
  • Laser
  • Infrared
  • Fiber
  • Frequency Noise
  • Phase Lock
  • Stabilization
Date of Defense 2006-08-11
Availability unrestricted
Linewidth is a measure of the frequency stability of any kind of oscillator, and it is a defining characteristic of coherent lasers. Narrow linewidth laser technology, particularly in the field of fiber-based infrared lasers, has progressed to the point where highly stable sources are commercially available with linewidths on the order of 1-100 kHz. In order to achieve a higher level of stability, the laser must be augmented by an external frequency stabilization system.

This paper presents the design and operation of a frequency locking system for infrared fiber lasers. Using the Pound-Drever-Hall technique, the system significantly reduces the linewidth of an input laser with an un-stabilized linewidth of 2 kHz. It uses a high-finesse Fabry-Perot cavity, which is mechanically and thermally isolated, as a frequency reference to measure the time-varying frequency of the input laser. An electronic feedback loop works to correct the frequency error and maintain constant optical power. Testing has proven the Pound-Drever-Hall system to be highly stable and capable of operating continuously for several seconds at a time.

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