Accession Number : ADA483325


Title :   Measuring the Dispersion in Laser Cavity Mirrors using White-Light Interferometry


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS


Personal Author(s) : Goodspeed, Allison S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a483325.pdf


Report Date : Mar 2008


Pagination or Media Count : 76


Abstract : Terahertz radiation is an emerging field that has far reaching applications. There is a need for portable and affordable terahertz sources that may be used for detection of structural weaknesses in aerospace composites. One possibility for terahertz generation is a femtosecond Cr:LiSAF laser. However, controlling intracavity dispersion is necessary in order to get the ultrashort pulses needed to generate terahertz radiation. This research measures dispersion of the chirped femtosecond intracavity mirrors by employing white-light interferometry and explains the theory behind the curve-fitting process used to calculate dispersion. To compensate for the narrow reflectivity band of the mirrors, a CaF2 (calcium fluoride) window was used to increase the number of spectral fringes in the interferogram. A cavity was designed using these mirrors, and the Cr:LiSAF laser was successfully modelocked.


Descriptors :   *MODE LOCKED LASERS , *INTERFEROMETRY , INSTRUMENTATION , PULSE COMPRESSION , LASER MIRRORS , METROLOGY , DISPERSIONS , CALCIUM FLUORIDES , PULSED LASERS , MEASUREMENT , WHITE LIGHT


Subject Categories : Lasers and Masers
      Test Facilities, Equipment and Methods
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE