Accession Number:

ADA160303

Title:

Intense Excitation Source of Blue-Green Laser.

Descriptive Note:

Annual summary rept. 1 Oct 84-30 Sep 85,

Corporate Author:

HAMPTON UNIV VA DEPT OF PHYSICS AND ENGINEERING STUDIES

Personal Author(s):

Report Date:

1985-10-15

Pagination or Media Count:

20.0

Abstract:

An intense and efficient excitation source for blue-green lasers useful for the space-based satellite laser applications, underwater strategic communication, and measurement of ocean bottom profile is being developed. The source in use, hypocycloidal pinch plasma HCP, and a newly designed dense-plasma focus DPF can produce intense uv photons 200-300nm which match the absorption spectra of both near uv and blue green dye lasers 300-400nm. During the current project period, the successful enhancement of blue green laser output of both Coumarin 503 and LD490 dye through the spectral conversion of the HCP pumping light has been achieved with a converter dye BBQ. The factor of enhancement in the blue-green laser output energy of both Coumarin 503 and LD490 is almost 73. This enhancement will definitely be helpful in achieving the direct high power blue-green laser 1MW with the existing blue green dye laser. On the other hand the dense-plasma focus DPF with new optical coupling has been designed and constructed. For the optimization of the DPF device as the uv pumping light source, the velocity of current sheath and the formation of plasma focus have been measured as function of argon or argon-deuterium fill gas pressure. Finally, the blue-green dye laser LD490 has been pumped with the DPF device for preliminary tests. Experimental results with the DPF device show that the velocity of the current sheath follows the inverse relation of sq st. of pressure as expected. The blue-green dye LD490 laser output exceeded 3.1 m at the best cavity tuning of laser system. This corresponds to 3J1 cu. cm laser energy extraction.

Subject Categories:

  • Lasers and Masers
  • Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE