Amplified spontaneous emission and superradiant pulse from the flash-pumped atomic iodine system

Journal Article · Fri Jan 15 04:00:00 EST 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.340290· OSTI ID:5733823

Kim, G U; Lee, S S; Hahn, J W

A superradiant and amplified spontaneous transition pulse is obtained from an iodine photodissociation laser amplifier which uses i-C/sub 3/F/sub 7/I as an active molecule and is pumped with a flashlamp (full width at half maximum = 3 ..mu..s). We have observed a sharp leading pulse of superradiance whose rise time is less than 50 ns, and the amplified spontaneous emission follows the superradiance during the pumping flash. By measuring the population inversion density in the active medium of the amplifier, we have obtained the threshold condition for the superradiance to take place. Also, the buildup time and peak intensity of the pulse are measured as a function of the flashlamp input energy. By placing a reflecting mirror at a varying distance (from 173 to 673 cm) behind the amplifier, we have found a periodic intensity fluctuation in the superradiance; the period (..delta..t) depends linearly on the distance (d), i.e., ..delta..t = 2d/c, where c is the light velocity.

• Research Organization: Department of Physics, Korea Advanced Institute of Science and Technology, P.O. Box 150, Chongyangni, Seoul 131, Korea
• OSTI ID: 5733823
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 63:2; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFIERS
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
ELEMENTS
EMISSION
ENERGY
ENERGY-LEVEL DENSITY
ENERGY-LEVEL TRANSITIONS
EQUIPMENT
GAS LASERS
HALOGEN COMPOUNDS
HALOGENS
IODINE
IODINE COMPOUNDS
LASER RADIATION
LASERS
MIRRORS
NONMETALS
OPTICAL PUMPING
PERFORMANCE
PHOTON EMISSION
POPULATION INVERSION
PUMPING
RADIATIONS
STIMULATED EMISSION
SUPERRADIANCE
THRESHOLD ENERGY