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

Journal Article · Fri Jan 15 00:00:00 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), Vol. 63:2
• Country of Publication: United States
• Language: English

Related Subjects

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