Lasers without inversion: Raman transitions using autoionizing resonances

Journal Article · Tue May 01 04:00:00 EDT 1990 · Physical Review, A (General Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevA.41.4727· OSTI ID:7149756

Agarwal, G S; Ravi, S ^[1]; Cooper, J ^[2]

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1. School of Physics, University of Hyderabad, Hyderabad 500134, (India)
2. Joint Institute for Laboratory Astrophysics, University of Colorado National Institute of Standards and Technology, Boulder, Colorado 80309-0440 (USA)

We consider laser action on a transition involving an autoionizing state {vert bar}{ital a}{r angle} and an initially unpopulated state {vert bar}{ital f}{r angle}, the population of which builds up because of spontaneous emission and Raman processes. The autoionizing state is pumped by a coherent field. We discuss the transient amplification of the probe field on the lasing transition for a range of parameters. The coherent field on the pumping transition leads to minima in the absorption spectra if the atomic population were in the state {vert bar}{ital f}{r angle}. Such regions of minima can be used for obtaining gain even for long times.

• OSTI ID: 7149756
• Journal Information: Physical Review, A (General Physics); (USA), Journal Name: Physical Review, A (General Physics); (USA) Vol. 41:9; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
AMPLIFICATION
ATOMS
AUTOIONIZATION
COHERENT RADIATION
DETAILED BALANCE PRINCIPLE
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
FEASIBILITY STUDIES
GAIN
INVARIANCE PRINCIPLES
IONIZATION
LASERS
OPTICAL PUMPING
PUMPING
RADIATIONS
T INVARIANCE
TRANSIENTS