Sub-T/sub 2/ optical pulse generation: application to optically pumped far-infrared lasers

Journal Article · Tue May 01 04:00:00 EDT 1984 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/JQE.1984.1072429· OSTI ID:6274578

Rosenberger, A T; Chung, H K; T A, De Temple

Several polar molecules possessing strong far-infrared (FIR) transitions have been optically pumped by a mode-locked CO/sub 2/ TEA laser in a single-pass configuration. All the resulting FIR pulses are shorter than the sub-T/sub 2/ pump pulses; subnanosecond FIR pulses are observed. These short FIR pulses exhibit lethargic gain, stimulated Raman emission, and multiple-pulse superradiance. The experimental results are modeled by numerical solution of the Maxwell-density matrix equations for two fields interacting with a three-level system. Level degeneracy is included, and the pump is described by a multimode power spectrum with a parabolic envelope, resulting in a periodic train of pulses. Variation of the detuning of the pump from resonance allows simulation of the superradiant or Raman cases. This fully coherent model, which is the major contribution of this paper, explains key experimental observations such as the noncoincidence of the Raman peak with the pump modulation minimum and the enhancement of multiple-pulse superradiance due to remanent polarization.

• Research Organization: Department of Physics, University of Texas at Austin, Austin, TX 78712
• OSTI ID: 6274578
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. QE-20:5; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
CARBON DIOXIDE LASERS
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY-LEVEL TRANSITIONS
FAR INFRARED RADIATION
GAIN
GAS LASERS
INFRARED RADIATION
LASER RADIATION
LASERS
MATHEMATICAL MODELS
OPTICAL PUMPING
PHOTON EMISSION
POLARIZATION
PULSES
PUMPING
RADIATIONS
RAMAN EFFECT
STIMULATED EMISSION
SUPERRADIANCE