Sub-T2 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:6194807

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

Several polar molecules possessing strong far-infrared (FIR) transitions have been optically pumped by a mode-locked CO2 TEA laser in a single-pass configuration. All the resulting FIR pulses are shorter than the sub-T2 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. 53 references.

• Research Organization: Texas Univ., Austin
• OSTI ID: 6194807
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. QE-20; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ELECTROMAGNETIC PULSES
ELECTROMAGNETIC RADIATION
FAR INFRARED RADIATION
INFRARED RADIATION
LASERS
MODE LOCKING
OPTICAL PUMPING
PULSES
PUMPING
RADIATIONS
RAMAN SPECTRA
SPECTRA