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Optics Communications

Raman and line centre oscillation selection in coherently pumped four-level fir lasers

M.‐A. Dupertuis, Rainer Salomaa, M.R. Siegrist

Published May 1, 1985• 17 citations
Publisher
DOI
10.1016/0030-4018(85)90128-2

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For some time already it has been known that off-resonantly pumped far infrared (FIR) lasers oscillate on the Raman line [1]. This feature has led to important applications such as the realisation of widely tunable CH3F lasers (150–1200 μm) [2]. Only recently it has been shown [3] that mode competition is responsible for the fact that Raman oscillation (R) dominates line centre oscillation (LC) in a three-level system. The same considerations are valid in the equivalent situation of a single refilling transition (|0 > → |1> in Fig. 1). In certain experiments [4–7] Λ and V transitions (Fig. 1) appear in combination. For this case LC and R oscillations have been observed to exist simultaneously in one of the FIR transitions [5].

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Interaction of three coherent fields with Doppler broadened serial four-level systems: Application to four-level FIR lasers

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The semiclassical density matrix treatment is applied to serial four-level systems for the steady state. Phase and energy relaxations as well as Doppler effects andMdegeneracy are accounted for. The calculations are restricted to parallel polarized fields, avoiding problems of quantum interference. The formalism is used to calculate the gain spectra of different four-level far-infrared (FIR) laser schemes: double resonance pumped laser, Raman laser, two-photon pumped laser, and hyper-Raman-laser.

IEEE Journal of Quantum Electronics•Dec 1, 1982•28 citations
For some time already it has been known that off-resonantly pumped far infrared (FIR) lasers oscillate on the Raman line [1]. This feature has led to important applications such as the realisation of widely tunable CH3F lasers (150–1200 μm) [2]. Only recently it has been shown [3] that mode competition is responsible for the fact that Raman oscillation (R) dominates line centre oscillation (LC) in a three-level system. The same considerations are valid in the equivalent situation of a single refilling transition (|0 > → |1> in Fig. 1). In certain experiments [4–7] Λ and V transitions (Fig. 1) appear in combination. For this case LC and R oscillations have been observed to exist simultaneously in one of the FIR transitions [5].
The semiclassical density matrix treatment is applied to serial four-level systems for the steady state. Phase and energy relaxations as well as Doppler effects andMdegeneracy are accounted for. The calculations are restricted to parallel polarized fields, avoiding problems of quantum interference. The formalism is used to calculate the gain spectra of different four-level far-infrared (FIR) laser schemes: double resonance pumped laser, Raman laser, two-photon pumped laser, and hyper-Raman-laser.