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JOURNALS // Kvantovaya Elektronika // Archive

Kvantovaya Elektronika, 1998 Volume 25, Number 3, Pages 265–271 (Mi qe1175)

This article is cited in 16 papers

Control of laser radiation parameters

Spatial phase locking of linear arrays of 4 and 12 wide-aperture semiconductor laser diodes in an external cavity

V. V. Apollonova, S. I. Derzhavina, V. I. Kislova, A. A. Kazakovb, Yu. P. Koval'b, V. V. Kuz'minova, D. A. Mashkovskiia, A. M. Prokhorova

a Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
b Open Joint-Stock Company M.F. Stel'makh Polyus Research Institute, Moscow

Abstract: Spatial phase locking was achieved experimentally for radiation from linear arrays of 4 and 12 wide-aperture multimode semiconductor lasers. This phase locking was attained in an external cavity of 1 < L < 3 cm length with a plane mirror (R = 90%) by diffractive exchange of radiation between neighbouring lasers. An analysis of all possible cavity oscillation eigenmodes (supermodes) was made for a phase-locked array of 4 coupled lasers. The output radiation of this array was characterised by a high degree of coherence (with the contrast of V = 0.9). The angular width (at half-maximum) δψ was 1.2 mrad for the fundamental (ν = 1) and highest (ν = 4) supermodes, and 0.8 mrad for the modes with ν = 2 or 3, which corresponded to the diffraction limit. Full supermode selection was achieved in the 4-laser array as a result of the Talbot effect when the cavity length was L = ZT/4. The far-field distribution of the radiation was then characterised by the parameters V = 0.98 and δψ = 1.2 mrad. The corresponding parameters of a phase-locked 12-laser array were V = 0.93 for the axial propagation zone and δψ = 0.46 mrad.

PACS: 42.55.Px, 42.60.Da

Received: 21.08.1997


 English version:
Quantum Electronics, 1998, 28:3, 257–263

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