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Phase-locking of the 2D structures

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Abstract

Experimental results on 1D and 2D phase-locking of laser diode arrays are presented. Attention is paid to the employment of the arrays consisting of wide aperture lasers diodes. Selection of the “in-phase” supermode, preferable for most of the cases, is attained in the external quarter Talbot (Lc=ZT/4=d2/2λ) cavity due to the output mirror tilt at the angle φm=λ/2d. Analysis of the parameters that influence on the phase-locking is given. Our experiments confirm theoretical predictions of the system stability and adequate selectivity for the laser diode array fill factor (FF) FF=0.6.

©1999 Optical Society of America

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Figures (4)

Fig.1.
Fig.1. Experimental setup. 1-laser diode array, 2-cylindrical lens, 3-cavity output mirror, R=50%, 4-lens (F=10 ñì), 5-videocamera, 6-monitor, 7-oscilloscope
Fig.2.
Fig.2. Far field pattern of the “out-of-phase” supermode.
Fig.3 (a).
Fig.3 (a). Far field pattern of the “in-phase” supermode for independent generation of the 2 laser diode arrays in a quarter-Talbot cavity.
Fig.3 (b).
Fig.3 (b). Far field pattern of the “in-phase” supermode for 2D phase-locking of the 2 laser diode arrays in a quarter-Talbot cavity.

Equations (9)

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δ γ ( δ L c z T ) 2 ( 1 2 π FF 2 ) 2
δ γ N 4 ( φ m / θ ) 2
δγ / γ ( 2 πFF ) 2 ( φ m γ / d ) 2
δ λ p Talbot 1 2 λ 2 2 L c ( NM β P n 2 ( G 0 NM ) )
δ λ p ne λ 2 2 L c M cos ( πv N + 1 )
δ λ p ne λ 2 2 L c M
γ γ e δ φ 2 / 2
γ 2 γ 0 2 e ( πNΔ / 8 dp ) 2
Δ < 1 10 N d
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