Spatial phase locking of linear arrays of 4 and 12 wide-aperture semiconductor laser diodes in an external cavity
- A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
- M.F. Stel'makh Polyus Research and Development Institute, Moscow (Russian Federation)
- Natural Science Center, A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
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) dy was 1.2 mrad for the fundamental ({nu} =1) and highest ({nu} =4) supermodes, and 0.8 mrad for the modes with {nu} =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=Z{sub T}/4. The far-field distribution of the radiation was then characterised by the parameters V=0.98 and {delta}{psi} = 1.2 mrad. The corresponding parameters of a phase-locked 12-laser array were V=0.93 for the axial propagation zone and {delta}{psi} =0.46 mrad. (control of laser radiation parameters)
- OSTI ID:
- 21439422
- Journal Information:
- Quantum Electronics (Woodbury, N.Y.), Vol. 28, Issue 3; Other Information: DOI: 10.1070/QE1998v028n03ABEH001175; ISSN 1063-7818
- Country of Publication:
- United States
- Language:
- English
Similar Records
Measurement of B{yields}{rho}l{nu} decay and |V{sub ub}|
Influence of the Talbot cavity selectivity on the evolution of collective operation of diffraction-coupled laser arrays