Improvement of spatial and temporal coherence of a broad area laser diode using an external-cavity design with double grating feedback

Samsøe, E.; Andersen, Peter E.; Andersson‐Engels, Stefan; Petersen, Paul Michael

doi:10.1364/opex.12.000609

Cited by 19 publications

(6 citation statements)

References 18 publications

(21 reference statements)

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“…However, these lasers suffer from uncontrolled emission of several lateral modes with a multi-lobed far field pattern (Samsøe et al 2004) because of their broad emitter width along the optical slow axis (Thestrup et al 2003). Several techniques, such as external cavities employing spatial filtering for mode selection (Wolff et al 2003), have been developed to improve the beam quality.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the beam quality of a broad-area diode laser using asymmetric feedback from an external cavity

et al. 2008

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In this work, the use of an asymmetric feedback technique for improving the beam quality of a broad-area diode laser is investigated using numerical simulations. A mirror stripe is placed in the external cavity to select lateral mode and provide asymmetric feedback. The width and the position of the mirror stripe are optimized to improve the beam quality. The simulation results show a good beam quality of 0.7 • FWHM and M 2 value of 2.69.

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Section: Introductionmentioning

confidence: 99%

Improvement of the beam quality of a broad-area diode laser using asymmetric feedback from an external cavity

et al. 2008

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“…There are several demonstrated techniques to improve the beam quality in edge-emitting lasers, such as conventional spatial filtering using off-axis feedback [2], external cavity [3][4][5], tapered geometry [6], and evanescent spatial filtering [7]. High spatial quality single-mode beams can also be obtained by restricting the width of the active region of a ridge waveguide [8].…”

Section: Introductionmentioning

confidence: 99%

Spatial filtering in edge-emitting lasers by intracavity chirped photonic crystals

et al. 2020

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In this work, we report an experimental and numerical study of the intracavity spatial filtering in edge-emitting lasers using a chirped photonic crystal (PhC) as the filtering element in the near-field domain. We provide a comprehensive analysis of the near-field PhC filtering scheme and compare it to conventional spatial filtering using a variable width slit in the far-field domain. Using a two-dimensional chirped PhC as a spatial filter, we experimentally demonstrate a brightness enhancement by a factor of 1.3, considering an edge-emitting laser with a 1.5 mm cavity length, consistent with a numerical prediction of brightness enhanced by a factor of 1.7. The experimental results are theoretically confirmed by numerical integration of a spatio-temporal model of the edge-emitting laser. Furthermore, numerical results show that brightness can be further increased over a factor of 2, applying optimized spatial-filtering elements at both the front and rear facets of the lasers.

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“…Applying low anti-reflection (AR) coating to a BALD and employing external optical feedback to a BALD can limit the number of transverse modes. A variety of external feedback designs can limit the number of transverse modes of BALD and improve the beam quality [26][27][28][29][30][31][32][33][34][35][36][37][38]. The off-axis optical feedback was introduced to enhance one transverse mode and significantly increase beam quality of BALD [33,34,36,38].…”

Section: Introductionmentioning

confidence: 99%

Coherent beam combining of high power broad-area laser diode array with near diffraction limited beam quality and high power conversion efficiency

Liu¹,

Braiman²

2013

Opt. Express

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We explored a path of achieving high quality phase-locking of broad-area laser diode (BALD) array that operates at high electrical to optical power conversion efficiency (PCE). We found that (a) improving single transverse mode control for each individual BALD, (b) employing global Talbot optical coupling among diodes, and (c) enhancing strength of optical coupling among diodes are key factors in achieving high quality phase-locking of high power BALD array. Subsequently, we redesigned and improved a V-shaped external Talbot cavity and employed low reflectivity anti-reflection (AR) coated, low-"smile" BALD array to meet these three important requirements. We demonstrated near-diffraction limit far-field coherent pattern with 19% PCE and 95% visibility. The far-field angle (full-width at half-maximum (FWHM)) of center lobe was measured as 1.5 diffraction angular limited with visibility of 99% for 5A injection current and 1.6 diffraction angular limited with visibility of 95% for 14A injection current. Power scaling of diode array is discussed.

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Improvement of spatial and temporal coherence of a broad area laser diode using an external-cavity design with double grating feedback

Cited by 19 publications

References 18 publications

Improvement of the beam quality of a broad-area diode laser using asymmetric feedback from an external cavity

Improvement of the beam quality of a broad-area diode laser using asymmetric feedback from an external cavity

Spatial filtering in edge-emitting lasers by intracavity chirped photonic crystals

Coherent beam combining of high power broad-area laser diode array with near diffraction limited beam quality and high power conversion efficiency

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