High power single-sided Bragg reflection waveguide lasers with dual-lobed far field

Wang, L. J.; Yang, Yunhua; Zeng, Yugang; Tong, Cunzhu; Shan, X N; Zhao, Hao; Wang, R.; Yoon, Soon Fatt

doi:10.1007/s00340-012-5034-5

Cited by 9 publications

(8 citation statements)

References 17 publications

(25 reference statements)

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“…O ne-dimensional photonic bandgap crystal (PBC) lasers such as the longitudinal PBC lasers [1][2][3][4] and Bragg reflection waveguide lasers [5][6][7] have been developed for high-power and high-brightness operation. In these devices, light is confined by the photonic bandgap effect in the vertical direction rather than by total interface reflection (TIR).…”

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confidence: 99%

Control of lateral divergence in high-power, broad-area photonic crystal lasers

Rong

Xing

Wang

et al. 2016

Appl. Phys. Express

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One-dimensional photonic bandgap crystal (PBC) lasers have demonstrated ultra-low vertical divergence and record brightness; however, their future development is limited by their lateral beam quality. In this paper, a fishbone microstructure is proposed to control the lateral modes in broad-area PBC lasers. The findings reveal that the introduction of the microstructure improves the full width at half maximum of the lateral far field by 22.2% and increases the output power to a small extent. The detailed measurements show that the lateral beam parameter product decreases by 15.9%.

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confidence: 99%

Control of lateral divergence in high-power, broad-area photonic crystal lasers

Rong

Xing

Wang

et al. 2016

Appl. Phys. Express

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“…The low index difference in the reflector material allowed the electromagnetic fields to extend to the whole cavity, which reduces the FF angle of the emission beams to within several degrees of those reported in the theoretical analysis provided in Ref. [13].…”

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confidence: 80%

“…We designed the refractive indices of the BRWs to generate a near-field (NF) profile with discrete peaks, and the peak intensities decrease from the center to either side in exponential evanescence to present a two-lobed FF pattern. The mechanism behind this setup was presented in detail in our previous study [13] and can be simplified as follows. Because light propagation occurs as a zigzag wave, the optical wave emitted from the cavity is angled toward the normal plane of the cavity facet.…”

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confidence: 99%

Tapered Bragg reflection waveguide edge emitting lasers with near circular twin-beam emission

et al. 2013

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An edge emitting laser with two symmetrical near-circular spots located far field (FF) is demonstrated using tapered double-sided Bragg reflection waveguides (BRWs). The BRWs consist of six pairs of top p-type and bottom n-type Al0.1 Ga0.9 As/Al0.3 Ga0.7As Bragg reflectors with a period thickness of 850 nm. The device has a 4 o tapered angle configuration and exhibits two stable circular beams with a separation angle of 52 o. Typical FF angles of 5.87 • and 7.8 • in the lateral and vertical directions, respectively, are achieved. The lateral FF angle in the ridged section is independent of the injection current (>0.8 A) because of narrow ridge (∼10 µm) confinement. By contrast, the FF angle in the tapered section shows an increase rate of 1.2-1.66 • /A. The periodic modulation of the lasing wavelength is observed to be sensitive to self-heating effects.

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“…The FF pattern of the laser is determined by the mode shape in the cavity [23]. There exists two regimes of PBG guidance, which are respectively n eff < n 1 and n 1 < n eff < n 2 [24].…”

Section: A Theoretical Modelmentioning

confidence: 99%

High-Power Ultralow Divergence Edge-Emitting Diode Laser With Circular Beam

Wang

Tong

Tian

et al. 2015

IEEE J. Select. Topics Quantum Electron.

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A recognized drawback of edge-emitting diode lasers is their high divergence and elliptical beam shape since the first diode laser was demonstrated. In this paper, we demonstrated the ultranarrow circular beam emission from the broad area diode laser based on a modified Bragg-like waveguide. The low vertical divergence of 9.8°with 95% power content and 4.91°with the full-width at half-maximum was realized in the devices with 150 μm stripe width. The maximum output power was 4.2 W under quasi-continuous-wave operation and presently limited by thermal rollover. The detailed design principle was presented and it was found that reducing the refractive index and thickness of the defect layer was able to improve the vertical divergence and achieve the stable circular beam emission by controlling the lateral current distribution using the deep stripe. The packaged device with 90 μm stripe width demonstrated a maximum continuous wave power of 4.6 W at 10°C. A direct fiber coupling efficiency of 90.6% had been achieved with a common fiber of 105 μm core diameter.Index Terms-Semiconductor lasers, photonic bandgap, lowbeam divergence, high-power diode lasers. 1077-260X

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High power single-sided Bragg reflection waveguide lasers with dual-lobed far field

Cited by 9 publications

References 17 publications

Control of lateral divergence in high-power, broad-area photonic crystal lasers

Control of lateral divergence in high-power, broad-area photonic crystal lasers

Tapered Bragg reflection waveguide edge emitting lasers with near circular twin-beam emission

High-Power Ultralow Divergence Edge-Emitting Diode Laser With Circular Beam

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