Abstract
We demonstrate an electrically pumped, single-mode, large area, edge-emitting InGaAsP/InP two-dimensional photonic crystal (PC) Bragg laser with triangular lattice. The laser operates in the single transverse and longitudinal modes with a single lobe, near-diffraction-limited far field. We compare the performance of the triangular-lattice PC Bragg laser with the rectangular-lattice PC Bragg laser fabricated from the same wafer and find that their performances are comparable. Then, we combine two single triangular-lattice PC Bragg lasers that tilt to opposite directions by taking advantage of the symmetry of the single emitter cavity mode. The measurement results show that the combined PC Bragg lasers provide the near-diffraction-limited output beam, and the single wavelength operation is also maintained in the coherently combined broad-area PC Bragg lasers.
Highlights
High power and single wavelength semiconductor lasers are highly desired for many applications such as sensing, ranging, high-resolution spectroscopy and interferometry
In the photonic crystal (PC) Bragg laser, because both the transverse and longitudinal wavevectors are resonant with the PC, the PC Bragg laser is able to operate with the single wavelength
We demonstrate the triangular-lattice PC Bragg laser operating at the single wavelength for monolithically integrated coherent beam combining
Summary
Received: 16 March 2017 Accepted: 15 August 2017 Published: xx xx xxxx combining. We demonstrate an electrically pumped, single-mode, large area, edge-emitting InGaAsP/InP twodimensional photonic crystal (PC) Bragg laser with triangular lattice. The measurement results show that the combined PC Bragg lasers provide the near-diffraction-limited output beam, and the single wavelength operation is maintained in the coherently combined broad-area PC Bragg lasers. The PC Bragg laser structure with rectangular lattice has already been exploited to obtain the single-wavelength, near-diffraction-limited output beam[16,17,18]. We design the PC Bragg laser with triangular lattice for monolithic coherent beam combining (CBC) to scale up the output power. We further demonstrate that the coherently combined triangular-lattice PC Bragg lasers preserve the single wavelength operation and good beam quality. The experimental results show that our approach coherently combines triangular-lattice PC Bragg lasers, maintains the single wavelength operation with the near-diffraction-limited far field, and increases the total output power.
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