Circular-side square microlasers with shifted output waveguide positions for mode and lasing spectrum control

Yong-Heng Zhang; Yong-Zhen Huang; Ya-Qian Ye; Yue-De Yang; Jin-Long Xiao

doi:10.1364/JOSAB.387662

Journal of the Optical Society of America B
Vol. 37,
Issue 5,
pp. 1312-1319
(2020)
•https://doi.org/10.1364/JOSAB.387662

Circular-side square microlasers with shifted output waveguide positions for mode and lasing spectrum control

Yong-Heng Zhang, Yong-Zhen Huang, Ya-Qian Ye, Yue-De Yang, and Jin-Long Xiao

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Yong-Heng Zhang, Yong-Zhen Huang, Ya-Qian Ye, Yue-De Yang, and Jin-Long Xiao, "Circular-side square microlasers with shifted output waveguide positions for mode and lasing spectrum control," J. Opt. Soc. Am. B 37, 1312-1319 (2020)

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Abstract

Circular-side square microlasers with shifted output waveguide positions are demonstrated to realize mode and lasing spectrum control. Numerical simulation results indicate that the mode $Q$ factors of the fundamental, first- and second-order transverse modes are modulated, and the output coupling efficiency of the output waveguide can be greatly improved by introducing the translation of the output waveguide. Single-mode lasing, dual-mode lasing, and three-mode lasing are experimentally realized by changing the output waveguide positions. At the optimized shifted output waveguide position, a microlaser exhibits tunable single-mode behavior with a maximum output power of 120 µW, a side-mode suppression ratio of 31 dB, and a linewidth of 42 MHz. Furthermore, the lasing characteristics of microlasers with different circular sides are compared.

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Mode	Translation $d$ (µm)	Transverse Mode Number	Wavelength (nm)	$Q$ Factor	Coupling Efficiency (%)
$A_{0}$	0	0	1546.2	$2.0 \times 10^{9}$	3.0
$A_{1}$	0	1	1548.2	$1.5 \times 10^{9}$	7.9
$A_{2}$	0	2	1550.3	$7.9 \times 10^{8}$	3.4
$B_{0}$	$\sqrt{2}$	0	1546.2	$1.9 \times 10^{9}$	4.3
$B_{1}$	$\sqrt{2}$	1	1548.2	$9.1 \times 10^{8}$	11.7
$B_{2}$	$\sqrt{2}$	2	1550.3	$3.1 \times 10^{8}$	5.2
$C_{0}$	$2 \sqrt{2}$	0	1546.2	$9.0 \times 10^{6}$	24.9
$C_{1}$	$2 \sqrt{2}$	1	1548.2	$1.1 \times 10^{6}$	36.8
$C_{2}$	$2 \sqrt{2}$	2	1550.3	$5.4 \times 10^{4}$	37.7
$D_{0}$	$3 \sqrt{2}$	0	1546.2	$2.1 \times 10^{4}$	77.3
$D_{1}$	$3 \sqrt{2}$	1	1548.4	$3.6 \times 10^{3}$	62.8
$D_{2}$	$3 \sqrt{2}$	2	1551.1	$1.6 \times 10^{3}$	82.6
$E_{0}$	$4 \sqrt{2}$	0	–	$-$	–
$E_{1}$	$4 \sqrt{2}$	1	1545.5	$1.7 \times 10^{4}$	19.6
$E_{2}$	$4 \sqrt{2}$	2	–	–	–

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Journal of the Optical Society of America B