Two-port InGaAsP/InP square resonator microlasers

Abstract

Two-port InGaAsP/InP square resonator microlasers with a side length of 20 mm have been fabricated by the planar technology process, which have two 1 mm-wide output ports connected to the vertices of the square resonator. Continuous-wave electrically injected microsquare lasers have been realised at room temperature with mode Q-factors of 1.75 × 10 4 at the threshold current.Introduction: Microcavity lasers fabricated by planar technology processes are potential light sources in photonic integrated circuits. Microdisc lasers have attracted a great deal of attention in the past two decades owing to their low threshold and small cavity volume. To obtain directional emission and high power output, various schemes of deformed circular cavities were proposed, such as quadrupolar shaped cylinder laser [1], spiral-shaped micropillars [2], stadiumshaped polymer microlasers [3], and limaçon-shaped chaotic microcavity [4]. In addition, square resonators were also investigated for possible device applications too [5][6][7], and directional emission square resonator microlasers were fabricated with an output waveguide connected to the mid-point of one side of the resonator [8,9].In this Letter, we report the lasing characteristics of InGaAsP/InP square resonator microlasers with two output waveguides connected to the vertices of the square resonator, which can be used to build twodimensional blocks in photonic circuits for optical signal processing.

Room Temperature Electrically Pumped Four-Port Square Resonator Microlasers

“…The upper layers are a 1.5-μm-thick p-InP and a p+-InGaAs ohmic contact layer. The four-port square microlasers are fabricated by the similar technique process of the two-port square microlasers [9]. Firstly, a SiO 2 layer with thickness of 800 nm was deposited by plasma enhanced chemical-vapor deposition on the laser wafer as a hard mask for dry etching.…”

“…In addition, the equilateral-triangle and square resonator microlasers connected with an output waveguide were also fabricated [6][7][8]. Furthermore, square-resonator microlasers with two vertices connected with bus waveguides are fabricated by planar technique [9].…”

Sub‐THz wave generation based on a dual wavelength microsquare laser

“…If a dual wavelength emission is achieved in a single laser, a THz source with greatly simplified structure and stabilised operation can be realised. Whispering‐gallery mode microcavity lasers have been extensively studied so far and a square‐shaped microlaser has been demonstrated recently to exhibit single‐mode or dual‐mode lasing with well‐balanced intensity and controllable wavelength interval [10–12]. In this Letter, we propose and demonstrate THz generation using this dual wavelength microsquare laser.…”

InAlGaAs/InP cylinder microlaser connected with two waveguides

“…Furthermore, optical memory was realised by InP-based microdisk lasers vertically integrated with a silicon-on-insulator (SOI) waveguide [4], where two sides of the SOI waveguide work as input and output ports. Recently, a two-port InGaAsP/InP square resonator microlaser was reported with light emission from one cleaved port [5], and a circular microresonator was predicted to realise multiple-port directional emission based on the coupled modes [6].…”