Dual-wavelength emission from a high-order Bragg gratings integrated broad-area laser diode

• Published in: Optics and laser technology 2022-06, Vol.150, p.107944, Article 107944
• Main Authors: Jia, Peng, Zhang, Jianwei, Chen, Yongyi, Liang, Lei, Qin, Li, Ning, Yongqiang, Wang, Lijun
• Format: Article
• Language: English
• Subjects: Bragg grating; Bragg gratings; Bragg reflection laser diode; Broadband; Dual-wavelength; Emission; Lasers; Semiconductor lasers; Tuning applications; Waveguides; Wavelengths
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2022.107944

•A broad-area distributed Bragg reflection laser diode with dual-wavelength emission at around 958 nm has been fabricated, which has a maximum continuous-wave power of 411 mW.•We have proved that our HOBGs laser has an intrinsic difference from other dual-wavelength lasers: The dual-wavelength emission mainly originated from the gain competition of different longitudinal modes, which were also modulated by the single period Bragg gratings.•The longitudinal mode of the broad-area laser diode can be partially filtered by the HOBGs. As the gain peak of active region can cover nearly four modes, and two modes of them with nearly the same gain value can be emitted simultaneously.•It provides a new method for mass production for two longitudinal modes emission semiconductor laser, which can be used for the multi-wavelength continuous tuning applications. This paper presents a broadband distributed Bragg reflection laser diode with dual-wavelength emission. The waveguide of the laser diode is integrated with a 95-um high-order Bragg grating (HOBG) region. Thus, the longitudinal mode of the broadband laser diode can be partially filtered by the HOBGs. As the gain peak of the active region can cover nearly four modes, two modes with nearly the same gain value can be emitted simultaneously. Moreover, two wavelengths with an interval of 0.25 nm are obtained, and the centre wavelength is near 958 nm. The maximum output power of the dual-wavelength emission can reach 411 mW at an operating current of 1.16 A. A stable dual-wavelength emission can be maintained when the operating current is changed from 1.02 A to 1.16 A. In particular, the spacing between the two wavelengths barely varies. Thus, dual-wavelength emission can be used for multi-wavelength continuous tuning applications.