Wavelength-tunable laser sources operating in the 2–3μm spectral range are of significant interest for applications such as gas sensing,remote sensing,and laser spectroscopy.In this work,we demonstrate a chip-scale ...Wavelength-tunable laser sources operating in the 2–3μm spectral range are of significant interest for applications such as gas sensing,remote sensing,and laser spectroscopy.In this work,we demonstrate a chip-scale hybrid laser source with a record 125 nm quasi-continuous tuning range around the 2.4μm wavelength.This is achieved by integrating a GaSb-based reflective semiconductor optical amplifier(RSOA)with a low-loss silicon photonics circuit incorporating a broadband optical filter.The filter design employs only two cascaded silicon micro-ring resonators,engineered to provide an ultra-wide free spectral range(FSR)that enables precise wavelength control and exceptional spectral purity.By dynamically tuning the micro-ring resonators and the gain chip,quasi modehop-free operation can be achieved across the entire bandwidth.The device exhibits a side-mode suppression ratio(SMSR)exceeding 60 dB and delivers 11 mW output optical powers at room temperature.To underscore its practical utility,the laser is deployed in tunable diode laser absorption spectroscopy(TDLAS)for the detection of methane in different absorption lines with picometer wavelength resolution,demonstrating its capability for broadband gas analysis.This work establishes a scalable platform for compact,high-performance short-wave mid-infrared laser systems with applications in environmental monitoring,industrial safety,and medical diagnostics.展开更多
Power scaling in conventional broad-area(BA)lasers often leads to the operation of higher-order lateral modes,resulting in a multiple-lobe far-field profile with large divergence.Here,we report an advanced sawtooth wa...Power scaling in conventional broad-area(BA)lasers often leads to the operation of higher-order lateral modes,resulting in a multiple-lobe far-field profile with large divergence.Here,we report an advanced sawtooth waveguide(ASW)structure integrated onto a wide ridge waveguide.It strategically enhances the loss difference between higher-order modes and the fundamental mode,thereby facilitating high-power narrow-beam emission.Both optical simulations and experimental results illustrate the significant increase in additional scattering loss of the higher-order modes.The optimized ASW lasers achieve an impressive output power of 1.1 W at 4.6 A at room temperature,accompanied by a minimal full width at half maximum lateral divergence angle of 4.91°.Notably,the far-field divergence is reduced from19.61° to 11.39° at the saturation current,showcasing a remarkable 42%improvement compared to conventional BA lasers.Moreover,the current dependence of divergence has been effectively improved by 38%,further confirming the consistent and effective lateral mode control capability offered by our design.展开更多
基金National Natural Science Foundation of China(62375293,62235005,62204238)Basic and Applied Basic Research Foundation of Guangdong Province(2022A1515012634,2022B1515130002)+2 种基金Chinese Academy of Sciences Project for Young Scientists in Basic Research(YSBR-112)Beijing Nova Program(20240484621)“Announce the list and take charge”of the major special plan of science and technology in Shanxi Province(202201030201009).
文摘Wavelength-tunable laser sources operating in the 2–3μm spectral range are of significant interest for applications such as gas sensing,remote sensing,and laser spectroscopy.In this work,we demonstrate a chip-scale hybrid laser source with a record 125 nm quasi-continuous tuning range around the 2.4μm wavelength.This is achieved by integrating a GaSb-based reflective semiconductor optical amplifier(RSOA)with a low-loss silicon photonics circuit incorporating a broadband optical filter.The filter design employs only two cascaded silicon micro-ring resonators,engineered to provide an ultra-wide free spectral range(FSR)that enables precise wavelength control and exceptional spectral purity.By dynamically tuning the micro-ring resonators and the gain chip,quasi modehop-free operation can be achieved across the entire bandwidth.The device exhibits a side-mode suppression ratio(SMSR)exceeding 60 dB and delivers 11 mW output optical powers at room temperature.To underscore its practical utility,the laser is deployed in tunable diode laser absorption spectroscopy(TDLAS)for the detection of methane in different absorption lines with picometer wavelength resolution,demonstrating its capability for broadband gas analysis.This work establishes a scalable platform for compact,high-performance short-wave mid-infrared laser systems with applications in environmental monitoring,industrial safety,and medical diagnostics.
基金supported by the National Natural Science Foundation of China(Grant No.62204238)the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0300801)+1 种基金‘Announce the list and take charge’of the Major Special Plan of Science and Technology in Shanxi Province(Grant No.202201030201009)the National Key R&D Program of China(Grant No.2019YFA0705203)。
文摘Power scaling in conventional broad-area(BA)lasers often leads to the operation of higher-order lateral modes,resulting in a multiple-lobe far-field profile with large divergence.Here,we report an advanced sawtooth waveguide(ASW)structure integrated onto a wide ridge waveguide.It strategically enhances the loss difference between higher-order modes and the fundamental mode,thereby facilitating high-power narrow-beam emission.Both optical simulations and experimental results illustrate the significant increase in additional scattering loss of the higher-order modes.The optimized ASW lasers achieve an impressive output power of 1.1 W at 4.6 A at room temperature,accompanied by a minimal full width at half maximum lateral divergence angle of 4.91°.Notably,the far-field divergence is reduced from19.61° to 11.39° at the saturation current,showcasing a remarkable 42%improvement compared to conventional BA lasers.Moreover,the current dependence of divergence has been effectively improved by 38%,further confirming the consistent and effective lateral mode control capability offered by our design.
