研究目的
Investigating the fabrication and performance of high-power, high-spectral-purity GaSb-based laterally coupled distributed feedback lasers with metal gratings emitting at 2 μm.
研究成果
The study successfully demonstrated the fabrication of high-power, high-spectral-purity GaSb-based LC-DFB lasers with metal gratings emitting at 2 μm. The lasers exhibited stable single mode operation with a high SMSR and achieved a comparable output power to index-coupled LC-DFB lasers while maintaining better single mode performance. This proves the feasibility of the metal-grating LC-DFB structure for achieving high-power, frequency-stable semiconductor lasers.
研究不足
The working temperature of the device is limited by the temperature control capability of the platforms used. The actual line width of the laser is narrower than the measured 9 MHz, indicating instrumental noise limitations.
1：Experimental Design and Method Selection:
The study involved the design and fabrication of GaSb-based LC-DFB lasers with second-order Chromium-Bragg-gratings fabricated alongside the ridge waveguide by lift off. The lasers were designed to operate at 2 μm with a focus on achieving high power and spectral purity.
2：Sample Selection and Data Sources:
The laser heterostructures were grown on an N-type GaSb substrate using solid–source molecular beam epitaxy (MBE).
3：List of Experimental Equipment and Materials:
Equipment included a Thorlabs S401C calibrated thermopile detector for power measurement and a Yokogawa AQ6376 optical spectrum analyzer for emission spectra. Materials included GaSb substrates, AlGaAsSb cladding and waveguide layers, and InGaAsSb quantum wells.
4：Experimental Procedures and Operational Workflow:
The ridge-waveguide was fabricated using contact lithography and etched down to a depth of
5：65 μm. A 50 nm-thick Si3N4 layer was deposited for insulation. Second-order gratings of chromium were fabricated alongside the ridge-waveguide by lift-off and covered by another Si3N4 layer. Data Analysis Methods:
The output power and emission spectra were measured and analyzed to evaluate the performance of the lasers.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
