研究目的
Developing a wavelength tunable, pulsed laser source for laser spectroscopy of CO2 at 1572 nm to improve size, weight, and complexity over fiber-component-based implementations.
研究成果
The integrated photonic circuit implementation for a wavelength-tunable, amplitude-modulated laser system shows potential for significant improvements in volume, mass, efficiency, ruggedness, and reliability, benefiting space flight and other remote sensing applications.
研究不足
The current laser transmitter implementation is bulky and inefficient compared to an integrated photonic solution, indicating room for optimization in size, weight, and efficiency.
1：Experimental Design and Method Selection:
The study employs an integrated photonics design in indium phosphide (InP) for a tunable laser source, comparing it to a fiber-component-based implementation.
2：Sample Selection and Data Sources:
The laser source targets CO2 gas absorption at 1572 nm.
3：List of Experimental Equipment and Materials:
Includes a distributed feedback (DFB) master laser diode, phase modulator, sampled grating distributed Bragg reflector (SG-DBR) slave laser diode, Mach-Zehnder modulator (MZM), semiconductor optical amplifier (SOA), and high-speed photodiode.
4：Experimental Procedures and Operational Workflow:
The DFB frequency is stabilized to a reference CO2 gas cell using frequency modulation. The SG-DBR is stepped across the absorption line feature using an optical phase-locked loop (OPLL) offset-locking scheme.
5：Data Analysis Methods:
Performance metrics include center wavelength, pulse width, repetition rate, and optical power.
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