研究目的
Investigating the impact of sub-wavelength scale fine-delay controlled short-cavity optical feedback on the optical spectra, repetition rate, and average optical output power of a monolithic passively mode-locked semiconductor quantum-well laser.
研究成果
Wavelength-periodic signatures in emission wavelength, repetition rate, and optical output power of a passively mode-locked quantum-well laser are reported experimentally for the first time by varying the short-cavity optical feedback by fine-delay control at sub-wavelength scale.
研究不足
The study is limited to a specific type of laser and feedback conditions, and the findings may not be generalizable to other systems without further research.
1：Experimental Design and Method Selection:
The study involves a monolithic passively mode-locked semiconductor quantum-well laser subjected to ultra-short optical self-feedback with nanometric fine-delay.
2：Sample Selection and Data Sources:
The laser emits picosecond short optical pulses at 1070 nm.
3：List of Experimental Equipment and Materials:
A free-space external cavity with a macroscopic delay length ranging from 145 ps to 275 ps round-trip time and a wedged glass on a high-precision linear translation stage for nanometric precision delay.
4：Experimental Procedures and Operational Workflow:
The optical pulsed emission is studied in dependence of changing macroscopic delay length, and the nonlinear auto-correlation signals and repetition rates are measured.
5：Data Analysis Methods:
The center wavelength, repetition rate, and fraction of laser output power are recorded for each microscopic delay.
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