研究目的
Investigating the performance of a prism-based self-injection locked tunable blue InGaN/GaN laser diode composite cavity system with enhanced wavelength tuning range.
研究成果
The study demonstrates a continuously tunable 450 nm blue InGaN/GaN laser diode external cavity system with a prism and self-injection locking scheme, achieving a significant enhancement in the wavelength-tuning window. Both HRS and LRS configurations exhibit high stability and potential for deployment in various applications due to their robustness, simplicity, and cost-effectiveness.
研究不足
The study notes difficulty in self-injection locking of the laser diode modes at high injection currents due to increased mode competition. The tuning window decreases with increasing current injection and temperature. Performance parameters such as linewidth and SMSR fluctuate across the tuning range, indicating potential areas for optimization.
1：Experimental Design and Method Selection:
The study employs a prism-based self-injection locked tunable blue InGaN/GaN laser diode composite cavity system. Two configurations, high reflection system (HRS) and low reflection system (LRS), are analyzed at different optical feedback powers.
2：Sample Selection and Data Sources:
A high power TO-can blue Fabry Perot (FP) laser diode emitting at ~450 nm is used. The systems are evaluated at different injection currents, temperatures, and external cavity lengths.
3：List of Experimental Equipment and Materials:
Equipment includes a pellicle beam splitter, aspheric lens, equilateral dispersive prism, highly reflective mirror, kinematic mount, translation stage, optical fiber, optical spectrum analyzer, and temperature-controlled mount.
4：Experimental Procedures and Operational Workflow:
The laser beam is collimated and passed through a prism towards a reflective mirror. The reflected beam is feedback into the laser active region. The external cavity length is tuned for self-injection locking and wavelength tuning. The usable optical power is coupled into an optical fiber for analysis.
5：Data Analysis Methods:
Performance is evaluated in terms of wavelength tuning range, optical linewidth, side-mode-suppression-ratio (SMSR), and usable power. The systems' stability is also assessed over time.
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kinematic mount
KM100
Thorlabs
To hold the mirror and allow for tuning of the external cavity length.
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optical spectrum analyzer
AQ6373B
Yokogawa
To analyze the optical spectrum of the laser output.
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temperature-controlled mount
TCLDM9
Thorlabs
To control the temperature of the laser diode.
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pellicle beam splitter
BP107
Thorlabs
To extract the usable optical power from the system.
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aspheric lens
A110TM-A
Thorlabs
To collimate the laser beam.
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equilateral dispersive prism
PS858
Thorlabs
To assist in the effortless tuning of the external cavity.
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highly reflective mirror
PF10-03-P01
Thorlabs
To reflect the laser beam back into the laser active region.
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translation stage
Thorlabs
To adjust the position of the mirror for tuning.
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