研究目的
To enhance the mode-hop-free synchronous tuning characteristics of an external-cavity diode laser by dynamic mode matching of internal and external cavities.
研究成果
The dynamic mode matching method using an LRC filter significantly improved the MHF tuning range of the ECDL at high-frequency tuning, achieving a maximum wavelength tuning rate of 6.21 THz/s at 30 Hz. This approach is cost-effective and does not require complex control circuitry.
研究不足
The method's effectiveness is limited to the ascent stage of triangular wave tuning due to nonlinearities in the internal and external cavities. Future work could explore compensating these nonlinearities for MHF tuning in the whole tuning process.
1：Experimental Design and Method Selection:
The study involved designing an ECDL with a Littman external-cavity configuration and implementing a dynamic mode matching method using an LRC filter to control the internal-cavity mode.
2：Sample Selection and Data Sources:
A commercially available LD with a center wavelength of 785 nm was used. The optical frequency and output power were measured using a wavemeter and a photodiode detector, respectively.
3：List of Experimental Equipment and Materials:
Equipment included a Thorlabs L785P090 LD, a diffraction grating, a right angle prism, a PZT, a thermoelectric cooler, and a thermal resistor.
4：Experimental Procedures and Operational Workflow:
The ECDL was tuned by applying a voltage to the PZT, with the LD temperature stabilized and injection current set. The LRC filter was used to adjust the LD injection current for dynamic mode matching.
5：Data Analysis Methods:
The response of the ECDL to the LRC filter was analyzed to determine the improvement in MHF tuning range and wavelength tuning rate.
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LT230P-B
LT230P-B
Thorlabs
Fixes the LD and collimating lens
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PS910H-B
PS910H-B
Thorlabs
Right angle prism for the external-cavity
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43775
43775
Edmund
Diffraction grating for the external-cavity
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SA210-5B
SA210-5B
Thorlabs
Confocal scanning Fabry–Perot interferometer
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MDT694B
MDT694B
Thorlabs
Controls the PZT driving voltage
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AFG3052C
AFG3052C
Tektronix
Generates triangular wave driving signals
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capaNCDT6500
capaNCDT6500
Micro-Epsilon
Measures the dynamic response of the external-cavity system
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L785P090
L785P090
Thorlabs
Light source for the ECDL
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AE0505D16F
AE0505D16F
Thorlabs
Drives the prism in the external-cavity system
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TEC1.4-6
TEC1.4-6
Thorlabs
Stabilizes the LD temperature
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H10K
H10K
Thorlabs
Monitors the LD temperature
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Bristol 621A
621A
Bristol
Measures the optical frequency of the ECDL
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PXIe-5105
PXIe-5105
National Instruments
Acquires displacement response signal, PD voltage signal, and FPI signal
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