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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

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A microcontroller based self-locking laser system.

P Ruksasakchai¹, C E Cowdell², L Sanchez¹

¹The Dodd-Walls Centre for Photonic and Quantum Technologies, University of Otago, Dunedin 9016, New Zealand.

The Review of Scientific Instruments

|April 30, 2022

Summary

This summary is machine-generated.

This study introduces an automated laser system that self-locks to atomic transitions without user intervention. The system ensures continuous operation by automatically detecting and re-locking if the laser drifts, enhancing experimental stability.

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Area of Science:

Atomic, Molecular, and Optical Physics
Laser Spectroscopy
Experimental Physics

Background:

Precise laser frequency control is crucial for experiments like laser cooling and atom manipulation.
Manual laser locking is time-consuming and prone to errors, limiting experimental efficiency.
Developing automated systems can significantly improve the reliability and accessibility of laser-based experiments.

Purpose of the Study:

To develop and demonstrate a self-locking laser system that automates atomic transition locking and re-locking.
To implement and test the system on different diode laser types (DBR and FP) for specific applications.
To characterize the performance and robustness of the automated locking system.

Main Methods:

Utilized frequency modulation transfer spectroscopy (FMTS) to obtain sub-Doppler spectra of rubidium-85.
Implemented signal demodulation to derive zero-crossing linear slopes for locking.
Employed an Arduino Due microcontroller for frequency modulation, signal analysis, and automated lock/re-lock control.
Tested the system on distributed Bragg reflector (DBR) and Fabry-Perot (FP) diode lasers.

Main Results:

Achieved laser linewidths of 1.4 MHz (DBR) and 5.5 MHz (FP).
Demonstrated frequency stability with drifts of a few 100 kHz over days.
Obtained wide capture ranges: 4.9 GHz (DBR) and 725 MHz (FP).
Confirmed robust performance under actual experimental conditions for laser cooling and Raman transition experiments.

Conclusions:

The developed self-locking laser system effectively automates laser frequency stabilization for atomic transitions.
The system enhances experimental reliability and reduces the need for manual operator intervention.
This automated approach is versatile and applicable to various laser systems and experimental setups, including magneto-optical traps and Raman spectroscopy.