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Related Experiment Video

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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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Frequency-doubled FDML-MOPA laser in the visible.

Sebastian Karpf, Bahram Jalali

|July 7, 2020

Summary

Researchers developed a visible wavelength-swept laser for high-speed imaging and spectroscopy. This pulsed laser, based on Fourier domain mode-locked (FDML) technology, achieves high peak powers for advanced applications.

Area of Science:

Optics and Photonics
Laser Technology
Spectroscopy

Background:

Wavelength-swept lasers are crucial for high-speed optical measurements, including optical coherence tomography and microscopy.
Previous work introduced a pulsed wavelength-swept laser using Fourier domain mode-locking (FDML) and a master-oscillator power amplifier (MOPA) architecture, achieving high peak powers.

Purpose of the Study:

To extend the capabilities of the pulsed wavelength-swept laser into the visible spectrum.
To develop a high-repetition-rate, visible wavelength-swept laser source for new research applications.

Main Methods:

Frequency doubling the output of a 1064 nm pulsed laser to 532 nm using a deuterated potassium dihydrogen phosphate (DKDP) crystal.
Utilizing second harmonic generation (SHG) for wavelength conversion.

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Main Results:

Successfully generated a wavelength-swept laser source operating in the visible range (around 532 nm).
The laser outputs a pulse train at an 88 MHz pulse repetition rate and a 342 kHz sweep repetition rate.
Achieved distinct, almost monochromatic wavelengths within the swept output.

Conclusions:

The developed visible wavelength-swept laser is a novel tool for advancing research in spectroscopy, metrology, sensing, and high-speed imaging.
This technology opens new avenues for applications requiring high-speed visible light sources.