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Related Experiment Video

Updated: Jun 20, 2026

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Frequency-doubled, additive-pulse, mode-locked NaCl:OH(-)laser.

C P Yakymyshyn, C R Pollock

|September 16, 2009

Summary

Researchers frequency-doubled tunable laser pulses using a lithium iodate crystal. This technique achieved stable, ultrashort pulses at 0.8 micrometers, enhancing laser technology for various applications.

Area of Science:

Optics and Photonics
Laser Physics
Nonlinear Optics

Background:

Tunable, additive-pulse, mode-locked lasers are crucial for generating ultrashort optical pulses.
Frequency doubling is a key nonlinear optical process for accessing shorter wavelengths.
Sodium chloride (NaCl) color-center lasers doped with hydroxyl (OH-) offer tunable output in the infrared region.

Purpose of the Study:

To frequency double the output of a tunable, additive-pulse, mode-locked NaCl:OH(-) color-center laser.
To investigate the characteristics of the frequency-doubled ultrashort pulses.
To assess the tunability and power of the generated second-harmonic pulses.

Main Methods:

Utilized a lithium iodate (LiIO(3)) crystal for second-harmonic generation.

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Employed a tunable, additive-pulse, mode-locked NaCl:OH(-) color-center laser as the fundamental light source.

Characterized the output pulses in terms of duration, average power, and wavelength tunability.

Main Results:

Achieved stable frequency-doubled pulses with durations as short as 76 femtoseconds (fsec).
Obtained an average output power exceeding 5 milliwatts (mW) at 0.8 micrometers.
Demonstrated tunability of the frequency-doubled pulses over the range of 755 to 825 nanometers (nm).

Conclusions:

Successful frequency doubling of a mode-locked NaCl:OH(-) laser output was demonstrated.
The method provides a reliable way to generate ultrashort, tunable pulses in the visible spectrum.
This technique has potential applications in spectroscopy, optical communications, and fundamental research.