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SWCNT-SA mode-locked Tm,Ho:LCLNGG laser.

Zhongben Pan, Li Wang, Ji Eun Bae

|November 23, 2021

Summary

Researchers achieved ultrashort laser pulses below 100 femtoseconds using a novel Tm,Ho-codoped garnet laser. This breakthrough in ultrafast laser technology utilized a carbon nanotube saturable absorber for stable soliton mode-locking.

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Area of Science:

Optics and Photonics
Laser Physics
Materials Science

Background:

Passively mode-locked lasers are crucial for generating ultrashort optical pulses.
Thulium and Holmium (Tm,Ho) codoped lasers operating around 2 µm are of interest for various applications.
Developing new gain media and mode-locking techniques is essential for advancing ultrafast laser technology.

Purpose of the Study:

To demonstrate sub-100 femtosecond pulse generation from a Tm,Ho-codoped cubic multicomponent disordered garnet laser.
To investigate the performance of a single-walled carbon nanotube saturable absorber in this laser system.
To report the first mode-locked operation of the Tm,Ho:LCLNGG crystal.

Main Methods:

Passive mode-locking using a single-walled carbon nanotube saturable absorber.
Utilizing a Tm,Ho-codoped lanthanum calcium lithium niobium gallium garnet (Tm,Ho:LCLNGG) crystal as the gain medium.
Characterization of output pulses including duration, central wavelength, average power, and repetition rate.

Main Results:

Achieved pulse durations as short as 63 fs at a central wavelength of 2072.7 nm.
Obtained an average output power of 63 mW at a pulse repetition rate of approximately 102.5 MHz.
Demonstrated higher average output power of 121 mW (96 fs pulse duration) with increased output coupling.

Conclusions:

The Tm,Ho:LCLNGG laser is capable of generating ultrashort pulses below 100 fs.
Single-walled carbon nanotube saturable absorbers are effective for initiating and stabilizing soliton mode-locking in this laser system.
This work represents the first demonstration of mode-locked operation for the Tm,Ho:LCLNGG crystal, opening new avenues for 2 µm ultrafast laser development.