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190-fs passively mode-locked thulium fiber laser with a low threshold
Optics Letters
|October 31, 2009
Summary
A novel thulium-doped fiber laser generates ultrashort 190-fs pulses. This compact, self-starting laser operates at 1.9 micrometers with low power requirements.
Area of Science:
- Photonics and Optics
- Laser Physics
- Materials Science
Background:
- Thulium-doped fiber lasers are crucial for generating light in the 2-micrometer wavelength range.
- Developing compact, efficient, and stable ultrashort pulse fiber lasers remains an active research area.
Purpose of the Study:
- To demonstrate a self-starting, passively mode-locked thulium-doped silica fiber laser.
- To achieve ultrashort pulse generation with high stability and low power consumption.
Main Methods:
- Utilized a thulium-doped silica fiber as the gain medium.
- Employed passive mode-locking techniques.
- Characterized pulse duration, energy, repetition rate, and wavelength.
Main Results:
- Achieved self-starting passive mode-locking.
- Generated pulses with a duration of 190 femtoseconds (fs).
- Observed a pulse repetition rate of 50 MHz and pulse energy of 20 picojoules (pJ) at 1.9 micrometers.
Conclusions:
- The developed thulium-doped fiber laser is a practical and compact source of ultrashort pulses.
- The laser exhibits a low pump power threshold (18 mW) and operates efficiently with a 50-mW diode laser.
- This laser system holds potential for applications requiring stable, low-energy ultrashort pulses in the 1.9-micrometer range.
