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Diode-pumped mode-locked Yb:YCOB laser generating 35 fs pulses
Akira Yoshida1, Andreas Schmidt, Valentin Petrov
1Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Berlin, Germany.
Optics Letters
|November 18, 2011
Summary
Researchers achieved direct sub-50-femtosecond (fs) pulse generation using a Yb:YCa4O(BO3)3 laser. Further compression yielded pulses as short as 35 fs, advancing ultrafast laser technology.
Area of Science:
- Laser Physics
- Ultrafast Optics
Background:
- Mode-locked lasers are crucial for generating ultrashort optical pulses.
- Achieving femtosecond pulse durations requires advanced laser designs and techniques.
Purpose of the Study:
- To demonstrate direct sub-50-femtosecond (fs) pulse generation from a Yb:YCa4O(BO3)3 laser.
- To investigate the potential for generating even shorter pulses through external compression.
Main Methods:
- Utilizing a mode-locked Yb:YCa4O(BO3)3 laser oscillator.
- Employing a semiconductor saturable absorber mirror for mode-locking.
- Pumping the laser with a two-section distributed Bragg reflector tapered diode laser.
- Implementing external pulse compression techniques.
Main Results:
- Direct generation of sub-50-fs pulses was achieved.
- External compression resulted in pulses as short as 35 fs at a wavelength of 1055 nm.
- The laser operated at a repetition rate of 95 MHz.
- Self-Raman-conversion was observed for spectral bandwidths exceeding 40 nm (FWHM).
Conclusions:
- The Yb:YCa4O(BO3)3 laser system is capable of producing ultrashort femtosecond pulses.
- External compression is an effective method for further reducing pulse duration.
- The observed self-Raman-conversion indicates the spectral broadening capabilities of the generated pulses.
