What the study found
The study found that a diode-pumped Yb:Ca3TaGa3Si2O14 laser could operate both continuously and in passively mode-locked operation. In the mode-locked regime, it produced pulses as short as 50 fs, which are femtoseconds, or one quadrillionth of a second.
Why the authors say this matters
The authors conclude that this is the first demonstration of a mode-locked laser based on the Yb:Ca3TaGa3Si2O14 langasite-type non-centrosymmetric crystal. They state that this highlights the crystal's potential as a gain medium, meaning the material that amplifies light, for sub-100 fs solid-state lasers.
What the researchers tested
The researchers tested a diode-pumped Yb:Ca3TaGa3Si2O14 laser in continuous-wave and passively mode-locked operation. They also added a quartz-based Lyot filter, which is a wavelength-selective optical filter, to measure wavelength tuning, and used a commercial semiconductor saturable absorber mirror to start and sustain pulse formation.
What worked and what didn't
In continuous-wave operation, the laser delivered a maximum output power of 408 mW at 1045.5 nm, with a slope efficiency of 58.1% and a laser efficiency of 53.4%. With the Lyot filter, it achieved an 82 nm continuous tuning range from 1007 to 1089 nm. In the mode-locked regime, it generated 50 fs pulses at 1052.4 nm with an average output power of 40 mW and a repetition rate of 73.9 MHz.
What to keep in mind
The abstract does not describe experimental limitations, comparisons with other lasers, or longer-term stability. The summary also does not provide details beyond the reported output powers, tuning range, pulse duration, and repetition rate.
Key points
- The laser operated in both continuous-wave and passively mode-locked regimes.
- The shortest reported pulses were 50 fs at a central wavelength of 1052.4 nm.
- Continuous-wave output reached 408 mW at 1045.5 nm.
- A quartz-based Lyot filter enabled 82 nm of wavelength tuning, from 1007 to 1089 nm.
- A commercial semiconductor saturable absorber mirror was used to initiate and sustain pulse shaping.
Disclosure
- Research title:
- Yb:Ca3TaGa3Si2O14 laser reached 50 fs mode-locked pulses
- Authors:
- Xiuping Li, ZhangLang Lin, Chen Yujin, Pavel Loiko, Zhen Zhang, Liangbi Su Liangbi Su, Huangjun Zeng, Bo Ma, Yidong Huang, Xavier Mateos, Valentin Petrov, Zhang Ge, Weidong Chen
- Institutions:
- Shanghai Institute of Ceramics, Shanghai Institute of Ceramics, Universitat Rovira i Virgili, Université de Caen Normandie
- Publication date:
- 2026-04-02
- DOI:
- 10.1364/oe.590978
- OpenAlex record:
- View
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