A 200 MHz Compact Environmentally-Stable Mode-Locked Figure-9 Fiber Laser

A compact environmentally-stable mode-locked figure-9 fiber laser is reported in this paper. The laser cavity is composed of only two all-polarization-maintaining fiber components, which enjoys a concise and stable structure. As a result, vibration-immune stable fundamental single-pulse mode-locking operation can always be observed. The pulse repetition rate was measured to be 201.14 MHz which was much higher than the most of previous works. The output pulse was also measured to have a center wavelength/3-dB spectral bandwidth/radio frequency signal to noise ratio/pulse width of 1561.29 nm/20.97 nm/78 dB/510 fs, respectively. Besides, a temperature test in the range of 20 to 36 °C, together with a 12-h output performance test was explored. The measured evolutions of output power, repetition frequency, and spectrum showed the laser had excellent environmental stability, illustrating it as an easy-fabrication, environmentally-stable and compact ultrafast candidate for the scientific area of this kind.