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In view of the special conditions of gas drainage boreholes in coal mines, an automatic monitoring system of gas drainage borehole is designed, which consists of operation control, image acquisition, image transmission, record demonstration, electricity supply and explosion protection. According to the voltage level in coal mine, a three-stage transformer with wide voltage range and stable operation...
Stabilization of the relative carrier-envelope (CE) phase for hybridly synchronized two-color fs Yb and Er fiber laser systems is demonstrated for the first time by utilizing the feedforward scheme based on an acousto-optic frequency shifter.
Simultaneous determination of both carrier-envelope offset (CEO) frequencies of passively synchronized mode-locked Yb-fiber and Er-fiber lasers has been demonstrated by measuring the heterodyne beats between the Yb-fiber laser and the self-referenced Er-fiber laser combs around 1050 nm.
Microwave and optical frequency references are simultaneously transferred through fiber using a frequency-stabilized mode-locked Er-fiber laser comb. The instability for transferred microwave and optical frequencies are 2.0times10-13 and 7.5times10-15@1 s, respectively, for 3 km transmission.
A passively mode-locked Er-fiber laser via nonlinear polarization rotation with fundamental repetition rate of 300 MHz is demonstrated. Frequency stabilization of the spectrum-broadened, octave-spanning laser comb and application to optical frequency measurement is reported.
We uniquely determine the mode number using two erbium-doped fiber laser combs operating in different repetition rates for optical frequency measurement with no dependence on the frequency fluctuation of the laser under measurement.
The carrier-envelope phase coherence time of a mode-locked erbium fiber laser was measured to be less than 4 mus outside the feedback loop. The fiber amplifier induced noise was also determined for a cascaded amplifier.
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