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. 2014 May 30;4:5134. doi: 10.1038/srep05134

Figure 1. Design of an all-fibre femtosecond laser oscillator (FSO) for space operation.

Figure 1

(a), Artistic image presenting harsh environment factors in outer space (drawn by Y.-S. J. and S.-H.L.); 10-g launching acceleration, 60-K temperature variation and 4.80-krad total ionization dose over a year. (b), Overall hardware configuration of FSO. EDF: erbium-doped fibre, PZT: piezo-electric actuator, WDM: wavelength division multiplexer, I: isolator, OC: output coupler, C: coupler, DL: delay line, DCF: dispersion compensating fibre, PD: photo detector, LD: laser diode, DAC: digital-to-analog converter, ADC: analog-to-digital converter, MCU: micro-controller unit, FPGA: field programmable gate array, LPF: low-pass filer and CLK: clock. (c), Ground test results on the pulse duration, RF pulse train, optical spectrum, and frequency instability of the repetition rate.