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We present a fiber-optic microphone (FOM) based on graphene oxide (GO) membrane in this study. A Fabry–Perot cavity consisting of a single-mode fiber and a piece of GO membrane works as the acoustic sensing structure. Using the GO as the core acoustic sensing component, the fabricating process of the FOM is demonstrated to be simple and efficient. Acoustic tests show that this FOM achieves an average...
We demonstrate an astro-comb for relatively low resolution astronomical spectrographs. The space of comb lines is Altered to 30 GHz by a Fabry-Perot cavity spaced by an ULE glass. The radial velocity precision is <40 cm/s.
The advanced laser technology has led to gigahertz level repetition rate femtosecond fiber laser possible. This laser offers advantages of high average power, chirp-free output pulses and helps the frequency comb made compact and simplified.
We tailor the lasing modes in the vertical cavity surface-emitting laser into a crescent wave using a surface elliptical ring. The crescent wave was observed to be localized at the semi-major axis of elliptical ring.
We demonstrate the first 1 GHz fundamental repetition rate ring cavity ytterbium doped fiber laser. The laser delivers 600 mW, 64fs near transform-limited pulses and supports direct octave-spanning spectrum generation.
We report a compact Yb:fiber ring laser operated at 616 MHz. The average output power is 450 mW at a pump power of 900 mW. The dechirped pulse width is 98 fs.
This article describes a manufacturing method of embedded cavity using zirconia casting-belt and multi-layer lamination technology for the high temperature ceramics, as the present high temperature ceramics are difficult to form a sealed cavity and encapsulation is complicated. Complete the preparation of high temperature ceramics sealed cavity, by using punching machines to punch out the cavity in...
We demonstrate sub-50 fs pulses generation directly from a 750 MHz repetition rate dispersion managed Yb: fiber ring laser by precision compensation of the intracavity dispersion.
Partial discharge diagnosis technology may offer valuable information on the dielectric defect, such as type of failure, and influence of service life cycle of power equipment. The main measuring methods of on-line partial discharge instrument are detection the characteristics of electric transient signal, radio signal of electromagnetic emissions, chemical component deformation, vibration, sound,...
We demonstrate high repetition rate (up to 225 MHz) all-normal dispersion Yb:fiber ring laser. The average output power is 280 mW at a pump power of 6 00 mW. The dechirped pulse is 93 fs.
The impact energy of the traditional hydraulic impactor can be regulated manually between the second and the third grade, and its impact frequency can not be adjusted independently. Also, they have to stop working for adjustment. In order to alter this situation, a new hydraulic impactor DBS500, which controlled by micro-electronic system, has been designed and its functions are showed as following:...
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