We present a fiber-optic extrinsic Fabry-Perot interferometer pressure sensor based on nanothick silver diaphragm. The sensing diaphragm, with thickness measured in few hundreds of nanometers, is fabricated by the electroless plating method, which provides simple fabrication process involving high-quality diaphragm at low cost. exhibits relatively linear response within variation range 0-50 kPa, high sensitivity 70.5 nm/kPa. This expected to have potential applications field highly sensitive sensors.

Coherent beam combining of 107 beams has been demonstrated for the first time to best our knowledge. When system was in closed loop, pattern far-field stable and fringe contrast <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m1"> <mml:mrow> <mml:mo form="prefix">&gt;</mml:mo> <mml:mn>96</mml:mn> <mml:mi>%</mml:mi> </mml:mrow> </mml:math> . The impact dynamic tilt error, piston power inconsistency theoretically analyzed. Meanwhile, distribution law error...

Gute Mischung: Ga2O3 mit einstellbaren α-β-Oberflächenphasengrenzen übertrifft einzelne α- oder β-Ga2O3-Oberflächenphasen bei der photokatalytischen Spaltung von Wasser in H2 und O2. Diese gesteigerte Leistung wird vor allem einer effizienten Ladungstrennung einem Ladungstransfer über die α-β-Phasengrenze zugeschrieben. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made...

We demonstrate a mode-locked all-fiber Tm laser using single mode-step index multimode-graded-index multimode-single mode fiber structure as saturable absorber based on the nonlinear multimodal interference. Stable fundamentally mode-locking operation was obtained at pump threshold of 180mW. The output soliton pulses had center wavelength, spectral width, pulse duration, and repetition rate 1888 nm, 3.6 1.4 ps, and19.82 MHz, respectively. This is simple, low-cost, stable, convenient...

Abstract An all-fiber high-power linearly polarized chirped pulse amplification (CPA) system is experimentally demonstrated. Through stretching the duration to a full width of approximately 2 ns with two cascaded fiber Bragg gratings (CFBGs), maximum average output power 612 W achieved from high-gain Yb-doped that has core diameter 20 μm slope efficiency 68% at repetition rate 80 MHz. At power, polarization degree 92.5% and M factor beam quality 1.29; slight performance degradations are...

We demonstrated a kHz-linewidth single-frequency laser at 1.95 μm using the self-developed heavily Tm(3+)-doped single-mode germanate glass fiber with net gain coefficient of 2.3 dB per centimeter. The maximum output power stable single longitudinal mode continuous wave is over 200 mW. slope efficiency measured versus absorbed pump 34.8%, signal-to-noise ratio higher than 68 and linewidth less 7 kHz. A wavelength-tuning from 1949.55 to 1951.23 nm was also based on changing tension Bragg...

We present a low noise single-frequency and single-polarization distributed Bragg reflector fiber laser at 1083 nm by using 1.8 cm long newly developed ytterbium-doped phosphate single mode glass fiber. The maximum output power is more than 100 mW with slope efficiency of >29.6%. signal to ratio higher 61 dB the linewidth less 2 kHz estimated. obtained relative intensity for frequencies over 4.0 MHz -150 dB/Hz, which approaches shot limit. achieved linear polarization extinction 30 dB.

In this paper, we report a high power single frequency 1030 nm fiber laser with near-diffraction-limited beam quality based on polarization-maintaining tapered Yb-doped (T-YDF). The T-YDF has advantages of effectively suppressing stimulated Brillouin scattering (SBS) while maintaining good quality. As result, record output 379 W frequency, linearly polarized, nearly single-mode amplifier operating at is demonstrated. polarization extinction ratio as 16.3 dB, and the M2 measured to be 1.12....

We report on the dissipative soliton generation in a 1.7-μm net-normal dispersion Tm-doped fiber laser by nonlinear polarization rotation technique. An intra-cavity bandpass filter was employed to suppress long-wavelength emission, while cavity compensated segment of ultrahigh numerical aperture (UHNA4) fiber. The with central wavelength 1746 nm obtained, covering spectral range from 1737 1754 nm. de-chirped duration and energy were 370 fs 0.2 nJ, respectively. In addition, dynamics multiple...

An all-optical frequency and intensity noise suppression technique of a single-frequency fiber laser is demonstrated. By exploiting the recursive reduction effect semiconductor optical amplifier (SOA) in self-injection locked laser, are remarkably suppressed significantly wide range. In addition to linewidth from 3.5 kHz 700 Hz, has been reduced by ∼25 dB. After suppression, relative (RIN) within 5 dB shot limit at frequencies 1.5 3 MHz, range reaches about 30 MHz. The relaxation oscillation...

A significant broad-bandwidth near-shot-noise-limited intensity noise suppression of a single-frequency fiber laser is demonstrated based on semiconductor optical amplifier (SOA) with optoelectronic feedback. By exploiting the gain saturation effect SOA and feedback loop, maximum over 50 dB around relaxation oscillation frequencies bandwidth up to MHz are obtained. The relative -150 dB/Hz in frequency range from 0.8 kHz achieved, which approaches shot-noise limit. obtained signal-to-noise...

Based on a temperature-dependent longitudinal-mode-selection model, broad temperature range for single-longitudinal-mode (SLM) operation of short DBR phosphate fiber laser has been demonstrated. In order to make the variety in cavity resonance wavelength match reflection peak changing Bragg grating (FBG) when ambient changes, packaging materials with different coefficient linear expansion are used active and FBG, respectively. The variation without mode hopping SLM increased from about 2 °C...

The solution microstructure during the ferric sulfate-assisted precipitation of calcium fluoride were systematically investigated using molecular dynamics simulations and DFT methods. microscopic behavior various ions in box presence sulfate was simulated by MD. corresponding hydrated cluster structures extracted from MD trajectory, followed structure optimization frequency calculation at B3LYP/6-311++G(d, p) level. results showed that all clusters had no virtual frequencies. Through...

The solution microstructure during the ferric sulfate-assisted precipitation of calcium fluoride was systematically investigated using molecular dynamics simulations and DFT methods. microscopic behavior various ions in a box presence sulfate simulated MD. corresponding hydrated cluster structures were extracted from MD trajectory; then, structure optimized frequency calculated at B3LYP/6–311++G(d, p) level. results show that no clusters had imaginary frequencies. Based on topology,...

A kHz-order linewidth controllable 1550 nm single-frequency fiber laser (SFFL) is demonstrated for the first time to our best knowledge. The control of realized by using a low-pass filtered white Gaussian noise (WGN) signal applied on stretcher in an optical feedback loop. Utilizing WGN signals with different amplitudes An and cutoff frequencies fc, linewidths are availably controlled wide range from 0.8 353 kHz. obtained signal-to-noise ratio (OSNR) more than 72.0 dB, relative intensity...

Exploiting the promising third near-infrared optical window (1600–1870 nm) for deep bioimaging is largely underdeveloped, mostly because of lack stable femtosecond laser sources in leveraging less scattering loss and locally reduced water absorption. In this letter, we demonstrate fiber chirped pulse amplification a short wavelength mode-locked thulium-doped (TDFL) at 1785 nm. The TDFL (via nonlinear polarization rotation) operates stably soliton pulsing regime with fundamental repetition...

Linewidth suppression mechanism of the self-injection locked single-frequency fiber laser (SFFL) is investigated theoretically and experimentally. An analytical model based on semi-phenomenological approach built up to characterize optical feedback in SFFL. According theoretical prediction, linewidth tends be reduced with longer external cavity photon lifetime. Experimentally, a 200-Hz SFFL achieved 101 m long delay fiber, which agrees well simulation. The provides new perspective understand...

We demonstrated an all-fiber multiwavelength mode-locking thulium-doped fiber laser employing a cascaded single-mode step-index multimode-graded-index multimode single-mode-fiber (SMF-SIMF-GIMF-SMF) saturable absorber (SA). Based on the linear and nonlinear interference effect of proposed device, this structure can act both as filter SA. A stable triwavelength (1857/1897/1934 nm) operation with adjacent wavelength interval approximately 40 nm was obtained. The mode locking also be quickly...