Ultra-low intensity noise, all fiber 365 W linearly polarized single frequency laser at 1064 nm

Abstract

We demonstrate a robust linearly polarized 365 W, very low amplitude noise, single frequency master oscillator power amplifier at 1064 nm. Power scaling was done through a custom large mode area fiber with a mode field diameter of 30 µm. No evidence of stimulated Brillouin scattering or modal instabilities are observed. The relative intensity noise is reduced down to −160 dBc/Hz between 2 kHz and 10 kHz via a wide band servo loop (1 MHz bandwidth). We achieve 350 W of isolated power, with a power stability < 0.7% RMS over 1100 hours of continuous operation and a near diffraction limited beam (M 2 < 1.1).

Single-Frequency 336 W Spliceless All-Fiber Amplifier Based on a Chirally-Coupled-Core Fiber for the Next Generation of Gravitational Wave Detectors

“…Jauregui et al estimated a parameter of thermal load to the onset of TMI of around 34 W/m applicable to specific fiber geometries [32]. The presented results of the 3C ® -fiber amplifier regarding to the pump to signal efficiency of ∼80% in section III-A and the absolute efficiency are comparable to other fiber amplifier systems [9], [10]. With the estimated unabsorbed pump power of ∼20 W, additional pump light losses in the pump combiner housing of ∼8% and remaining pump light in the intermediate fibers of the pump combiner, the thermal load of the 3C ® -fiber was <33 W/m.…”

“…However, this excess noise is typically more broadband and not limited locally to the 5MHz range. According to Dixneuf et al [10], the slightly increased intensity noise could be also attributed to the impact of residual cladding modes. This question can only be answered by future further power scaling experiments.…”

“…In this regard, Wellmann et al achieved recently 200 W in an engineering all-fiber system [9]. Additionally, Dixneuf et al demonstrated 365 W of low noise optical power [10]. Scaling single-frequency fiber laser sources to power levels sought by GWD is hampered primarily by stimulated Brillouin scattering (SBS).…”

Over 100 mW Stable Low-Noise Single-Frequency Ring-Cavity Fiber Laser Based on a Saturable Absorber of Bi/Er/Yb Co-Doped Silica Fiber

“…To meet the increasingly potential applications, the performance of ~1.0 μm SFFLs, i.e., linewidth, maximum output power, and stability, needs to be further improved. These parameters are the key indicators determining the resolution, sensitivity and stability of the system used for optical detection, sensing, and imaging [5][6][7]. Various cavity schemes have been proposed to generate single-Manuscript received XXX XX, 2021; revised XXX XX, 2021; accepted XXX XX, 2021.…”

Study on the simulation of YDFA and reabsorption effect

“…Because of the special two-level structure of Yb 3+ , the Yb-doped fiber laser is especially suitable as the high-power laser [1][2][3][4] , but the seed signal tends to have a reabsorption effect in the process of fiber transmission, which leads to the phenomenon that the seed power first increases and then decreases with the increase of fiber length, and this phenomenon is more likely to appear in the short wavelength band. Generally speaking, the reabsorption phenomenon of fiber is caused by the characteristics of Yb 3+ itself, and the output wavelength of classic YDFA is usually between 1020 and 1100 nm 5 .…”