We present a hundred-watt-level linearly-polarized random fiber laser (RFL) pumped by incoherent broadband amplified spontaneous emission (ASE) source and prospect the power scaling potential theoretically.The RFL employs half-opened cavity structure which is composed section of 330 m polarization maintained (PM) passive two PM high reflectivity Bragg gratings.The 2 nd order Stokes light centered at 1178 nm reaches pump limited maximal 100.7 W with full width half-maximum linewidth 2.58...

We demonstrate a random distributed feedback fiber laser at 2.1 μm. A high-power pulsed Tm-doped operating 1.94 μm with temporal duty ratio of 30% was employed as pump to increase the equivalent incident power. piece 150 m highly GeO2-doped silica that provides strong Raman gain and feedbacks used act medium. The maximum output power reached 0.5 W optical efficiency 9%, which could be further improved by more optimized length. To best our knowledge, this is first demonstration 2 band based on gain.

In this paper, we proposed a temperature modulation technique for the suppression of stimulated Brillouin scattering (SBS). This can achieve different kinds distributions in high-power laser system with compact design and safe operation. We built up an experiment platform theoretical model to evaluate performance by applying along gain fiber. A total 3.3 dB SBS be achieved only 70 °C gradient at 36 W output power experiment. During experiment, optical frequency domain reflectometry (OFDR)...

Abstract In this manuscript, we studied the thermal properties of hundred-watt fiber laser oscillator by real-time in-situ distributed temperature measurement. Optical frequency domain reflectometry (OFDR) was introduced to measure distribution gain core. The operated at 1080 nm and wavelength detecting signal from OFDR ~1550 nm. maximum output power 100 W. core distributions in experiment agree well with our theoretical simulation. measurement has always been a problem because backward may...

We demonstrate a linearly polarized random distributed feedback Raman fiber laser with record 86.3 W output power piece of 157 m long polarization maintaining (PM) fiber. The maximum optical efficiency first-order-Stocks light at 1120 nm reaches ~74% while pumping 1070 nm. full width half (FWHM) is ~2 and the extinction ratio (PER) measured to be as high 22 dB. To best our knowledge, this highest for linearly-polarized laser.

High-power fiber lasers have been widely used in various industrial manufacturing and military defense applications. During the development of past decades, thermal effect has always one biggest obstacles. It is crucial to study temperature characteristics overcome restrictions for a better output performance. With systematic design optimization this article, optical frequency domain reflectometry (OFDR) can achieve situ distributed measurement core high-power lasers. This allows effects....

Abstract We demonstrated a high-power continuous-wave (CW) dual-wavelength Ho-doped fiber laser (HDFL) at 2049 nm and 2153 with simple coupled-cavity configuration. A ~100 W diode-pumped 1150 served as the pump source. The maximum output power reached ~22.3 slope efficiency was 23%. By altering incident power, ratio of two signal wavelengths could be tuned in large range due to gain competition. As far we know, this is first CW HDFL exceeding ten-watt-level, central 2.0 μm 2.15 respectively.

Abstract Understanding the laser-induced thermal damage mechanism is important to development of high power continuous wave (CW) laser. In this paper, we monitor evolution via a self-build optical element testing platform and build correspond theoretical model based on temperature field heat conduction theory. The waveband coatings (ZnSe YbF 3 ) under test dedicated for mid-infrared. Using 10 kW level mid-infrared CW laser, stress process caused by surface contaminants recorded. Finite...

In this paper, we demonstrate a high power and high-order random Raman fiber laser based on 1 km novel tapered (TF). The core diameter of the TF gradually increases from 8 μm to 20 μm. highest output amounts 16.4, 35.4, 40.1 W for first (1120 nm), second (1173 third (1237 nm) order Stokes waves, respectively. spectrum gets broader with increasing pump power. full width at half maximum (FWHM) first, second, third-order waves 1.2, 1.5, 3.7 nm. contrast two in half-open cavity, wave is...

To study the thermal damage process of optical film induced by continuous wave lasers, a model with contaminants on surface is established. Based temperature field theory and heat conduction theory, we apply finite element method (FEM) to calculate films. The results show that play an important role in film. Finally, compare calculated our experimental data, agreement record.

In order to study the damage characteristic of contaminated resonating mirror in high power continuous wave (cw) laser system, we established a theoretical model based on optical transmission theory with gain medium. The propagation cavity is calculated utilizing Fast Fourier Transform (FFT) repeatedly until convergence calculations tend steady-state oscillation mode pattern. influence contaminant size, number and structure studied model.

The thermal stress damage of optical elements always restrict the development high power laser system. We studied mechanism with contaminants induced by continuous wave (CW) lasers. An experiment was carried out a self-build element testing platform and model based on temperature field theory thermodynamic set up. recorded process 10 kW/cm² level mid-infrared laser. Then we calculated elements. results are in agreement our experimental record. showed success modeling calculation...

In this paper, we study the temperature characteristic of a gain fiber core in distributed side-coupled cladding-pumped (DSCCP) amplifiers by optical frequency domain reflectometry (OFDR). To best our knowledge, is first distribution measurement DSCCP lasers. The distributions are also firstly measured among forward, backward, and bidirectional pump schemes. addition, scheme has lower than unidirectional experimental according with numerical simulation, which was once introduced for...

As heat sources in the fiber laser system, fusion points are among most vulnerable parts high power lasers (HPFLs). A model is built to evaluate induced by splices quantitatively. By introducing splice thermogenic factor (STF), temperature of a point obtained at different output powers. At same time, real-time in-situ measurement experiment carried out, and actual STF value 0.449 ppm fitting parameters with experimental results. The results indicate that can characteristics quantitatively...

We present a high power linearly-polarized high-order random fiber laser (RFL) centered at 1178 nm pumped by incoherent broadband amplified spontaneous emission (ASE) source, which delivers record (100.7 W) up to now. Furthermore, this powerful RFL also obtains the highest quantum efficiency (86.43 %) for 2nd order Stokes light. Thanks intrinsic temporal stability of explored ASE pumping ultra-stable light can be generated even ultimate operating power.

In order to study the scaling laws of optical components, we set up a model based on heat conduction theory and thermodynamic theory. Then similarity was used analyzation. Finally, demonstrate three conclusions which are related practical engineering application. The first one is that thermal damage behaviors different scale components similar when linear power density irradiated laser same. other words, should use represent resistance tolerance for second judgement standard scram time. We...

As heat sources in the fiber laser system, fusion points are among most vulnerable parts high power lasers (HPFLs). A model is built to evaluate induced by splices quantitatively. By introducing splice thermogentic factor (STF), temperature of a point obtained at different output powers. At same time, real-time in-situ measurement experiment carried out, and actual STF value 0.449 ppm fitting parameters with experimental results. The results indicate that can characteristics quantitatively...

The low-temperature properties of the ytterbium-doped fiber laser is quite important in various applications. A operating at 1018nm fabricated and its gain cooled to -30℃ by temperature control system enabled on thermoelectric coolers, which more efficient than water-cooling system. core obtained experiment a in-situ measurement based optical frequency domain reflectometry. Experimental results show that output power decreases about 5.7% while adjusted from 20℃ -30℃. Meanwhile, central...