In past decades, multi-wavelength lasers have attracted much attention due to their wide applications in many fields. this paper, we demonstrate a random fiber laser with customizable spectra enabled by an acousto–optic tunable filter. The operating wavelength range can be tuned from 1114.5 1132.5 nm maximal output power of 5.55 W, and spectral channel tuning also realized number five. effect gain competition the interaction between Raman insertion loss are analyzed. Furthermore, ordered...

Abstract Development of a high power fiber laser at special waveband, which is difficult to achieve by conventional rare-earth-doped fibers, significant challenge. One the most common methods for achieving lasing wavelength Raman conversion. Phosphorus-doped (PDF), due phosphorus-related large frequency shift peak 40 THz, great choice Here, adopting 150 m mode area triple-clad PDF as gain medium, and novel wavelength-selective feedback mechanism suppress silica-related emission, we build...

Low-coherence tunable visible light sources have a wide range of applications in imaging, spectroscopy, medicine, and so on. Second harmonic generation (SHG) based on superfluorescent fiber source (SFS) can produce high-brightness while retaining most the characteristics sources, such as low coherence, intensity noise flexible tunability. However, due to limitations phase matching conditions, SHG SFS is difficult reach an equilibrium between high efficiency robustness temperature variation....

A spectral programmable, continuous-wave mid-infrared (MIR) optical parametric oscillator (OPO), enabled by a self-developed high-power tailorable fiber laser, was proposed and realized. While operating at single-wavelength, the maximum idler power reached 5.53 W 3028 nm, with corresponding pump-to-idler conversion efficiency of 14.7%. The wavelength number switchable output available from one to three. single tunable in range 528 nm (2852–3380 nm). In dual-wavelength operation, interval...

Multi-wavelength fiber lasers with special spectral reconfigurable and polarization characteristic are widely applied in nonlinear frequency conversion, spectroscopy, sensing. In this manuscript, we demonstrate a hundred-watt-level, linearly polarized multi-wavelength oscillator wavelength, interval intensity tunability. A watt-level acoustic-optic tunable filter is adopted ring cavity to realize wavelength selection. Maximum output power up 90.0 W has been achieved average extinction ratio...

High-power operation is one of the most important research topics surrounding random fiber lasers (RDFLs). Here we optimized cavity structure and proposed a new scheme based on hybrid gain to address issue high-power backward light in traditional kilowatt-level RDFLs. Consequently, record power 1972 W was achieved while maximum leaked only reached 0.12 W. The conversion efficiency relative laser diode pump 68.4%, highest spectral purity lasing 98.1%. This work may provide reference for...

In recent years, multi-wavelength lasers have attracted much attention due to their wide applications in various fields. this Letter, we experimentally demonstrate a high-power Yb-doped fiber laser with the aid of an acoustic-optic tunable filter, which wavelength interval, intensity each channel, and number lasing channels can be tuned independently. As result, operating tuning range covers 1040.0 1090.0 nm maximal output power reaches 15.7 W, is higher than previous reports by more three...

In a fiber supercontinuum (SC) source, the Raman scattering effect plays significant role in extending spectrum into longer wavelength. Here, by using phosphorus-doped with broad gain as nonlinear medium, we demonstrate flat SC generation spanning from 850 to 2150 nm. Within wavelength range of 1.1–2.0 µm, spectral power density fluctuation is less than 7 dB. Compared similar source based on germanium-doped narrower spectrum, span 300 nm broader, and 5 dB lower. This work demonstrates...

One issue with speckle-based reconstructive spectrometer (RS) is the reduced accuracy of computing output when measuring broadband signals. In this manuscript, we improve reconstruction RS by leveraging polarization transmission matrix (PTM). Unlike previous works that solely utilize speckle intensity at end multimode fiber facet, incorporate complete information for higher-quality spectral recovery. By optimizing independent spatial channels, output–input ratio, and contrast, PTM enables to...

Heat generated by the quantum defect (QD) in optically pumped lasers can result detrimental effects such as mode instability, frequency noise, and even catastrophic damage. Previously, we demonstrated that boson-peak-based Raman fiber have great potential low QD laser generation. But their power scalability heat load characteristics yet to be investigated. Here, demonstrate a amplifier (RFA) with 815 W output of 1.3%. The generation this RFA are demonstrated. Both experimental simulation...

Spectral evolution in nonlinear optical processes, such as second harmonic generation (SHG) and sum frequency (SFG), plays a crucial role multi-wavelength through conversion. In this study, the enhancement of spectral performance visible laser facilitated by SHG-SFG hybrid processes is proposed demonstrated, for first time to our knowledge. An output up eleven wavelengths can be achieved using six-wavelength pump. Theoretical analysis suggests that increase channel count attributed...

The phosphosilicate fiber-based Raman fiber laser (RFL) has great potential in achieving low-quantum defect (QD) high-power output. However, the laser's performance could be seriously degraded by Raman-assisted four-wave mixing (FWM) effect and spontaneous generation at 14.7 THz. To find possible ways to suppress FWM generation, here, we propose a revised power-balanced model simulate nonlinear process low-QD RFL. power evolution characteristics this RFL with different pump directions are...

High-power, spectrum-tailorable superfluorescent fiber sources (SFSs) have garnered considerable attention owing to their unique temporal-spectral characteristics and power scalability. However, previously reported SFSs exhibit limited spectral manipulation capabilities due gain competition nonlinear effects at high powers. In this paper, we demonstrate a kilowatt-level SFS with exceptional regulation by employing seed spectrum pre-compensation scaling three amplifier stages. Specifically,...

Abstract This study presents a high-accuracy, all-fiber mode division multiplexing (MDM) reconstructive spectrometer (RS). The MDM was achieved by utilizing custom-designed 3 × 1 mode-selective photonics lantern to launch distinct spatial modes into the multimode fiber (MMF). facilitated information transmission increasing light scattering processes, thereby encoding optical spectra more comprehensively speckle patterns. Spectral resolution of 2 pm and recovery 2000 spectral channels were...

Abstract This study demonstrates a kilowatt-level, spectrum-programmable, multi-wavelength fiber laser (MWFL) with wavelength, interval and intensity tunability. The central wavelength tuning range is 1060–1095 nm the tunable number controllable from 1 to 5. can be tuned 6 32 of each channel adjusted independently. Maximum output power up approximately 1100 W has been achieved by master oscillator amplifier structures. We also investigate evolution experimentally considering difference gain...

The speckle field yielded by disordered media is extensively employed for spectral measurements. Existing reconstructive spectrometers (RSs) implemented neural networks primarily rely on supervised learning, which necessitates large-scale spectra-speckle pairs. However, beyond system stability requirements prolonged data collection, generating diverse spectra with high resolution and finely labeling them particularly difficult. A lack of variety in datasets hinders the generalization to new...

Raman fiber laser (RFL) has been widely adopted in astronomy, optical sensing, imaging, and communication due to its unique advantages of flexible wavelength broadband gain spectrum. Conventional RFLs are generally based on silica fiber. Here, we demonstrate that the phosphosilicate a broader spectrum as compared common fiber, making it better choice for conversion. By using medium, propose build tunable RFL, compare operation bandwidth with fiber-based RFL. The RFL can operate within shift...