Theoretical research on optimizing the output power of double-ended output fiber laser

Wan, Yingchao; Wang, Xiaolin; Shi, Chen; Zhang, Hanwei; Yang, Baolai; Xi, Xiaoming; Wang, Peng

doi:10.1117/12.2587623

Cited by 3 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the reflectivity of HR FBG cannot reach 100%, and a small portion of the laser light will be output through the HR FBG, which is we call the backward light. Simulation results show that he intensity of the backward light increases as the reflectivity of the HR FBG decreases, and when the reflectivity of both gratings is the same, the laser output power at both ends is very close [7] . Compared with two unidirectional output lasers, it significantly reduces the number of devices in the resonant cavity and simplifies the laser system such as the cooling module, thus allowing further reduction in average cost and structure size in mass production.…”

Section: Introductionmentioning

confidence: 93%

“…We believe that a bidirectional output fiber laser oscillator can satisfy this requirement. The bidirectional output fiber laser oscillator can realize two high-power laser outputs with only one laser resonant cavity [6][7][8] . As shown in Figure 1, normally there is a high-reflectivity (HR) fiber Bragg grating (FBG) and a low-reflectivity (LR) FBG in the resonant cavity of an allfiber laser oscillator.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

2.6 kW×2 high power bidirectional output fiber laser oscillator

Zhong

Yang

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

View full text Add to dashboard Cite

Fiber laser oscillators play a vital role in industrial processing, national defense research and other fields. Traditional high power fiber oscillator lasers can only achieve unidirectional output, which is determined by the resonator structure. We propose a new structure that is simple and compatible with the ordinary fiber laser oscillator, which can achieve double high power laser output with only one resonant cavity. Typically, the resonant cavity of all-fiber laser oscillator contains a high-reflectivity grating and a low-reflectivity grating. Briefly, by replacing the high inverse grating with a low inverse grating, the unidirectional output laser oscillator can be converted into a b-directional output laser oscillator. It is suitable for applications that do not require high power and can have multiple lasers working at the same time, because of the smaller size and lower cost. We select a double-cladding Yb-doped fiber with 25/400 μm core/cladding diameter. The length of fiber is 35 m and its absorption coefficient is 0.33 dB/m at the wavelength of 915 nm. By means of bi-directionally pumping with 981 nm laser diodes, the maximum output power at both ends is 2871W and 2666 W respectively. We believe that with the further study of stimulated Raman scattering and transverse mode instability, bidirectional output lasers can achieve higher power outputs.

show abstract

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

2.6 kW×2 high power bidirectional output fiber laser oscillator

Zhong

Yang

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

View full text Add to dashboard Cite

show abstract

2 × 2 kW near-single-mode bidirectional high-power output from a single-cavity monolithic fiber laser

et al. 2022

View full text Add to dashboard Cite

Traditional monolithic fiber lasers can only achieve unidirectional high-power laser output. In this Letter, a novel high-power linear cavity fiber laser that can achieve bidirectional high-power output is proposed and demonstrated. In an ordinary laser resonant cavity, we replace the high-reflectivity fiber Bragg grating with a low-reflectivity fiber Bragg grating to realize bidirectional laser output. In our experiment, the laser cavity was composed of two fiber Bragg gratings with a reflectivity of about 10%. The pump power provided by the 976 nm laser diodes was injected into a double-clad Yb-doped fiber with core/cladding diameters of 20/400 µm. At the maximum pump power, the bidirectional output powers were 2025 W and 1948 W, respectively, and the output laser beam quality (M2 factor) at both ends was about 1.5. For the first time, to the best of our knowledge, the feasibility of a bidirectional output fiber laser that can achieve double high (2-kW-level) power was verified. Compared with a traditional unidirectional output laser, this type of bidirectional output laser can achieve a double high-power laser by employing a laser resonant cavity. Thus, the average cost and structure size can be further reduced in mass production.

show abstract

Research of Transverse Mode Instability in High-Power Bidirectional Output Yb-Doped Fiber Laser Oscillators

Ding

Wang

et al. 2023

Photonics

View full text Add to dashboard Cite

Bidirectional output fiber laser oscillators can realize two high-power laser outputs employing only a single-laser resonant cavity and hold the advantages of being low cost and of compact size. However, like other fiber lasers, their power improvement is limited by transverse mode instability (TMI). To achieve higher power output, in this paper, the characteristics and corresponding suppression method of the TMI in bidirectional output fiber laser oscillators were investigated for the first time. Firstly, the TMI threshold was obtained when the fiber laser oscillator was pumped by 976 nm LDs and 981 nm LDs, separately, and the difference between the two pumping conditions was researched in detail. After that, a comparison study between the bidirectional and unidirectional output fiber laser oscillators pumped by 981 nm LDs was carried out. In the experiment, the effect of pump distribution on the TMI threshold was also considered. The results show that the TMI threshold of the bidirectional-output laser pumped by 981 nm LDs is much higher than that pump by 976 nm LDs, which means that the effective TMI suppression methods in the unidirectional output laser are also applicable in the bidirectional output laser. In addition, it is found that the TMI threshold of a bidirectional output fiber laser is much lower than that of a unidirectional output fiber laser.

show abstract

Theoretical research on optimizing the output power of double-ended output fiber laser

Cited by 3 publications

References 2 publications

2.6 kW×2 high power bidirectional output fiber laser oscillator

2.6 kW×2 high power bidirectional output fiber laser oscillator

2 × 2 kW near-single-mode bidirectional high-power output from a single-cavity monolithic fiber laser

Research of Transverse Mode Instability in High-Power Bidirectional Output Yb-Doped Fiber Laser Oscillators

Contact Info

Product

Resources

About