12  kW clad pumped Raman all-passive-fiber laser with brightness enhancement

Glick, Yaakov; Shamir, Yariv; Aviel, Matitya; Sintov, Yoav; Goldring, Sharone; Shafir, N.; Pearl, Shaul

doi:10.1364/ol.43.004755

Cited by 37 publications

(20 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An optical fiber was used as the gain medium to achieve Raman lasing in 1976 [100]. Owing to the optical confinement provided by the small core area, optical fibers proved to be efficient frequency converters producing output powers as high as 3 kW and few hundreds of watts in 1 µm and 1.5 µm range, respectively [98,[101][102][103][104]. However, the narrow optical transparency of the fiber material, small Raman shift, and the absence of resonators required for frequency doubling/tripling limited their applications [99].…”

Section: Output Power Of Cw Raman Lasersmentioning

confidence: 99%

Power Scaling of CW Crystalline OPOs and Raman Lasers

Sarang

Richardson

2021

Photonics

View full text Add to dashboard Cite

Optical parametric oscillators (OPOs) and Raman lasers are two nonlinear-based laser technologies that extend the spectral range of conventional inversion lasers. Power and brightness scaling of lasers are significant for many applications in industry, medicine, and defense. Considerable advances have been made to enhance the power and brightness of inversion lasers. However, research around the power scaling of nonlinear lasers is lacking. This paper reviews the development and progress of output power of continuous-wave (CW) crystalline OPOs and Raman lasers. We further evaluate the power scalability of these two laser technologies by analyzing the cavity architectures and gain materials used in these lasers. This paper also discusses why diamond Raman lasers (DRLs) show tremendous potential as a single laser source for generating exceedingly high output powers and high brightness.

show abstract

Section: Output Power Of Cw Raman Lasersmentioning

confidence: 99%

Power Scaling of CW Crystalline OPOs and Raman Lasers

Sarang

Richardson

2021

Photonics

View full text Add to dashboard Cite

show abstract

“…In the former scheme, the coupled pump light in the cladding is converted into the Stokes laser transmitted through the core of fiber to obtain BE. The power record for cladding-pumped RFL is 1.2 kW, and the corresponding M 2 is 2.75 with a BE of 7 [23] . The manufacture of these unique Raman fibers is usually complicated and costly, however, the cladding-tocore area ratio required is small (< 8) to suppress high-order Stokes light, imposing a limitation upon BE capacity based on the currently available pump brightness [24] .…”

Section: Introductionmentioning

confidence: 99%

“…It is, however, challenging to achieve high beam quality at this power level, especially when the enlarged fiber core is employed to suppress second-order Stokes light. In fact, the output beam quality of high-power RFLs can also be good enough to meet practical requirements, based on brightness enhancement (BE) employing either claddingpumping double-clad or multi-clad fibers [21][22][23] , or corepumping graded-index (GRIN) fibers [12,[18][19][20] . In the former scheme, the coupled pump light in the cladding is converted into the Stokes laser transmitted through the core of fiber to obtain BE.…”

Section: Introductionmentioning

confidence: 99%

Greater than 2 kW all-passive fiber Raman amplifier with good beam quality

Chen

Yao

et al. 2020

High Pow Laser Sci Eng

View full text Add to dashboard Cite

We report a 2 kW all-fiberized Raman fiber amplifier with efficient brightness enhancement based on the graded-index fiber. The maximum power output reaches up to 2.034 kW centered at 1130 nm, with a conversion efficiency of 79.35% with respect to the injected pump power. To the best of our knowledge, this is the highest conversion efficiency obtained for any Raman laser system using graded-index fiber. An optimized fiber combiner adopting graded-index fiber as the pigtail fiber was fabricated, enabling the preservation of the seeding brightness in the core-pumped Raman fiber amplifier, and further enhancing the ultimate brightness of the output laser after amplification. At the maximum power output, the beam quality parameter M2 is 2.8, corresponding to a signal-to-pump brightness enhancement factor of 11.2. As far as we know, we obtain the highest brightness enhancement among Raman fiber lasers of over 100 W, and the best beam quality for graded-index Raman fiber lasers of over 150 W.

show abstract

“…The spectral broadening could be suppressed by using a larger-core-size fiber. In 2018, Glick et al reported a 1.2 kW cladding pumped Raman laser by using a 80-m-long specialty multi-layer fiber (25/45/250 µm) [16] . Chen et al proposed a 987 W Raman laser with a large GRIN fiber [17] .…”

Section: Introductionmentioning

confidence: 99%

“…In 2018, Glick et al. reported a 1.2 kW cladding pumped Raman laser by using a 80-m-long specialty multi-layer fiber (25/45/250 ) [16] . Chen et al.…”

Section: Introductionmentioning

confidence: 99%

Dual-wavelength bidirectional pumped high-power Raman fiber laser

Wang

Xiao

Huang

et al. 2019

High Pow Laser Sci Eng

View full text Add to dashboard Cite

In this paper, we reported both the experimental demonstration and theoretical analysis of a Raman fiber laser based on a master oscillator–power amplifier configuration. The Raman fiber laser adopted the dual-wavelength bidirectional pumping configuration, utilizing 976 nm laser diodes and 1018 nm fiber lasers as the pump sources. A 60-m-long $25/400~\unicode[STIX]{x03BC}\text{m}$ ytterbium-doped fiber was used to convert the power from 1070 to 1124 nm, realizing a maximum power output of 3.7 kW with a 3 dB spectral width of 6.8 nm. Moreover, we developed a multi-frequency model taking into consideration the Raman gain spectrum and amplified spontaneous emission. The calculated spectral broadening of both the forward and backward laser was in good agreement with the experimental results. Finally, a 1.5 kW, 1183 nm second-order Raman fiber laser was further experimentally demonstrated by the addition of a 70-m-long germanium-doped passive fiber.

show abstract

12 kW clad pumped Raman all-passive-fiber laser with brightness enhancement

Cited by 37 publications

References 22 publications

Power Scaling of CW Crystalline OPOs and Raman Lasers

Power Scaling of CW Crystalline OPOs and Raman Lasers

Greater than 2 kW all-passive fiber Raman amplifier with good beam quality

Dual-wavelength bidirectional pumped high-power Raman fiber laser

Contact Info

Product

Resources

About