1239/1484 nm cascaded phosphosilicate Raman fiber laser with CW output power of 1.36 W at 1484 nm pumped by CW Yb-doped double-clad fiber laser at 1064 nm and spectral continuum generation

Kim, Nam Seong; Prabhu, Mahendra; Li, Cheng; Song, Jie; Ueda, Ken–ichi

doi:10.1016/s0030-4018(00)00525-3

Cited by 44 publications

(9 citation statements)

References 7 publications

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“…Therefore put = t1Pj(L) = t1P1(P)/2 (8) and the residual pump power: p0out = t0P exp{-aoL -goPi(P)L}. (9) One can see that the value of Prt decreases when P1 grows up.…”

Section: Analytical Modelmentioning

confidence: 98%

<title>Analytical model of a two-stage Raman fiber laser considering intensity interactions in cascades</title>

2004

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In the present work we have developed an analytical model which takes into account power distribution along the fiber in the two-stage Raman fiber laser thus enabling both qualitative and quantitative comparison with performed experiment. The model describes pump power depletion and intensity interactions in cascades that seem important in the experiment. It is shown that the cascade generation saturates (depletes) sequentially: depletion of residual pump power begins when the first Stokes generation starts, then the first Stokes power saturates when the second Stokes generation starts etc. We have also compared the resalts of calculations with measurements of intensities in cascades and residual pump power which confirm the model qualitatively. Good quantitative coincidence with the experiment is also reached but for this we have to take into account spectral broadening of the first Stokes wave with increasing pump power. The presented model adequately describes the thresholds, the differential efficiency for the first and the second Stokes waves generation, the saturation levels for the residual pump and the first Stokes wave powers.

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“…Therefore put = t1Pj(L) = t1P1(P)/2 (8) and the residual pump power: p0out = t0P exp{-aoL -goPi(P)L}. (9) One can see that the value of Prt decreases when P1 grows up.…”

Section: Analytical Modelmentioning

confidence: 98%

<title>Analytical model of a two-stage Raman fiber laser considering intensity interactions in cascades</title>

2004

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“…[21][22][23][24] In principle, a Raman laser can emit any wavelength only if a proper pump source and Raman gain medium are chosen. [27][28][29][30][31][32] Therefore, the cascaded Raman scattering in combination with new mode-locking techniques has great potential in ultrafast pulsed lasers. 25,26 Furthermore, the use of a cascaded Raman process can extend the mode-locked spectra to some new wavelengths.…”

Section: Introductionmentioning

confidence: 99%

1484-nm two-cascaded Raman fiber laser mode-locked by an intermode-beating mode-locking technique

Xiong

Huang

et al. 2015

Opt. Eng

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We demonstrate a 1484-nm two-cascaded Raman mode-locked fiber laser based on the intermodebeating mode-locking (IBML) technique. Through the two-cascaded Raman shifts of P 2 O 5 in a phosphosilicate fiber, the continuous-wave (CW) 1064-nm Raman pump can be transferred to the 1484-nm second-order Stokes. When the intermode-beating frequency of the 1064-nm pump source matches with the 1484-nm Raman-cavity frequency, the IBML condition is satisfied, and the harmonic mode-locking at 1484-nm occurs to stably emit nanosecond pulse trains. By properly adjusting the 1484 nm Raman-cavity length, we have further realized the tuning of the mode-locking harmonic order. The 472nd-and 757th-order harmonic mode-locking operations with repetition rates of 72.728 and 116.292 MHz have been obtained, respectively. The IBML operation is stable with a radio-frequency (RF) supermode suppression ratio of 33.9 dB and RF signal-to-noise ratio of 51.8 dB.

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“…Recently Raman fiber lasers (RFLs) based on phosphosilicate fiber are widely investigated theoretically and experimentally [1][2][3] due to their attractive applications in optical communication and optical sensors. The phosphosilicate fiber has a larger Stokes shift (1330cm -1 ) than the germanosilicate fiber (440cm -1 ) and thus a smaller number of cascades are demanded to generate the same wavelength for the phosphosilicate RFL.…”

Section: Introductionmentioning

confidence: 99%

High power LD-end-pumped Nd:YVO 4 laser as a pump source for Raman fiber laser

et al. 2007

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A LD-single-end-pumped Nd:YVO 4 CW all-solid-state laser with maximum output power 12.5W at 1064nm was designed to pump the cascaded phosphosilicate fiber Raman laser. The Nd:YVO 4 laser is lower in cost than Yb-doped cladding fiber laser which is usually used as a pump for Raman fiber laser. However, it is inefficient to couple pump beam into single mode fiber (SMF). The coupling efficiency from pump beam to SMF is largely affected by the beam quality. Thus, a high coupling efficiency requires maintaining laser's operation in the TEM 00 mode while scaling the power. The beam quality and maximum output power of the Nd:YVO 4 laser is restricted by the thermal lens and fracture within the gain medium under high pump intensity conditions. The thermal effects was decreased by using a 3×3× 10mm 3 Nd:YVO 4 crystal with a low neodymium-doped concentration (0.3at%). Furthermore, a plane-plane resonant cavity with large mode volume and a large pump size was also used to reduce the effects. The Nd:YVO 4 laser with maximum output power 12.5W and M 2 <1.2 was obtained. More power than 4W was injected into cascaded Raman cavity at the maximum pump power and about 1W coherent second-order Stokes radiation at 1484nm was achieved.

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1239/1484 nm cascaded phosphosilicate Raman fiber laser with CW output power of 1.36 W at 1484 nm pumped by CW Yb-doped double-clad fiber laser at 1064 nm and spectral continuum generation

Cited by 44 publications

References 7 publications

<title>Analytical model of a two-stage Raman fiber laser considering intensity interactions in cascades</title>

<title>Analytical model of a two-stage Raman fiber laser considering intensity interactions in cascades</title>

1484-nm two-cascaded Raman fiber laser mode-locked by an intermode-beating mode-locking technique

High power LD-end-pumped Nd:YVO 4 laser as a pump source for Raman fiber laser

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