7 April 2015 1484-nm two-cascaded Raman fiber laser mode-locked by an intermode-beating mode-locking technique
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Abstract
We demonstrate a 1484-nm two-cascaded Raman mode-locked fiber laser based on the intermode-beating mode-locking (IBML) technique. Through the two-cascaded Raman shifts of P2O5 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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Fengfu Xiong, Yizhong Huang, Lili Le, Bin Xu, Nan Chen, Zhiping Cai, Zhengqian Luo, "1484-nm two-cascaded Raman fiber laser mode-locked by an intermode-beating mode-locking technique," Optical Engineering 54(4), 046102 (7 April 2015). https://doi.org/10.1117/1.OE.54.4.046102 . Submission:
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