High-power picosecond terahertz-wave generation in photonic crystal fiber via four-wave mixing

【作者】 武辉辉； 刘红军； Nan Huang；

【Author】 Huihui Wu,Hongjun Liu,Nan Huang (State Key Laboratory of Transient Optics and Photonics,Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Science (CAS),Xi’an,710119)

【机构】 State Key Laboratory of Transient Optics and Photonics,Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Science(CAS)；

【摘要】 <正>Generation of picosecond terahertz(THz)-wave via four-wave mixing in a photonic crystal fiber (PCF) was demonstrated.This was accomplished by using a dispersion-flattened octagonal photonic crystal fiber(O-PCF),which was reported with such major attractive features as low confinement loss,smaller effective area,and wideband single-mode operation.Perfect phase matching was achieved by operating near zero-dispersion wavelength(1.55 um) in O-PCF.Using this method,when the energy-conservation and phase-matching conditions were satisfied,THz waves can be generated across the frequency range 7.07-7.74 THz.As a result of that,both phase-matching curve and related THz frequencies are shown in Fig.1(a).Through changing the length of O-PCF ranging from 5.30 cm to 7.30 cm,the peak power of 7.42 THz-wave has got a maximum value of 2.55 W at 6.25 cm.Consequently,the peak power of 2.55 W and the peak conversion efficiency of more than -66.65 dB at 7.42 THz are realized with a pump peak power of 2 kW in a 6.25-cm-long O-PCF.Moreover,the temporal domain pulse of the THz waves tuned from 7.07 THz to 7.74 THz along a 6.25-cm-long O-PCF is shown in Fig.1(b).Although these tuning ranges of THz waves are narrow,we could use dispersion-controlled PCFs to obtain wide tuning characteristics.This method and results demonstrate a promising way to realize a reasonable,easy to use,compact THz-wave source.更多还原

【Abstract】 Generation of picosecond terahertz(THz)-wave via four-wave mixing in a photonic crystal fiber (PCF) was demonstrated.This was accomplished by using a dispersion-flattened octagonal photonic crystal fiber(O-PCF),which was reported with such major attractive features as low confinement loss,smaller effective area,and wideband single-mode operation.Perfect phase matching was achieved by operating near zero-dispersion wavelength(1.55 um) in O-PCF.Using this method,when the energy-conservation and phase-matching conditions were satisfied,THz waves can be generated across the frequency range 7.07-7.74 THz.As a result of that,both phase-matching curve and related THz frequencies are shown in Fig.1(a).Through changing the length of O-PCF ranging from 5.30 cm to 7.30 cm,the peak power of 7.42 THz-wave has got a maximum value of 2.55 W at 6.25 cm.Consequently,the peak power of 2.55 W and the peak conversion efficiency of more than -66.65 dB at 7.42 THz are realized with a pump peak power of 2 kW in a 6.25-cm-long O-PCF.Moreover,the temporal domain pulse of the THz waves tuned from 7.07 THz to 7.74 THz along a 6.25-cm-long O-PCF is shown in Fig.1(b).Although these tuning ranges of THz waves are narrow,we could use dispersion-controlled PCFs to obtain wide tuning characteristics.This method and results demonstrate a promising way to realize a reasonable,easy to use,compact THz-wave source.更多还原