The generation of high-energy dual-wavelength domain wall pulse with a low repetition rate is demonstrated in a highly nonlinear fiber （HNLF）-based fiber ring laser. By introducing the intracavity birefringence-indu...The generation of high-energy dual-wavelength domain wall pulse with a low repetition rate is demonstrated in a highly nonlinear fiber （HNLF）-based fiber ring laser. By introducing the intracavity birefringence-induced spectral filtering effect, the dual-wavelength lasing operation can be achieved. In order to enhance the cross coupling effect between the two lasing beams for domain wall pulse formation, a 215-m HNLF is incorporated into the laser cavity. Experimentally, it is found that the dual-wavelength domain wall pulse with a repetition rate of 77.67 kHz could be efficiently obtained through simply rotating the polarization controller （PC）. At a maximum pump power of 322 mW, the 655-nJ single pulse energy in cavity is obtained. The proposed configuration provides a simpler and more efficient way to generate high energy pulse with a low repetition rate.展开更多
Ultrashort pulses at 920 nm are a highly desired light source in two-photon microscopy for the efficient excitation of green fluorescence protein.Although Nd3þ-doped fibers have been utilized for 920-nm ultrashor...Ultrashort pulses at 920 nm are a highly desired light source in two-photon microscopy for the efficient excitation of green fluorescence protein.Although Nd3þ-doped fibers have been utilized for 920-nm ultrashort pulse generation,the competitive amplified spontaneous emission(ASE)at 1.06μm remains a significant challenge in improving their performance.Here,we demonstrate a coordination engineering strategy to tailor the properties of Nd3þ-doped silica glass and fiber.By elevating the covalency between Nd3þand bonded anions via sulfur incorporation,the fiber gain performance at 920 nm is enhanced,and 1.06-μm ASE intensity is suppressed simultaneously.As a result,the continuous-wave laser efficiencies and signal-to-noise ratio at 920 nm by this fiber are significantly enhanced.Importantly,the stable picosecond pulses at 920 nm are produced by a passive mode-locking technique with a fundamental repetition rate up to 207 MHz,which,to the best of our knowledge,is the highest reported repetition rate realized by Nd3þ-doped silica fibers.The presented strategy enriches the capacity of Nd3þ-doped silica fiber in generating 920-nm ultrashort pulses for application in biophotonics,and it also provides a promising way to tune the properties of rare-earth ion-doped silica glasses and fibers toward ultrafast lasers.展开更多
We demonstrate a compact Ti:sapphire oscillator with ring cavity configuration.By optimizing the intra-cavity dispersion with chirped mirrors,pulses with repetition rate of 1.1 GHz are coupled out by the uncoated wedg...We demonstrate a compact Ti:sapphire oscillator with ring cavity configuration.By optimizing the intra-cavity dispersion with chirped mirrors,pulses with repetition rate of 1.1 GHz are coupled out by the uncoated wedges in the cavity.Under 7W CW pump laser centered at 532 nm,the average power of the output pulses is about 30 mW,the duration is less than 10fs and the spectrum spans from 670 nm to 920 nm.展开更多
In this work,we present a high-power,high-repetition-rate,all-fiber femtosecond laser system operating at 1.5μm.This all-fiber laser system can deliver femtosecond pulses at a fundamental repetition rate of 10.6 GHz ...In this work,we present a high-power,high-repetition-rate,all-fiber femtosecond laser system operating at 1.5μm.This all-fiber laser system can deliver femtosecond pulses at a fundamental repetition rate of 10.6 GHz with an average output power of 106.4 W–the highest average power reported so far from an all-fiber femtosecond laser at 1.5μm,to the best of our knowledge.By utilizing the soliton-effect-based pulse compression effect with optimized pre-chirping dispersion,the amplified pulses are compressed to 239 fs in an all-fiber configuration.Empowered by such a high-power ultrafast fiber laser system,we further explore the nonlinear interaction among transverse modes LP01,LP11 and LP21 that are expected to potentially exist in fiber laser systems using large-mode-area fibers.The intermodal modulational instability is theoretically investigated and subsequently identified in our experiments.Such a high-power all-fiber ultrafast laser without bulky free-space optics is anticipated to be a promising laser source for applications that specifically require compact and robust operation.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11074078,61378036,61307058,11304101,and 61177077)the Specialized Research Fund for the Doctoral Program of Higher Education,China(Grant No.20094407110002)the Ph.D.Start-up Fund of the Natural Science Foundation of Guangdong Province,China(Grant No.S2013040016320)
文摘The generation of high-energy dual-wavelength domain wall pulse with a low repetition rate is demonstrated in a highly nonlinear fiber （HNLF）-based fiber ring laser. By introducing the intracavity birefringence-induced spectral filtering effect, the dual-wavelength lasing operation can be achieved. In order to enhance the cross coupling effect between the two lasing beams for domain wall pulse formation, a 215-m HNLF is incorporated into the laser cavity. Experimentally, it is found that the dual-wavelength domain wall pulse with a repetition rate of 77.67 kHz could be efficiently obtained through simply rotating the polarization controller （PC）. At a maximum pump power of 322 mW, the 655-nJ single pulse energy in cavity is obtained. The proposed configuration provides a simpler and more efficient way to generate high energy pulse with a low repetition rate.
基金supported by the International Partnership Program of Chinese Academy of Sciences(Grant No.20XH1217)the National Natural Science Foundation of China(Grant Nos.61975216 and 62205356)the STCSM(Grant No.SKLSFO2022-02)。
文摘Ultrashort pulses at 920 nm are a highly desired light source in two-photon microscopy for the efficient excitation of green fluorescence protein.Although Nd3þ-doped fibers have been utilized for 920-nm ultrashort pulse generation,the competitive amplified spontaneous emission(ASE)at 1.06μm remains a significant challenge in improving their performance.Here,we demonstrate a coordination engineering strategy to tailor the properties of Nd3þ-doped silica glass and fiber.By elevating the covalency between Nd3þand bonded anions via sulfur incorporation,the fiber gain performance at 920 nm is enhanced,and 1.06-μm ASE intensity is suppressed simultaneously.As a result,the continuous-wave laser efficiencies and signal-to-noise ratio at 920 nm by this fiber are significantly enhanced.Importantly,the stable picosecond pulses at 920 nm are produced by a passive mode-locking technique with a fundamental repetition rate up to 207 MHz,which,to the best of our knowledge,is the highest reported repetition rate realized by Nd3þ-doped silica fibers.The presented strategy enriches the capacity of Nd3þ-doped silica fiber in generating 920-nm ultrashort pulses for application in biophotonics,and it also provides a promising way to tune the properties of rare-earth ion-doped silica glasses and fibers toward ultrafast lasers.
基金Supported by the National Natural Science Foundation of China (Grant Nos.60490281 and 60321003)National Basic Research Program of China (Grant No.2007CB815104)
文摘We demonstrate a compact Ti:sapphire oscillator with ring cavity configuration.By optimizing the intra-cavity dispersion with chirped mirrors,pulses with repetition rate of 1.1 GHz are coupled out by the uncoated wedges in the cavity.Under 7W CW pump laser centered at 532 nm,the average power of the output pulses is about 30 mW,the duration is less than 10fs and the spectrum spans from 670 nm to 920 nm.
基金NSFC Development of National Major Scientific Research Instrument(61927816)the Introduced Innovative Team Project of Guangdong Pearl River Talents Program(2021ZT09Z109)+6 种基金the Natural Science Foundation of Guangdong Province(2021B1515020074)the Mobility Programme of the Sino-German(M-0296)the Double First Class Initiative(D6211170)the Guangdong Key Research and Development Program(2018B090904003)the National Natural Science Foundation of China(NSFC)(U1609219)the Science and Technology Project of Guangdong(2020B1212060002)the Key R&D Program of Guangzhou(202007020003).
文摘In this work,we present a high-power,high-repetition-rate,all-fiber femtosecond laser system operating at 1.5μm.This all-fiber laser system can deliver femtosecond pulses at a fundamental repetition rate of 10.6 GHz with an average output power of 106.4 W–the highest average power reported so far from an all-fiber femtosecond laser at 1.5μm,to the best of our knowledge.By utilizing the soliton-effect-based pulse compression effect with optimized pre-chirping dispersion,the amplified pulses are compressed to 239 fs in an all-fiber configuration.Empowered by such a high-power ultrafast fiber laser system,we further explore the nonlinear interaction among transverse modes LP01,LP11 and LP21 that are expected to potentially exist in fiber laser systems using large-mode-area fibers.The intermodal modulational instability is theoretically investigated and subsequently identified in our experiments.Such a high-power all-fiber ultrafast laser without bulky free-space optics is anticipated to be a promising laser source for applications that specifically require compact and robust operation.
