Generation of a broadband continuum with high spectral coherence in tapered single-mode optical fibers

Lu, Fei; Knox, Wayne H.

doi:10.1364/opex.12.000347

Cited by 101 publications

(40 citation statements)

References 6 publications

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“…In this manuscript, spectral coherence of the Stokes pulse is measured employing a delayed pulse method [23] Prior work has reported low intensity noise of the TZDW continua employing a sub-100 fs and relatively cleaner Nd:glass laser oscillator as the pump source [25]. To verify if it holds for our TZDW fiber source, we measure the intensity noise of the filtered Stokes pulse with its peak wavelength tuned to 1260 nm at 240 mW of pump power.…”

Section: Coherence and Noise Measurement Of The Intense Stokes Pulsesmentioning

confidence: 99%

Interferometric coherence measurement and radio frequency noise characterization of the 1.3 μm femtosecond intense Stokes continuum from a TZDW source

Yao

Knox

2015

SPIE Proceedings

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Photonic crystal fiber (PCF) with two closely spaced zero dispersion wavelengths (TZDW) offers a unique route to efficient energy transfer to two spectrally localized continua beyond either side of the ZDWs, which we have employed in previous work for mid-IR difference frequency generation and speckle-free red-green-blue generation. In this manuscript, we report the interferometric coherence characterization and radio frequency (RF) noise measurements of the Stokes side TZDW component. With a custom-built 1.3 W, 1035 nm, 40 MHz, 240 fs Yb:fiber chirped pulse amplifier as the pump source, we use 12 cm of commercially available TZDW PCF to excite the dual narrow-band continua from which the Stokes pulse is filtered out with a 1180 nm long wave pass filter. We achieve 0.8 to 3 nJ of narrow-band pulses within the spectral range of 1200 -1315 nm at an average power conversion efficiency of 33%.Employing an un-balanced Michelson interferometer, measured mutual spectral coherence of the Stokes pulse is in excess of 0.76 with pump Soliton order as high as N ~70. Its measured RF noise spectrum at the first harmonic of the laser repetition rate shows less than 8 dBc/Hz increase in relative intensity noise (RIN) compared to that of the power amplifier, which is consistent with reported studies employing sub-100 fs pulses from relatively low noise oscillators. In contrast to the broadband continuum from a single ZDW PCF wherein severe de-coherence is found with pumping at high soliton order and longer pump pulse width, the reported TZDW fiber source shows preservation of intensity stability and phase coherence against variation in pump pulse parameters, which not only attests to the stability of our reported method for mid-IR generation, but also shows promising potential towards an all-fiber, efficient and low noise ultrafast source that can be helpful for applications such as biomedical deep-tissue imaging.

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Section: Coherence and Noise Measurement Of The Intense Stokes Pulsesmentioning

confidence: 99%

Interferometric coherence measurement and radio frequency noise characterization of the 1.3 μm femtosecond intense Stokes continuum from a TZDW source

Yao

Knox

2015

SPIE Proceedings

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“…The results, shown on fig 1 (a), predict full coherence over the whole bandwidth of the supercontinuum (for a high enough signal to noise ratio). Experimentally, the coherence function can be implemented by use of a Mach-Zehnder interferometer with a delay in one arm corresponding to the temporal separation of two subsequent pulses [10]. When the power in the two arms is equal, the coherence function exactly corresponds to the fringe visibility V = (I max − I min )/(I max + I min ).…”

Section: Coherencementioning

confidence: 99%

Experimental demonstration of coherent supercontinuum generation in a silicon wire pumped at telecommunication wavelengths

et al. 2014

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“…Laser pulses of 100-mW average power ͑pulse energies= 1.25 nJ͒ are coupled into a holey fiber that is operated in normaldispersion regime to generate low-noise, broadband, pure self-phase modulation ͑SPM͒. 22 The beam is then divided into two arms, in which we select two narrow wavelength bands at 800 nm and 840 nm with high-efficiency notch filters ͑Sem-rock FF01-800/12-25 & FF01-840/12-25͒, as shown in Fig. 1.…”

Section: Imaging Systemmentioning

confidence: 99%

Forty-five degree backscattering-mode nonlinear absorption imaging in turbid media

Cui

Knox

2010

J. Biomed. Opt.

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Abstract. Two-color nonlinear absorption imaging has been previously demonstrated with endogenous contrast of hemoglobin and melanin in turbid media using transmission-mode detection and a dual-laser technology approach. For clinical applications, it would be generally preferable to use backscattering mode detection and a simpler single-laser technology. We demonstrate that imaging in backscattering mode in turbid media using nonlinear absorption can be obtained with as little as 1-mW average power per beam with a single laser source. Images have been achieved with a detector receiving backscattered light at a 45-deg angle relative to the incoming beams' direction. We obtain images of capillary tube phantoms with resolution as high as 20 m and penetration depth up to 0.9 mm for a 300-m tube at SNR ϳ1 in calibrated scattering solutions. Simulation results of the backscattering and detection process using nonimaging optics are demonstrated. A Monte Carlo-based method shows that the nonlinear signal drops exponentially as the depth increases, which agrees well with our experimental results. Simulation also shows that with our current detection method, only 2% of the signal is typically collected with a 5-mm-radius detector. © 2010 Society of Photo-Optical Instrumentation Engineers.

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Generation of a broadband continuum with high spectral coherence in tapered single-mode optical fibers

Cited by 101 publications

References 6 publications

Interferometric coherence measurement and radio frequency noise characterization of the 1.3 μm femtosecond intense Stokes continuum from a TZDW source

Interferometric coherence measurement and radio frequency noise characterization of the 1.3 μm femtosecond intense Stokes continuum from a TZDW source

Experimental demonstration of coherent supercontinuum generation in a silicon wire pumped at telecommunication wavelengths

Forty-five degree backscattering-mode nonlinear absorption imaging in turbid media

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