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Extremely Widely Tunable (1.0-1.7 m) Yb-doped Fiber Mode-Locked Laser Source with ~100 fs Pulse Widths based on Raman Frequency Shift
 

Summary: Extremely Widely Tunable (1.0-1.7 Ám) Yb-doped Fiber Mode-Locked Laser
Source with ~100 fs Pulse Widths based on Raman Frequency Shift
Jahan Dawlaty1
, Andy Chong2
, Farhan Rana1
1
School of Electrical and Computer Engineering, Cornell University, Ithaca NY
2
School of Applied and Engineering Physics, Cornell University, Ithaca NY
Abstract: A widely tunable (1.0-1.7Ám) femtosecond laser source based on Raman
induced frequency shift in a photonic crystal fiber pumped by a Yb-doped mode-locked
fiber laser is presented. The output pulses are ~100 fs wide with ~0.5 nJ pulse energy.
Cost effective, widely tunable, femtosecond laser sources are important for a variety of applications such as
optical communications, spectroscopy, and optical measurements. Raman self-frequency shift of optical
pulses in fibers is a technique commonly used to realize tunable femtosecond laser sources [1-3]. Till
recently, pulse frequency shifts of 100-300 nm had been demonstrated [1-3]. Recently, highly nonlinear
fibers have been used to extend the tunability of femtosecond pulses to cover the entire wavelength range
from 1.0 Ám to 1.7 Ám allowing for pulse tunability to cover an entire octave in frequency [4]. As pulses
propagate in a highly nonlinear fiber, the longer wavelength components of the pulse gain energy at the
cost of the shorter wavelengths via the Raman effect. If the input pulse energies and widths satisfy the

  

Source: Afshari, Ehsan - School of Electrical and Computer Engineering, Cornell University

 

Collections: Engineering