femtosecond pulses 1 Longitudinal modes: Recapitulation D las = - PowerPoint PPT Presentation

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Kerr Lens Modelocking for femtosecond pulses 1 Longitudinal modes: Recapitulation D las = Spectral width of each mode Quality factor, Q T 0 = Time interval between two successive maxima = Time for decay of amplitude to A 0 / e T 0 <<

Kerr Lens Modelocking for femtosecond pulses 1
Longitudinal modes: Recapitulation D las = Spectral width of each mode
Quality factor, Q T 0 = Time interval between two successive maxima  = Time for decay of amplitude to A 0 / e T 0 <<  D las = Spectral width of each mode
Longitudinal modes in a bunch
I = A*A I peak = N 2 E 0 2
Modelocking Intensity = Modulus squared electric field I peak = N 2 E 0 2
Repetition rate Intensity = Modulus squared electric field First maximum: Second maximum: Difference in time T = t 2 – t 1 :
Pulse duration Intensity = Modulus squared electric field
Pulse duration and Intensity M. Didomenico, J. App. Phys. Lett. 35, (1964) 2870; Hargrove et al. Appl. Phys. Lett. 5 (1964) 4
Transform limited pulses Time domain Frequency domain Gaussian Gaussian
Transform limited pulses
Transverse modes E. W. Small, Chapter 2, Topics in Fluorescence Spectroscopy, J. R. Lakowicz
Transverse modes Intensity E. W. Small, Chapter 2, Topics in Fluorescence Spectroscopy, J. R. Lakowicz
Kerr Effect
Kerr Effect Intensity-dependent refractive index
Kerr Effect Intensity-dependent refractive index
Kerr Effect Intensity-dependent refractive index Kerr lensing
Kerr Effect Intensity-dependent refractive index Kerr lensing Intense beam: Focused Weak beam: Not focused
Kerr Effect Intensity-dependent refractive index Kerr lensing Pulsed light Intense beam: Focused Weak beam: Not focused
Kerr Effect Intensity-dependent refractive index Kerr lensing Pulsed light Intense beam: Focused Weak beam: Not focused CW light
Kerr Effect Intensity-dependent refractive index Kerr lensing Pulsed light Intense beam: Focused Weak beam: Not focused CW light
Kerr Lens Modelocking Intensity-dependent refractive index Kerr lensing Pulsed light Intense beam: Focused Weak beam: Not focused CW light
Chirping Courtesy: J. A. Mondal, BARC Kerr lensing Pulsed light Intense beam: Focused Weak beam: Not focused CW light

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