1. Ultrafast Fibre Lasers
Dual-wavelength
Ultrafast Fibre Lasers
Donna Strickland
Guelph-Waterloo Physics Institute (GWPI)
Department of Physics and Astronomy
University of Waterloo

2. System layout r Oscillator Stretcher Regenerative amplifier Compressor
Argon Ion Laser
Ti:sapphire rod
Oscillator
Stretcher
grating
mirror
Regenerative amplifier
Frequency doubled 10Hz, Nd:YAG
gratings
Compressor

3. Dual Wavelength Spectra

4. Mid-Infrared Generation
Cross-Correlator
BBO
polarizer
half-wave
plate
delay
line
AgGaS2
MIR
Cross-correlator
spectrometer

5. Two-Photon Absorption
2x10-2
Photon conversion
efficiency
1x10-2
1.0
Absorption
Fresnel Losses
0.0
0.0
0.1
1.0
Energy Input (mJ)

6. Two-Photon Absorption

7. Yb:Fibre Lasers

8. (ideally an oscillator)
Two-Colour Fibre System
Two-colour seed
(ideally an oscillator)
Two-colour fibre amplifier
Two-colour compressor

9. Ti:sapphire Oscillator
Two-Colour Fibre Seed
Ti:sapphire Oscillator
Photonic
Crystal Fibre

10. Seed Spectrum
Wavelength (nm)

11. Two-Colour Fibre Amplifier
Yb-doped double-clad
fibre
Dichroic mirrors
Notch filter
10 m
10m
Faraday Isolator
Two-colour seed 2W
965 nm
Pump diode
4W, 915 nm
Pump Diode

12. Amplifier Spectrum
Wavelength (nm)

13. Two-Colour Fibre Compressor
5cm

14. Two-Colour Cross-Correlation

15. Mid-infrared and next steps
HgCdTe
detector
GaSe
new pre-amplifier - single clad
new two colour oscillator - Yb:fibre or Yb:solid state
incorporate fibre elements into amplifier - Bragg grating rather than interference filter

16. Acknowledgements Post-doctoral Fellows Undergraduates Dongfeng Liu
Jie Song
Undergraduates
Jason Young
Sarah Johnson
Chris Ferrie
Paul Carr