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K ansas L ight S ource Laser System. J. R. Macdonald Laboratory Department of Physics, Kansas State University September, 2010. Kansas Light Source: Amplified Ti:Sapphire Laser System. Amplifier. KLS output. Multi-pass Ti:Sapphire Amplifier. Mode-Locked Ti:Sapphire Oscillator. - PowerPoint PPT Presentation
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Kansas Light SourceLaser System
J. R. Macdonald LaboratoryDepartment of Physics, Kansas State University
September, 2010
Kansas Light Source: Amplified Ti:Sapphire Laser System
Noncolinear f-2f interferometer
Beam splitter
Chirp mirror compressore
Ne gas filled hollow fiber(L=1 m)
TiS crystal
Beam splitter
Stretcher
Spectrometer
FROG
Power meter
Colinear f-2f interferometer
Pump laser
Feedback loop to stabilize CEP
Ti:sapphire oscillator
Compressor
Pump laser
Amplifier
Mode-LockedTi:Sapphire Oscillator
350 mW Average Power12 fs Pulse Width
80 MHz Repetition Rate5 nJ Pulse Energy800 nm Central
Wavelength95 nm Bandwidth
Multi-passTi:Sapphire Amplifier4 W Average Power27 fs Pulse Width
2 KHz Repetition Rate2 mJ Pulse Energy780 nm Central
Wavelength40 nm Bandwidth
KLS output
Light Amplification by Stimulated Emission of Radiation
Light Amplification by Stimulated Emission of Radiation
Cavity mirror Cavity mirror/output coupler
Pump
Laser medium Laser output
Optical cavity→ LASER
Interaction of light with matterIn laser medium
Population inversion → LASER
AbsorptionSpontaneous
emissionStimulatedemission
Ti:Sapphire crystalTi3+:Al2O3
Chirped Pulse Amplification
Mode-locked oscillator
M6
M3
M0M1
Ti:SM5
M7
M4E M4
M2 M8CP
Note:M7, M8, M12 and M13 mirrors are chirped mirrors.M-1,M9 and M10 are periscopes. A 50% beam splitter in M9.
Lens
M-1
Horizontal polarization from oscillator
M9 M10
M11M12
M13
Power meter and spectrometer
Pump verdi
To stretcher and amplifier
To f to 2f system
OC
KLS oscillator -- FemtoLaser
CPA stretcher/compressor
PositiveDispersion
NegativeDispersion
KLS stretcher
KLS Multi-Pass Amplifier
KLS Multi-Pass Amplifier
FROG: Beam Diagnostic
spectrometer
BS
TranslationStage
M1
M2
M3
M4
M5
M6
BBO
From Laser
InfraredFilter
1k
2k
I1(t) I2(t)
KLS system
Oscillator PC1
PD1
CEP Control
Menlo System
Delay Generator
SRS 645
80 MHz
Pump1
Pump2
PC1
PC2
PC2
PD2 PD3 PD4
Oscilloscope
2 kHz
KLS system timing
Oscillator: pump laser, crystal chiller, photo diode, Menlo timing controller
Amplifier: crystal chamber and vacuum pump, liquid nitrogen controller, Dewar, delay generator, pockels cells, pockels cell power supplies, pump lasers, pump laser power supplies, pump laser control computers, pump laser chillers, photo diodes, oscilloscope, power meter, power monitor, power locking PID (proportional–integral–derivative) controller, spectrometer, spectrometer computer
FROG: spectrometer, spectrometer computer, CCD camera, FROG computer
Other: power meters, mobile spectrometer, IR viewer, IR cards
KLS subsystems and devices
Coated Mirrors (metal or dielectric): reflectivity, phase, bandwidth, damage thresholdBeamsplitters: dielectric coating, reflectivity and transmission, phase, bandwidth, damage thresholdLens and windows: coating, material, thicknessWave plates: coating, material, thicknessPolarizerChirped mirror and compensation platesGratings and prismsNonlinear optical crystals
Optics
SafetyWear your goggles
Know where the beam goesDo not put your eyes at the beam height
ContactKun Zhao (Harry)
Baozhen ZhaoAl Rankin
Well, let’s see some real stuff now
Spectrum, Dispersion, Chromatic Aberration
Chromatic and Astigmatism AberrationsOf a Lens
Birefringence and Wave Plate
Half-wave plate
Polarization, s or p
Energy, Power, Spectrum
Femtolaser oscillator
Horizontal
To f-2f system
Half wave plate
Pokcel cellPolarizer
Polarizer
Photodiode
Photodiode Flip Half wave plate
Fara
Polarizer
PolarizerHalf wave plate
Horizontal
Linear Horizontal+45degree
HorizontalTo amplifier
M9
M10IRIS1
IRIS2IRIS3
IRIS4
Sm1
Sm2
Sg1Sg2
Sc1 Sc2
Sm3
Sm4
Powermeter
Pump1
First pass
Second pass
Third pass
Fourth pass
Fifth pass
Sixth pass
Seventh pass
Photodiode1
Photodiode3-7
Photodiode2
Pump2
CCD
Photodiode14
Monitor Power meter
M1
M2
M3
M4
M5M6
M7
M10 M9
M8
M11
M12
M13
CEP Lock
Verdi-6
Femtolaser oscillator
Evolution 30 Evolution 30
PC1
PC2
Final Output
Stretcher
Compressor
Amplifier
Seed
Pump Pump
2
2
2
2
Oscillator PC1
PD1 CE measure
CE ControlMenlo System
Channel Timer
BNC 555B
System TimerBNC 555A
Pulse GeneratorPhilips PM5712
75 MHz, 1V
f/16
2V
f/45
A
B
C
D
f/4
Pump1380
Pump2302
PC11900
PC21940
10ns
5µs
PC2
PD275M-1kHz
400 mV
PD31 kHz
150 mV
PD41 kHz, 1V1.5 V, jitter 1 ns
to ExperimentOscilloscopeTek TDS3054
KLS Timing Jan 15, 2005
DG535 Pump1: A: 510 ns; B: A + 5 s Pump2: C: 310 ns; D: C + 5 sDelay Unit: > 1 usPC1: Delay 55 ns; Width 10 nsPC2: Delay 45 ns; Width 10 ns
DG535 0 AB CD
Pump1 Pump2
Delay OUT IN
Laser Metrics 5046INPUT
Q-SW CW
Trig Delay Width MON Outputs
HV Bias
HV Adj
Laser Metrics 5046INPUT
Q-SW CW
Trig Delay Width MON Outputs
HV Bias
HV Adj
Pockels Cell 1
Pockels Cell 2
Photo Diode
Long cable delay goes to control room
7.5 kV 7.5 kV
Master kHz signal is generated by DG535. PC1 is trigged by the kHz laser signal selected by the master signal and the signal from the photo diode. PC2 is trigged by the MON signal from PC1. Long cables are used for PC1 to compensate the trig delay of PC2
76 MHz kHz