Exploration of Difference Frequency Generation (DFG) for Laser Beam Generation
Nuts and Bolts
Difference Frequency Generation (DFG)
Beam Time 7/15/14
Josh Nelson
Derrek Wilson
Carlos Trallero
Goals
•
Create DFG from signal and idler (OPA)
•
Confirm that a beam from DFG is produced
OPA
•
Signal = 1000 – 1550 nm
•
Idler = 1600 – 2500 nm
Conservation of Energy and momentum give out
signal and idler
OPA
Pump Beam
signal
idler
DFG Process
Signal
Idler
DFG
Conservation of Energy
ω
s
–
ω
i
=
ω
DFG
Conservation of Momentum
K
s
– K
i
= K
DFG
Setup for DFG
KLS
2 mJ, 2
KHz, 30 fs
800 nm
OPA
0.5 mJ
for S + I
S
I
AgGaS2
(silver
thiogallate)
DFG
crystal
Germanium
Window
I
DFG
S
Block
Power
Meter
Data
Showed Phase Matching
Signal = 1470 nm
Idler = 1750 nm
1/
λ
s
– 1/
λ
i
= 1/
λ
DFG
λ
DFG
= 9200 nm
Energy Split: S = 83% I = 17%
Data
•
Power after OPA = 1 W
•
Calcite aligned so that signal and idler lose
overlap in time
Signal = 1450 nm
Idler = 1705 nm
1/
λ
s
– 1/
λ
i
= 1/
λ
DFG
λ
DFG
= 9700 nm
Energy Split: S =66% I = 34%
1.2 mW
1.0 mW
10.5 mW
Conclusion/Future
•
Effectively demonstrated DFG procedure
•
Found the wavelength of DFG in which gives
us the largest power
•
Future:
–
Change setup to allow for better control over time
overlap of signal and idler
–
Use setup on HITS
Examining the process of Difference Frequency Generation (DFG) for creating laser beams, establishing signal and idler wavelengths, and optimizing power output. The study delves into conservation of energy and momentum principles, showcasing experimental results and proposing future improvements for enhanced control and applications.
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Presentation Transcript
Nuts and Bolts Difference Frequency Generation (DFG) Beam Time 7/15/14 Josh Nelson Derrek Wilson Carlos Trallero
Goals Create DFG from signal and idler (OPA) Confirm that a beam from DFG is produced
OPA Signal = 1000 1550 nm Idler = 1600 2500 nm signal Pump Beam OPA idler Conservation of Energy and momentum give out signal and idler
DFG Process DFG Signal Idler Conservation of Energy s i = DFG Conservation of Momentum Ks Ki = KDFG
Setup for DFG AgGaS2 (silver thiogallate) Block S S KLS 2 mJ, 2 KHz, 30 fs OPA 0.5 mJ for S + I I 800 nm DFG crystal I Power Meter DFG Germanium Window
Signal = 1470 nm Idler = 1750 nm 1/ s 1/ i = 1/ DFG DFG = 9200 nm Energy Split: S = 83% I = 17% Data Showed Phase Matching
Signal = 1450 nm Idler = 1705 nm 1/ s 1/ i = 1/ DFG DFG = 9700 nm Energy Split: S =66% I = 34% Data Power after OPA = 1 W Powers of variating setups 12 10.5 mW 10 8 Power (mW) 6 4 2 1.2 mW 1.0 mW 0 DFG and Germanium Germanium Germanium and Calcite Variating Setups Calcite aligned so that signal and idler lose overlap in time
Conclusion/Future Effectively demonstrated DFG procedure Found the wavelength of DFG in which gives us the largest power Future: Change setup to allow for better control over time overlap of signal and idler Use setup on HITS
