High-Efficiency, High-Power OPO-based RGB Source 2001...GRA00001 OPO pump laser design is...
Transcript of High-Efficiency, High-Power OPO-based RGB Source 2001...GRA00001 OPO pump laser design is...
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High-Efficiency, High-Power OPO-based RGB Source
Dicky Lee, Peter F. MoultonQ-Peak, Inc. 135 South Road, Bedford, MA 01730
Support: AFRL (WPAFB) Phase I and II SBIRsContract F33615-99-C-6009, Reginald Daniels
Paper CTHJ2 - CLEO 2001May 10
Baltimore, MD
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Outline
• Background
• Review of prior results
• Scaling to higher powers
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OPO-based RGB source
1-um Laser SHG
1047 nm 523 nm
OPO
SHG
SHG Blue
Green
Red
898 nm
1256 nm
449 nm
628 nm
U.S. Patent #5,740,190
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Relation between red and blue wavelengths
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430 435 440 445 450 455 460 465 470 475 480 485 490
Doubled signal wavelength (nm)
Dou
bled
idle
r wav
elen
gth
(nm
)
1064 nm
1047 nm
1030 nm
1080 nm
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RGB OPO provides large color gamut
610
PINK
PURPLISHPINK
RED
PURPLISHRED
REDDISHPURPLE
PURPLE
BLUE
GREENISHBLUE
BLUISHGREEN
GREEN
YELLOWISHGREEN
WHITE
YELLOWISH
PINK
20000
10000
6000
4000
30002000
B
E
CD
65
GREENISHYELLOW
YELLOWORANGE
PURPLISH BLUE
680650630
600590
570550530520
490
480
470
460
440
380-420 nm
700-780 nm
∞
LASE
R
CRT
LIQUI
D CRY
STAL
Δ SMPTE 240M
Δ
Δ
Δ
C.I.E. 1976 U.C.S.ChromaticityDiagram
GRA00001
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OPO pump laser design is side-pumped
Diode laser
Diode laser
Lasercrystal
Cylinder lens Laserbeam
Pumpbeam
Multi-Pass Slab (MPS)US Patent 5,774,489
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Photograph of Gain Module
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With the side-pumped design, diode to laser conversion is in the 35-46% range
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Pump Power (W)
Out
put P
ower
(W)
40 W, MM30 W, MM30 W, TEMoo20 W, TEMoo
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Prior RGB OPO Results
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Old pump-laser configuration produced10W at a 10-kHz pulse rate
Nd:YLF Oscillator
A/O QS
10 W at1047 nm
AmplifierGain Module
20 W at1047 nm
Pulse rate: 10 kHz
SecondHarmonic
Crystal
NCPMLBO
10 W at523.5 nm
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A temperature-tuned NCPM LBO OPO is the key element in the system
600700800900
1000110012001300140015001600170018001900
100 110 120 130 140 150 160 170 180
Temperature (C)
Sign
al, i
dler
wav
elen
gth
(nm
)
IdlerSignal
523.5-nm pump
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Schematic of RGB OPO
Type-IISHG LBO
Pump524 nm
Signal 898 nm +Green 524 nm
Red628 nm
Idler1256 nm
f = 29 mm
SWP: HR@ 1256 nm;HT@ 524, 628, and 898 nm
Intracavity SHG
Singly Resonant OPO Green524 nm
SWP
Signal898 nm
LWP
Walk-Off compensated
Type-I SHG LBO
Blue449 nm
Type-I OPO LBO
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OPO efficiency exceeded 60%
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0 1 2 3 4 5 6 7 8 9 10Pump Power (W)
Out
put P
ower
(W)
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Effic
ienc
y
1256 nm
898 nmEfficiency
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Watt-level doubled OPO outputs were generated
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Green power (W)
Pow
er (W
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SignalRedBlue
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Latest RGB OPO Results
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The new pump laser design generates30 W of power from 10 - 50 kHz
30 W @523.5 nm10-50 kHzM2 ≈ 1.1
Oscillator
Amplifier
Gain Modules
26 W (CW)
LBO doubler
52 W (CW)
Total pump power:128 W (optical)
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Pump laser IR to green conversion is 60%
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Pulse rate (Hz)
Ave
rage
pow
er (W
)
1047 nm523.5 nm
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Time
Inte
nsity
[A.U
.]
Before
After
OPO pump pulse time trace
~ 80% pump depletion
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High-power operation - The numbers
Wavelength Power (W)1047 nm (MOPA output) 50.0524 nm (before OPO) 30.0898 nm (signal) 13.0524 nm (residual) 5.8628 nm (red) 6.0449 nm (blue) 3.4 - 4.0
Conversion process Efficiency (%)1047 nm to 524 nm (Green) 60Green to 628 (Red) 20Green to 898 nm 43898 nm to 449 nm (Blue) 27 - 31
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RGB OPO in the laboratory
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Luminosity of the RGB OPO
1000 lumens of D65-balanced white requires:
1.42 W @ 628 nm1.33 W @ 524 nm0.85 W @ 449 nm
Red: 6.0 W => 4219 lumensGreen: 5.8 W => 4347 lumensBlue: 3.4 W => 4009 lumens
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Electrical luminous efficiency
Electrical power consumptionLaser diodes: 260 WQ-switch: 20 WOven: 40 WOthers: 45 WTotal: 365 W
=> 4000 lumens = 11.0 lumens/W360 W
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Semi-packaged RGB-OPO Light Source
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RGB optics (pump and OPO)packaged in 23” rack chassis
Pump oscillator
OPO andred SHG
BlueSHG
Pump amplifier
LBO doubler
RGB fiber outputs
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Entire system package withcontroller, power supply and chiller
RGB optics
Controllerelectronics
Power supply
Cooler
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Summary
• With 30 W of pump power,OPO-based RGB source has been scaled to generate:– 6 W at 628 nm– 3.4 - 4 W at 449 nm– 5.8 W of residual pump at 524 nm
• Optical power is equivalent to >4000 lumens• Efficiency is 11 lumens/W of electrical power• Power scalable to 8000 lumens?
– 40 W pump power per diode bar– additional amplifier– maximum output per OPO unit TBD