INTERNATIONAL CONFERENCE ON SPACE OPTICS 2006 … · 1 company property uv characterization of...
Transcript of INTERNATIONAL CONFERENCE ON SPACE OPTICS 2006 … · 1 company property uv characterization of...
1COMPANY PROPERTY
UV CHARACTERIZATION OF ENGINEERING QUALIFICATION MODEL OF ALADIN LASER TRANSMITTER
INTERNATIONAL CONFERENCE ON SPACE OPTICS 2006
Nordwijk 27 JUNE 2006
2COMPANY PROPERTY
ALADIN instrumentALADIN instrument--Transmitter Laser Assembly (TXA)Transmitter Laser Assembly (TXA)
Laser Output Requirements
Parameter Aladin TXA
Energy/pulse > 150 mJPolarisation Linear, better than 100 :1M2 < 3.5Pulse duration ≤ 100 ns FWHMPulse linewidth ≤ 50 MHz FWHM
Spectral purity99% of the pulse energy within 90MHz
Frequencystability
< 4 MHz rms over the measurementtime
Tunability ±7.5GHz for adjustm.±5 GHz in calibr. mode
Tuningaccuracy
< 1 MHz rms over 28 min (noise)< 1.7 MHz rms over 28 min (slowdrift)
Physical & Environmental Requirements
Parameter Aladin TXA
Mass PLH +RLH<31kgTLE< 23 kg
Stiffness (first eigen-frequency for rigid boundaryconditions)
PLH > 140 HzRLH > 300 HzTLE > 300 Hz
Single side conductivecoolingcold plate interfacetemperature
22oC + 1°C
Average power consumption < 470 W
Most stringent requirements :Most stringent requirements :--Frequency stability and tuning accuracy.Frequency stability and tuning accuracy.--Environmental requirements, especially mass, stiffness and thermEnvironmental requirements, especially mass, stiffness and thermal I/F with al I/F with AladinAladin instrument.instrument.--Lifetime.Lifetime.
Reference LaserHead(RLH)
Power LaserHead(PLH)
Transmitter LaserElectronics (TLE)
connector
connector
Transmitter Assembly (TXA)
Electrical I/FElectrical I/F
Laserbeam
Reg. PowerBus (BR)
Unreg. PowerBus (BNR)
Electrical I/F
ALADIN Control & DataManagement Unit
(ACDM)
Fiber
3COMPANY PROPERTY
ALADIN instrumentALADIN instrument--TXA Functional Block DiagramTXA Functional Block Diagram
RLH PLH
TLE
PLH is a diodePLH is a diode--pumped, Qpumped, Q--switched switched NdNd:YAG Laser frequency tripled:YAG Laser frequency tripledand it is composed of 4 main subunitsand it is composed of 4 main subunits::
--A low energy A low energy NdNd:YAG Master Oscillator (MO), injection seeded :YAG Master Oscillator (MO), injection seeded QQ--switched and longitudinally laser pumped by laser diodes.switched and longitudinally laser pumped by laser diodes.--A first amplifier (A first amplifier (PreAPreA) in a double pass configuration ) in a double pass configuration (transversally diode pumped).(transversally diode pumped).--A second power amplifier (A second power amplifier (PwAPwA) in a single pass configuration ) in a single pass configuration (transversally diode pumped).(transversally diode pumped).-- A Harmonic Section (HS) employing two nonA Harmonic Section (HS) employing two non--linear crystals.linear crystals.
Ligth TrapMaster Oscillator
MO Cavity
PumpDiodes
PZT
Q-Switch
Activemedium
PreAmplifier
Amplifier
PumpDiodes
Activemedium
PumpDiodes
HarmonicConverter &Wavelength
Selector UV Laser Pulse
1st & 2ndharmonic
Seeder Laserbeam from RLH
(via optical fibre)
PLH
LD pumpingcurrent pulse
from TLE
LD pumpingcurrent pulse
from TLE
LD pumpingcurrent pulse
from TLE
PZT driving fromTLE (Cavity Length
Control Loop)
Q-Switch HV andcontrol signal
from TLE
PT1000(to TLE)
EnergyMonitoring
(to TLE)
HC TemperatureControl
from TLE
Heater(s)
Heater Driverfrom TLE
ReferenceLaser
10 GHzPhotodiode
I/F &Control
Unit
DC/DCConv.
SeederLaser
3 dBCoupler
FM ModulatorULE Cavity
Reference LaserLocking
Electronics
PowerSplitter
FrequencyLocking Loop
10%
90%
SeederLaser
to PLH
TC(from TLE)
TM(to TLE)
P/S(from TLE) PT1000
(to TLE)
Heaters
BNR
EMI Filter
Interface & Control Section
CavityLenghtControlBoard
I/F &ControlModule
Direct Telemetries
PDTempSensors
HeatersControl
Q-switchPiezoControl
PD
Q-switch HV & Aux Voltage
AmpLD Pump Current
PreAmpLD Pump Current
MOLD Pump Current
RLH Power SuppliesBR
Synchros CMDs
Direct TemperatureTelemetry
PLHheaters
PreAmp LDPSM
Amp LDPSM
MO LDPSM
LV/HV PSU
HKVoltages
PLH_HTR ON/OFF(From I/F Section)
3
TeleCommandsTeleMetries
4COMPANY PROPERTY
ALADIN instrumentALADIN instrument-- Laser Transmitter UnitsLaser Transmitter Units
5COMPANY PROPERTY
ALADIN instrumentALADIN instrument-- PLH Optical LayPLH Optical Lay--OutOut
Piezo Monitor
Beam Expander
HR Mirror
Tablet isolator
Cylindrical lens λ/2 Isolator
INJECTION OPTICS
MO SECTION
AMPLIFIER SECTION
HG SECTION
Cylindrical Lenses
1064nm
532nm
Pre Amplifier
Polarizer λ/4 HR Mirror
Folding Mirror
Power Amplifier
Cylindrical Lenses
λ/2
355nm
SHG THG λ/2 Telescope
Piezo-Mirror
Master Oscillator
Rod
Q-Switch Photodiode
Isolator
Dichroic mirrors
Beam expander
Polarizer
Folding Mirror
Folding Mirror
Pigtail fiber
Input from RLH
6COMPANY PROPERTY
ALADIN instrumentALADIN instrument-- PLH Mechanical StructurePLH Mechanical Structure
7COMPANY PROPERTY
ALADIN instrumentALADIN instrument--PLH Main Subassemblies: MOPLH Main Subassemblies: MO
Pumping diodes
Polarizer
EO Q-switch
Nd:YAG rod
Outcoupler mirror
8COMPANY PROPERTY
ALADIN instrumentALADIN instrument--PLH Main Subassemblies: AMPLIFIERSPLH Main Subassemblies: AMPLIFIERS
9COMPANY PROPERTY
ALADIN instrumentALADIN instrument--PLH Main Subassemblies: HARMONIC SECTIONPLH Main Subassemblies: HARMONIC SECTION
10COMPANY PROPERTY
TXA EQM EXPERIMENTAL RESULTSTXA EQM EXPERIMENTAL RESULTSTable 1. Main UV Laser Output Performance
Parameter EQM Measurement Energy/pulse 107 mJ (mean during ON period) M2 ≤ 3 Pulse duration 18.4 ns (FWHM)
Beam Angular Stability 24.4 µrad X (zig-zag plane) 28.7 µrad Y (orthogonal to zig-zag plane)
Spectral linewidth 40 MHz (FWHM) Frequency stability 3.7 MHz (rms value)
Table 1. Physical Data & Budgets Parameter EQM Measurement
Mass PLH EQM = 27.3 kg RLH EM = 2.4 kg TLE EM < 22.2 kg
Volume PLH = 450x350x215 mm3 RLH < 150x120x75 mm3 TLE < 450x345x230 mm3
Stiffness
PLH Resonance frequency X axis 182 Hz Y axis 288 Hz Z axis 251 Hz
RLH Resonance frequency X axis 347 Hz Y axis 342 Hz
TLE Resonance frequency X axis 220 Hz Y axis 430 Hz Z axis 510 Hz
Cold Plate 24 ± 1 °C Power consumption 440 W (measured average value)
11COMPANY PROPERTY
TXA EQM EXPERIMENTAL RESULTSTXA EQM EXPERIMENTAL RESULTS
0 2 4 6 8 10 120
90
180
270
360
450
IR energy @ SHC input Emean=402 mJ Emax=420 mJEmin=375 mJ
UV energy @ dichroic outputEmean= 107 mJ Emax = 128 mJ Emin = 69 mJ
UV
energy (mJ)
IR 3
rd p
ass
ener
gy (
mJ)
Time (s)
0
30
60
90
120
150
IR/UV Energy during 12 s. The reported values
refer to last 7 s useful period
Typical UV Near Field profile
Typical UV Far Field profile
12COMPANY PROPERTY
TXA EQM EXPERIMENTAL RESULTSTXA EQM EXPERIMENTAL RESULTS
UV Frequency stability
-15
-10
-5
0
5
10
15
5 6 7 8 9 10 11 12ON Period (s)
Fre
qu
ency
var
iati
on
(M
Hz)
Typical UV pulse temporal profile
UV beam angular stability during a burst
Optical frequency stability
13COMPANY PROPERTY
TXA SPECIFIC PROVISIONSTXA SPECIFIC PROVISIONS
MOC exposition PLH EQM curve
Cleanliness/Contamination