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UV CHARACTERIZATION OF ENGINEERING QUALIFICATION MODEL OF ALADIN - - PowerPoint PPT Presentation
UV CHARACTERIZATION OF ENGINEERING QUALIFICATION MODEL OF ALADIN - - PowerPoint PPT Presentation
UV CHARACTERIZATION OF ENGINEERING QUALIFICATION MODEL OF ALADIN LASER TRANSMITTER INTERNATIONAL CONFERENCE ON SPACE OPTICS 2006 Nordwijk 27 JUNE 2006 1 COMPANY PROPERTY ALADIN instrument- -Transmitter Laser Assembly (TXA) Transmitter Laser
2 COMPANY PROPERTY
ALADIN instrument ALADIN instrument-
- Transmitter Laser Assembly (TXA)
Transmitter Laser Assembly (TXA)
Laser Output Requirements
Parameter Aladin TXA Energy/pulse > 150 mJ Polarisation Linear, better than 100 :1 M
2
< 3.5 Pulse duration ≤ 100 ns FWHM Pulse linewidth ≤ 50 MHz FWHM Spectral purity 99% of the pulse energy within 90 MHz Frequency stability < 4 MHz rms over the measurement time Tunability ±7.5GHz for adjustm. ±5 GHz in calibr. mode Tuning accuracy < 1 MHz rms over 28 min (noise) < 1.7 MHz rms over 28 min (slow drift)
Physical & Environmental Requirements
Parameter Aladin TXA Mass PLH +RLH<31kg TLE< 23 kg Stiffness (first eigen- frequency for rigid boundary conditions) PLH > 140 Hz RLH > 300 Hz TLE > 300 Hz Single side conductive cooling cold plate interface temperature 22
- C + 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 therm
Environmental requirements, especially mass, stiffness and therm al I/F with al I/F with Aladin Aladin instrument. instrument.
- Lifetime.
Lifetime. Reference Laser Head (RLH) Power Laser Head (PLH) Transmitter Laser Electronics (TLE)
connector connector
Transmitter Assembly (TXA) Electrical I/F Electrical I/F
Laser beam
- Reg. Power
Bus (BR)
- Unreg. Power
Bus (BNR) Electrical I/F
ALADIN Control & Data Management Unit (ACDM)
Fiber
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ALADIN instrument ALADIN instrument-
- TXA Functional Block Diagram
TXA Functional Block Diagram
RLH PLH TLE PLH is a diode PLH is a diode-pumped, Q pumped, Q-switched switched Nd Nd:YAG Laser frequency tripled :YAG Laser frequency tripled and it is composed of 4 main subunits and it is composed of 4 main subunits :
- A low energy
A low energy Nd Nd:YAG Master Oscillator (MO), injection seeded :YAG Master Oscillator (MO), injection seeded Q-switched and longitudinally laser pumped by laser diodes. switched and longitudinally laser pumped by laser diodes.
- A first amplifier (
A first amplifier (PreA PreA) in a double pass configuration ) in a double pass configuration (transversally diode pumped). (transversally diode pumped).
- A second power amplifier (
A second power amplifier (PwA PwA) in a single pass configuration ) in a single pass configuration (transversally diode pumped). (transversally diode pumped).
- A Harmonic Section (HS) employing two non
A Harmonic Section (HS) employing two non-linear crystals. linear crystals.
Ligth Trap Master Oscillator MO Cavity Pump Diodes PZT Q- Switch Active medium PreAmplifier Amplifier Pump Diodes Active medium Pump Diodes Harmonic Converter & Wavelength Selector UV Laser Pulse 1st & 2nd harmonic Seeder Laser beam from RLH (via optical fibre)
PLH
LD pumping current pulse from TLE LD pumping current pulse from TLE LD pumping current pulse from TLE PZT driving from TLE (Cavity Length Control Loop) Q-Switch HV and control signal from TLE PT1000 (to TLE) Energy Monitoring (to TLE) HC Temperature Control from TLE Heater(s) Heater Driver from TLE
Reference Laser 10 GHz Photodiode I/F & Control Unit DC/DC Conv. Seeder Laser 3 dB Coupler FM Modulator ULE Cavity Reference Laser Locking Electronics Power Splitter Frequency Locking Loop 10% 90% Seeder Laser to PLH TC (from TLE) TM (to TLE) P/S (from TLE) PT1000 (to TLE) Heaters BNR EMI Filter Interface & Control Section Cavity Lenght Control Board I/F & Control Module
Direct Telemetries PD Temp Sensors Heaters Control Q-switch Piezo Control PD Q-switch HV & Aux Voltage Amp LD Pump Current PreAmp LD Pump Current MO LD Pump Current RLH Power Supplies
BR
Synchros CMDs Direct Temperature Telemetry PLH heaters
PreAmp LDPSM Amp LDPSM MO LDPSM LV/HV PSU
HK Voltages
PLH_HTR ON/OFF (From I/F Section) 3
TeleCommands TeleMetries
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ALADIN instrument ALADIN instrument-
- Laser Transmitter Units
Laser Transmitter Units
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ALADIN instrument ALADIN instrument-
- PLH Optical Lay
PLH Optical Lay-
- Out
Out
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
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ALADIN instrument ALADIN instrument-
- PLH Mechanical Structure
PLH Mechanical Structure
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ALADIN instrument ALADIN instrument-
- PLH Main Subassemblies: MO
PLH Main Subassemblies: MO
Pumping diodes Polarizer EO Q
- switch
Nd:YAG rod Outcoupler mirror
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ALADIN instrument ALADIN instrument-
- PLH Main Subassemblies: AMPLIFIERS
PLH Main Subassemblies: AMPLIFIERS
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ALADIN instrument ALADIN instrument-
- PLH Main Subassemblies: HARMONIC SECTION
PLH Main Subassemblies: HARMONIC SECTION
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TXA EQM EXPERIMENTAL RESULTS TXA EQM EXPERIMENTAL RESULTS
Table 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 mm
3
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)
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TXA EQM EXPERIMENTAL RESULTS TXA EQM EXPERIMENTAL RESULTS
2 4 6 8 10 12 90 180 270 360 450
IR energy @ SHC input Emean=402 mJ Emax=420 mJ Emin=375 mJ UV energy @ dichroic output Emean= 107 mJ Emax = 128 mJ Emin = 69 mJ
UV energy (mJ) IR 3
rd pass energy (mJ)
Time (s)
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
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TXA EQM EXPERIMENTAL RESULTS TXA EQM EXPERIMENTAL RESULTS
UV Frequency stability
- 15
- 10
- 5
5 10 15 5 6 7 8 9 10 11 12 ON Period (s) Frequency variation (MHz)
Typical UV pulse temporal profile UV beam angular stability during a burst Optical frequency stability
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TXA SPECIFIC PROVISIONS TXA SPECIFIC PROVISIONS
MOC exposition PLH EQM curve
Cleanliness/Contamination
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TXA SPECIFIC PROVISIONS TXA SPECIFIC PROVISIONS
In-Flight monitoring and control
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