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 Assembly (TXA) ALADIN instrument Laser Output Requirements Parameter Aladin TXA Energy/pulse > 150 mJ Polarisation Linear, better than 100 :1 2 M < 3.5 Reference Laser Power Laser ≤ 100 ns FWHM Pulse duration Laser ≤ 50 MHz FWHM Head Head Pulse linewidth beam 99% of the pulse energy within 90 (RLH) (PLH) Spectral purity Fiber MHz Frequency < 4 MHz rms over the measurement stability time ±7.5GHz for adjustm. Electrical I/F connector Tunability ±5 GHz in calibr. mode Electrical I/F < 1 MHz rms over 28 min (noise) Reg. Power Tuning connector < 1.7 MHz rms over 28 min (slow Bus (BR) accuracy drift) Transmitter Laser Electronics (TLE) Physical & Environmental Requirements Unreg. Power Parameter Aladin TXA Bus (BNR) PLH +RLH<31kg Transmitter Assembly (TXA) Mass TLE< 23 kg Stiffness (first eigen- PLH > 140 Hz Electrical I/F frequency for rigid boundary RLH > 300 Hz conditions) TLE > 300 Hz ALADIN Control & Data Single side conductive cooling Management Unit o C + 1°C 22 cold plate interface (ACDM) temperature 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. 2 COMPANY PROPERTY
ALADIN instrument- -TXA Functional Block Diagram TXA Functional Block Diagram ALADIN instrument RLH PLH Heater Driver from TLE Reference 3 dB 10 GHz LD pumping Laser Coupler Photodiode current pulse from TLE PLH Reference Laser FM Modulator Locking Heater(s) 10% PT1000 ULE Cavity Electronics PreAmplifier (to TLE) Pump 90% Seeder Power Master Oscillator Diodes Ligth Trap Laser Splitter Seeder Laser Seeder beam from RLH Laser I/F & Active DC/DC (via optical fibre) MO Cavity to PLH Control Heaters Frequency medium Conv. Unit Locking Loop 1st & 2nd LD pumping harmonic Pump current pulse Diodes from TLE P/S TC TM PT1000 (from TLE) PZT driving from (from TLE) Active (to TLE) (to TLE) TLE (Cavity Length PZT Harmonic medium Control Loop) Converter & PLH Wavelength heaters Q- Pump Q-Switch HV and Selector UV Laser Pulse Switch Diodes control signal from TLE Amplifier PLH_HTR ON/OFF MO MO LDPSM (From I/F Section) LD Pump Current Energy Monitoring (to TLE) PreAmp BNR PreAmp LDPSM LD Pump Current LD pumping current pulse Amp from TLE LD Pump Current Amp LDPSM Direct Temperature HC Temperature EMI Filter Telemetry Control Direct Telemetries from TLE Q-switch HV & Aux Voltage BR LV/HV PSU RLH Power Supplies 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 : Interface & Control Section Synchros CMDs -A low energy A low energy Nd Nd:YAG Master Oscillator (MO), injection seeded :YAG Master Oscillator (MO), injection seeded Cavity I/F & TeleCommands Lenght Control TeleMetries Control Q-switched and longitudinally laser pumped by laser diodes. switched and longitudinally laser pumped by laser diodes. Module Board -A first amplifier ( A first amplifier (PreA PreA) in a double pass configuration ) in a double pass configuration 3 (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 Piezo PD PD HK Q-switch Heaters Temp TLE Control Voltages Control Sensors (transversally diode pumped). (transversally diode pumped). - A Harmonic Section (HS) employing two non A Harmonic Section (HS) employing two non-linear crystals. linear crystals. 3 COMPANY PROPERTY
ALADIN instrument- - Laser Transmitter Units Laser Transmitter Units ALADIN instrument 4 COMPANY PROPERTY
ALADIN instrument- - PLH Optical Lay PLH Optical Lay- -Out Out ALADIN instrument Telescope HG SECTION Dichroic SHG THG λ/2 mirrors 1064nm Cylindrical Lenses 532nm Beam expander Folding Power Amplifier λ/2 Mirror AMPLIFIER SECTION 355nm Pre Amplifier Polarizer HR Mirror λ/4 Cylindrical Lenses Piezo Monitor Polarizer Photodiode Master Oscillator Q-Switch HR Mirror Beam Rod Expander MO SECTION Isolator Piezo - Folding Mirror Mirror Pigtail fiber Cylindrical lens Tablet Isolator λ/2 isolator Input from RLH Folding Mirror INJECTION OPTICS 5 COMPANY PROPERTY
ALADIN instrument- - PLH Mechanical Structure PLH Mechanical Structure ALADIN instrument 6 COMPANY PROPERTY
ALADIN instrument- -PLH Main Subassemblies: MO PLH Main Subassemblies: MO ALADIN instrument EO Q -switch Pumping diodes Nd:YAG rod Polarizer Outcoupler mirror 7 COMPANY PROPERTY
ALADIN instrument- -PLH Main Subassemblies: AMPLIFIERS PLH Main Subassemblies: AMPLIFIERS ALADIN instrument 8 COMPANY PROPERTY
ALADIN instrument- -PLH Main Subassemblies: HARMONIC SECTION PLH Main Subassemblies: HARMONIC SECTION ALADIN instrument 9 COMPANY PROPERTY
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) ≤ 3 M 2 Pulse duration 18.4 ns (FWHM) 24.4 µ rad X (zig-zag plane) Beam Angular Stability 28.7 µ rad 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 PLH EQM = 27.3 kg Mass RLH EM = 2.4 kg TLE EM < 22.2 kg PLH = 450x350x215 mm 3 3 Volume RLH < 150x120x75 mm TLE < 450x345x230 mm 3 PLH Resonance frequency X axis 182 Hz Y axis 288 Hz Z axis 251 Hz RLH Resonance frequency Stiffness X axis 347 Hz Y axis 342 Hz TLE Resonance frequency X axis 220 Hz Y axis 430 Hz Z axis 510 Hz 24 ± 1 °C Cold Plate Power consumption 440 W (measured average value) 10 COMPANY PROPERTY
TXA EQM EXPERIMENTAL RESULTS TXA EQM EXPERIMENTAL RESULTS 450 150 IR energy @ SHC input E mean =402 mJ E max =420 mJ 360 120 E min =375 mJ rd pass energy (mJ) UV energy (mJ) 270 90 UV energy @ dichroic output E mean = 107 mJ Typical UV Near Field profile E max = 128 mJ 180 60 E min = 69 mJ IR 3 90 30 0 0 0 2 4 6 8 10 12 Time (s) IR/UV Energy during 12 s. The reported values refer to last 7 s useful period Typical UV Far Field profile 11 COMPANY PROPERTY
TXA EQM EXPERIMENTAL RESULTS TXA EQM EXPERIMENTAL RESULTS UV Frequency stability 15 10 Frequency variation (MHz) 5 0 -5 -10 -15 5 6 7 8 9 10 11 12 ON Period (s) Typical UV pulse temporal profile Optical frequency stability UV beam angular stability during a burst 12 COMPANY PROPERTY
TXA SPECIFIC PROVISIONS TXA SPECIFIC PROVISIONS Cleanliness/Contamination MOC exposition PLH EQM curve 13 COMPANY PROPERTY
TXA SPECIFIC PROVISIONS TXA SPECIFIC PROVISIONS In-Flight monitoring and control 14 COMPANY PROPERTY
TXA SPECIFIC PROVISIONS TXA SPECIFIC PROVISIONS TXA functional mode diagram and mode control parameters 15 COMPANY PROPERTY
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