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Laser system for LCGT Norikatsu MIO
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Power requirement for LGCT laser
50 % 150 W 75 W 780 W Laser G=11
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Laser system for LCGT 150W Output: Injection locking + MOPA
Explain why we need 150 W (what determines the output power?) Explain quickly (except essential parts) Emphasize the completed part?
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Design concept Injection-locked laser: Stable optical mode
Power amplifier: Easy operation, Cascadable for higher power operation Frequency control element Intensity control element
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Injection locked laser
Maser laser:2-W NPRO Innolight Mephisto Slave:100-W ring laser Laser module:Mitsubishi Resonator and Controller:U-Tokyo
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Laser module (Mitsubishi)
Diffusive reflector +LD Two rods and rotator
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Slave laser Ring laser with two laser modules
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Output power of the slave laser
121W by bidirectional oscillation
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100-W Power laser Injection locking with 2-W master laser (NPRO)
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Realization of single frequency oscillation
Scanning Fabry-Perot output Free 100-W Single Frequency oscillation by injection locking Injection Locking
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Long term stability Continuous operation for more than 6 hours
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MOPA and intensity stabilization (test bench)
Master NPRO FR Amplifier
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Intensity stabilization performance
Unity Gain freq. 30kHz Loop Gain at 100 Hz 100db
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Ongoing experiments Frequency stabilization of the 100-W laser.
EOM test for high-power laser light. MgO-doped Stoichiometric LiNbO3 Final stage amplifier (50W) will be tested soon.
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Frequency stabilization experiment
Triangular reference cavity (Dn=152kHz) Transmission intensity curve Feedback system is being developed
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Summary Basic components for the LCGT laser have been completed.
100-W single frequency operation has been achieved. Wide range intensity control has been done by the current-shunt method. Further experiments for frequency and intensity control are being performed.
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