Laser system for LCGT Norikatsu MIO 1 Power

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Laser system for LCGT Norikatsu MIO 1

Laser system for LCGT Norikatsu MIO 1

Power requirement for LGCT laser 150 W 75 W Laser 780 W G=11 50

Power requirement for LGCT laser 150 W 75 W Laser 780 W G=11 50 % 2

Laser system for LCGT • 150 W Output: Injection locking + MOPA 3

Laser system for LCGT • 150 W Output: Injection locking + MOPA 3

Design concept • Injection-locked laser: Stable optical mode Frequency control element • Power amplifier:

Design concept • Injection-locked laser: Stable optical mode Frequency control element • Power amplifier: Easy operation, Cascadable for higher power operation Intensity control element 4

Injection locked laser • Maser laser:2 -W NPRO – Innolight Mephisto • Slave: 100

Injection locked laser • Maser laser:2 -W NPRO – Innolight Mephisto • Slave: 100 -W ring laser – Laser module:Mitsubishi – Resonator and Controller:U-Tokyo 5

Laser module (Mitsubishi) Two rods and rotator Diffusive reflector +LD 6

Laser module (Mitsubishi) Two rods and rotator Diffusive reflector +LD 6

Slave laser • Ring laser with two laser modules 7

Slave laser • Ring laser with two laser modules 7

Output power of the slave laser • 121 W by bidirectional oscillation 8

Output power of the slave laser • 121 W by bidirectional oscillation 8

100 -W Power laser • Injection locking with 2 -W master laser (NPRO) 9

100 -W Power laser • Injection locking with 2 -W master laser (NPRO) 9

Realization of single frequency oscillation • Scanning Fabry-Perot output Free Injection Locking 100 -W

Realization of single frequency oscillation • Scanning Fabry-Perot output Free Injection Locking 100 -W Single Frequency oscillation by injection locking 10

Long term stability Continuous operation for more than 6 hours 11

Long term stability Continuous operation for more than 6 hours 11

MOPA and intensity stabilization (test bench) Master NPRO Amplifier FR 12

MOPA and intensity stabilization (test bench) Master NPRO Amplifier FR 12

Intensity stabilization performance Unity Gain freq. 30 k. Hz Loop Gain at 100 Hz

Intensity stabilization performance Unity Gain freq. 30 k. Hz Loop Gain at 100 Hz 100 db 13

Ongoing experiments • Frequency stabilization of the 100 -W laser. • EOM test for

Ongoing experiments • Frequency stabilization of the 100 -W laser. • EOM test for high-power laser light. – Mg. O-doped Stoichiometric Li. Nb. O 3 • Final stage amplifier (50 W) will be tested soon. 14

Frequency stabilization experiment • Triangular reference cavity (Dn=152 k. Hz) • Transmission intensity curve

Frequency stabilization experiment • Triangular reference cavity (Dn=152 k. Hz) • Transmission intensity curve Feedback system is being developed 15

Summary • Basic components for the LCGT laser have been completed. – 100 -W

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. 16