J. Kovalik, LIGO Livingston Observatory

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Presentation transcript:

J. Kovalik, LIGO Livingston Observatory Status of LLO PSL J. Kovalik, LIGO Livingston Observatory LIGO-G010070-00-D Lasers and Optics Working Group March 15, 2001

Lasers and Optics Working Group Overview General Performance Pre-Mode Cleaner Intensity Noise Frequency Noise Future LIGO-G010070-00-D Lasers and Optics Working Group

General Performance of PSL Master Oscillator Power Amplifier (MOPA) in almost continuous operation from 08/99-02/01 Laser output power slowly degraded over time Laser power decreased from 10W to 3W NPRO pump power decreased from 500 mW to 50mW NPRO noise performance degraded-frequency spikes and mode hopping With NPRO replacement –current output ~6.75 W Improvements made to Frequency Stabilization Servo Improvements made to Pre-Mode Cleaner Changes made to mirror mounts to reduce frequency noise Ongoing table configuration improvements LIGO-G010070-00-D Lasers and Optics Working Group

Pre-Mode Cleaner Changes Old Pre-Mode Cleaner ~75% Throughput 5.5 MHz bandwidth Epoxied at discrete points Open to atmosphere New Pre-Mode Cleaner ~65% Throughput 4.5 MHz bandwidth Optically Cemented Higher body resonance Hermetically sealed LIGO-G010070-00-D Lasers and Optics Working Group

Lasers and Optics Working Group Intensity Noise Old Pre-Mode Cleaner Old Laser LIGO-G010070-00-D Lasers and Optics Working Group

Lasers and Optics Working Group Frequency Noise LIGO-G010070-00-D Lasers and Optics Working Group

Lasers and Optics Working Group Mirror Mounts New Focus Centre 840 Hz ??? New Focus Corner 840 Hz ??? Newport Ultima 100 (“open”) with 1” post -580 Hz Opto Sigma Ultra Stable 400 Hz Fixed Periscope 610 Hz Fixed “Sovietski” 1.4 kHz Ultima 100 with pyramid base 590 Hz Ultima AC (“closed”) with pyramid base 850Hz Micro Controle 730 Hz LIGO-G010070-00-D Lasers and Optics Working Group

Lasers and Optics Working Group Future Intensity Stabilization (ISS) must still be implemented Tidal servo must still be implemented New table layout Study acoustic environment LIGO-G010070-00-D Lasers and Optics Working Group