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Current status of Laser development

Current status of Laser development. 2nd Korea - Japan Workshop on KAGRA 2012/5/28(Mon). Collaboration items. High power amplifier Pre-stabilization with fiber ring cavity. Current status of the collaboration. To start definite collaboration, we need some financial support.

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Current status of Laser development

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  1. Current status ofLaser development 2nd Korea - Japan Workshop on KAGRA 2012/5/28(Mon)

  2. Collaboration items • High power amplifier • Pre-stabilization with fiber ring cavity

  3. Current status of the collaboration • To start definite collaboration, we need some financial support. • Prof. Yoon submitted his proposal concerning a high-power PCF fiber amplifier to Korean government. • Mio submitted his proposal to Mitsubishi foundation with Prof. Yoon. We are waiting for good news!

  4. Overview: Definition of Laser Subsystem • Laser subsystem consists of a laser oscillator, a power supply, a tiller, control systems and monitor systems and an optical table. Power supply 3fAC200V1fAC200V 1fAC100V DC/AC Monitor signals Laser Oscillator InputOptics Cooling water Chiller Laser output Circulating cooling water 3fAC200V Control signals Clean room

  5. bKagra: Target specifications

  6. Schematic diagram The output of the NPRO is lead to two fiber amplifiers. Two outputs of the amplifiers are coherently added to obtain 80-W power. The laser light is introduced into three-stage solid-state amplifiers in order to obtain 180-W output power. 200 W 80 W Mitsubishi laser modules Fiber laser amplifiers 40 W NPRO(500mW) 40 W

  7. Current Statusfor parts preparation Power Supply Chiller 200 W Mitsubishi laser modules Delivery of the amplifiers is delayed because of a trouble on Faraday isolators that are set at the output fibers. 80 W Fiber laser amplifiers 40 W FR NPRO(500mW) 40 W FR All components have been obtained and will be tested.

  8. bKAGRA:Prototype test • Performance of the fiber amplifier • 40-W one is being tested. • Performance of the coherent addition system • The fringe contrast, phase stability and so on will be tested sonn. • Performance of the laser module when used as an amplifier. • Optimization of the beam profile for obtaining the best amplification performance. • Polarization stability, noise level should be tested; not started. • Fix the specifications for the control system (interfaces to a PC and other systems) • Discussion about the assembling with a company is necessary . 8

  9. After the 1st Workshop • No fiber amplifiers have not been delivered to us at the first workshop. • One laser system was delivered to our lab in the middle of Feburuary. • We have tested its phase noise using an interferometer.

  10. Intensity Noise Relative Intensity Noise 10-W Amplifier Frequency (Hz)

  11. Phase Noise Measurement

  12. Measurement System Amplified laser light PZT Mirror Seed laser light Control Circuit

  13. Phase Noise Phase Noise Frequency (Hz)

  14. New lab@Hongo We moved our lab from Kashiwa to Hongo in March. Most of our experimental systems are still in boxes.

  15. Laser Development @ Hongo • Phase noise measurement has been started. • We decided not to use a fiber-coupled Faraday isolator. • Two lasers will be available in June; a coherent addition system can be tested soon.

  16. Summary • The performance of the 40-W fiber amplifier is not so good as 10-W one; we need further investigation. • Choice of fiber coupled optical devices for high power laser should be careful ; the heat due to the light loss is quite serious.

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