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Oscillator stability & ASE Reduction

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Presentation on theme: "Oscillator stability & ASE Reduction"— Presentation transcript:

1 Oscillator stability & ASE Reduction
Xiangyu Zhou 20. Nov. 2015

2 Layout Upgrade laser system, underground
Yb-doped fiber & Thin-disk 1030 nm New laser system, on the ground Yb-doped fiber & Rod 1064 nm

3 Old underground laser system
nm Yb-doped fiber oscillator with Transmission grating Yb-doped fiber pre amplifier Transmission grating pair stretcher Yb-doped fiber pre amplifier 51.9 MHz 2, 5, 25, 50 Hz Single or Double bunch nm Synchronization system Yb-doped fiber main amplifier Yb-doped fiber main amplifier Pulse picker 2856 MHz trigger From Accelerator Yb:YAG thin-disk regenerative amplifier Yb:YAG thin-disk multipass amplifier RF GUN SHG SHG

4 New underground laser system
nm Yb-doped fiber oscillator with Transmission grating Yb-doped fiber pre amplifier Transmission grating pair stretcher Yb-doped fiber pre amplifier Pulse picker 51.9 MHz 10 MHz 2, 5, 25, 50 Hz Single or Double bunch nm Synchronization system Yb-doped fiber main amplifier Yb-doped fiber main amplifier Pulse picker 2856 MHz trigger From Accelerator Yb:YAG thin-disk multi-pass cavity amplifier Yb:YAG thin-disk multipass amplifier ×3 RF GUN SHG SHG

5 Fiber pre-amplifier Reduce the ASE Increase the amp efficiency
All the fibers are coupled LD Pump SMF WDM coupler nm Yb-doped fiber Splitter Coupler 50% 70% 30% 15% 35% 50%

6 The issue in pulse picker
E.O. voltage 51.98 MHz 96 ns Double bunch Intensity Modulator：　NIR-MX-LN-10 10 MHz 51.98 MHz

7 Semiconductor Optics amplifier (SOA) Pulse Picker
Discriminator Gate generator 1 Gate generator 3 Level adapter Gate generator 2 Reference signal 10MHz SOA input signal generation

8 Semiconducter Optics amplifier (SOA) Pulse Picker
Input: 3 mW Output: 3 mW 52 MHz  MHz Cut & Soldering SOA chip mount SOA HI-27dB (Innolume)

9 Oscillator output Spectrum Pulse train * Broadband and Stable
* Repetition frequency : 51.9MHz Output power 8.2mW

10 Yb single mode fiber amp (3stage) output
Spectrum Pulse train * Wavelength Center : 1030nm , FWHM : 2nm * Repetition frequency : 10MHz Output power 85mW

11 Yb-doped PCF amp & EO module Pulse picker

12 1030nm Fiber laser system Improvement
Increase the stability of oscillator Reduce the ASE of pre-amplifier Increase the amp efficiency Reduce the noise signal of 52 MHz (Pulse picker)

13 Yb fiber laser system on the ground
Fiber part Repetition frequency 114.24MHz Wavelength selection 1030nm & 1064nm Repetition frequency 10MHz 1064nm oscillator (ANDi type) Grating stretcher (Transmission) SOA pulse picker Yb single mode fiber amp Menlo 1030nm oscillator Yb-doped double clad fiber amp ASE rejection grating pair 1030nm oscillator (ANDi type) 1064nm 1030nm EO module pulse picker Repetition frequency : 10Hz Yb:YAG Thin disk regenerative amplifier 1064nm Nd:YAG regenerative amplifier Output(1030nm) Output(1064nm)

14 Produce from Menlosystems
ORANGE-Comb-250 nm ~30mW 1-4ps 114.24MHz&2,856MHz SYNCRONIZATION Purchase commercial components

15 New design Oscillator Yb-doped Fiber Oscillator Self-similar
Breathing ratio　>100 All-normal-dispersion (ANDi) Oscillator Dissipative Soliton Breathing ratio　<10

16 Oscillator for 1030 nm Output power > 130mW CW oscillation
Modelock oscillation Bandpass filter: Semrock 1030nm (LL ) • Tabs > 90% 1030 nm • FWHM of 3.9 nm Output power > 130mW

17 1064nm Oscillator (ANDi type)
Bandpass filter: Semrock 1064nm (LL ) • Tabs > 90% 1064 nm • FWHM of 3.9 nm 1064nm oscillator (ANDi type) Pump power [mW] (LD current [mA]) Output power [mW] 460 (700) 75.2 Pulse train Spectrum

18 The spectrum of the oscillators
◆High output power ◆ Tunable center wavelength

19 Selection of Oscillator
Menlo oscillator orange ANDi oscillator 1064nm 1030nm Output: Selection of oscillator

20 Grating stretcher Simplified schematic

21 Yb single mode amp output
SOA pulse picker & Yb single mode fiber amp SOA pulse picker 1030nm 1064nm Repetition frequency : 10MHz ASE of SOA Yb single mode fiber amp SOA input [μW] SOA output Yb single mode amp output [mW] 1030nm 330 400 135 1064nm 250 710 46

22 Grating pair for ASE remove @ 1064nm
1064nm pulse train Before (power : 82mW) After (power : 46mW) ASE spectrum of SOA

23 Yb-doped double clad fiber amp
Output power : 1.0 W (Pump power : 4W) Pulse train Spectrum

24 Fiber laser system layout on the ground
3 oscillators (100 MHz) 2 fiber system for 1030nm/1064nm SOA pulse picker Yb-doped fiber amplifier (~1.0 W)

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