Oscillator stability & ASE Reduction Xiangyu Zhou 20. Nov. 2015.
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Transcript of Oscillator stability & ASE Reduction Xiangyu Zhou 20. Nov. 2015.
![Page 1: Oscillator stability & ASE Reduction Xiangyu Zhou 20. Nov. 2015.](https://reader036.fdocuments.in/reader036/viewer/2022081501/5697bff01a28abf838cbab68/html5/thumbnails/1.jpg)
Oscillator stability & ASE Reduction
Xiangyu Zhou
20. Nov. 2015
![Page 2: Oscillator stability & ASE Reduction Xiangyu Zhou 20. Nov. 2015.](https://reader036.fdocuments.in/reader036/viewer/2022081501/5697bff01a28abf838cbab68/html5/thumbnails/2.jpg)
Layout
Upgrade laser system, undergroundYb-doped fiber & Thin-disk Yb:YAG @ 1030 nm
New laser system, on the groundYb-doped fiber & Rod Nd:YAG @ 1064 nmYb-doped fiber & Thin-disk Yb:YAG @ 1030 nm
![Page 3: Oscillator stability & ASE Reduction Xiangyu Zhou 20. Nov. 2015.](https://reader036.fdocuments.in/reader036/viewer/2022081501/5697bff01a28abf838cbab68/html5/thumbnails/3.jpg)
Old underground laser systemYb-doped fiber oscillator with
Transmission grating
Yb-doped fiber pre amplifier
Yb-doped fiber main amplifier
Pulse picker
Yb:YAG thin-disk regenerative amplifier
Yb:YAG thin-disk multipass amplifier
SHG
Synchronization system
SHGRF GUN
51.9 MHz
2, 5, 25, 50 HzSingle or Double bunch
0.2 nJ @ 1037 nm
Yb-doped fiber main amplifier
Transmission grating pair
stretcher
2856 MHz triggerFrom Accelerator
Yb-doped fiber pre amplifier
>μJ @ 1037 nm
![Page 4: Oscillator stability & ASE Reduction Xiangyu Zhou 20. Nov. 2015.](https://reader036.fdocuments.in/reader036/viewer/2022081501/5697bff01a28abf838cbab68/html5/thumbnails/4.jpg)
New underground laser systemYb-doped fiber oscillator with
Transmission grating
Yb-doped fiber pre amplifier
Yb-doped fiber main amplifier
Pulse picker
Yb:YAG thin-disk multi-pass cavity amplifier
Yb:YAG thin-disk multipass amplifier ×3
SHG
Synchronization system
SHGRF GUN
51.9 MHz
2, 5, 25, 50 HzSingle or Double bunch
0.2 nJ @ 1037 nm
Yb-doped fiber main amplifier
Transmission grating pair
stretcher
2856 MHz triggerFrom Accelerator
Yb-doped fiber pre amplifier
>μJ @ 1037 nm
Pulse picker
10 MHz
![Page 5: Oscillator stability & ASE Reduction Xiangyu Zhou 20. Nov. 2015.](https://reader036.fdocuments.in/reader036/viewer/2022081501/5697bff01a28abf838cbab68/html5/thumbnails/5.jpg)
Fiber pre-amplifier
LD Pump
SMF
WDMcoupler
WDMcoupler
700 mW @ 976 nm
Yb-doped fiber
WDMcoupler
Splitter Coupler
Splitter Coupler
50%50%
70%30%
50%35%15%
• Reduce the ASE• Increase the amp efficiency• All the fibers are coupled
![Page 6: Oscillator stability & ASE Reduction Xiangyu Zhou 20. Nov. 2015.](https://reader036.fdocuments.in/reader036/viewer/2022081501/5697bff01a28abf838cbab68/html5/thumbnails/6.jpg)
The issue in pulse picker
INTENSITY MODULATOR : NIR-MX-LN-10
51.98 MHz10 MHz
51.98 MHz
Double bunch
96 ns
E.O. voltage
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Semiconductor Optics amplifier (SOA) Pulse Picker
SOA input signal generation
Discriminator Gate generator 1 Gate generator 3 Level adapter
Gate generator 2Reference signal10MHz
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Semiconducter Optics amplifier (SOA) Pulse Picker
Cut & Soldering
SOA-1020-110-HI-27dB (Innolume)SOA chip mount
Input: 3 mWOutput: 3 mW52 MHz 10.38 MHz
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Oscillator output
Spectrum Pulse train
* Broadband and Stable
Output power8.2mW
* Repetition frequency : 51.9MHz
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Yb single mode fiber amp (3stage) output
Spectrum Pulse train
Output power85mW
* Repetition frequency : 10MHz* Wavelength Center : 1030nm , FWHM : 2nm
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Yb-doped PCF amp & EO module Pulse picker
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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)
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Yb fiber laser system on the ground
Menlo1030nm oscillator
Grating stretcher(Transmission)
SOApulse picker
Yb single mode fiber amp
Yb-doped double clad fiber amp
Repetition frequency114.24MHz
Wavelength selection1030nm & 1064nm
Repetition frequency 10MHz
Nd:YAG regenerative amplifier
EO modulepulse picker
Repetition frequency : 10Hz Yb:YAG Thin disk
regenerative amplifier
1030nm oscillator(ANDi type)
1064nm oscillator(ANDi type)
Output(1030nm)
Output(1064nm)
ASE rejection grating pair
1030nm1064nm
1064nm
Fiber part
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Produce from MenlosystemsORANGE-Comb-250
• 1025-1050nm
• ~30mW
• 1-4ps
• 114.24MHz&2,856MHz
SYNCRONIZATION
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New design Oscillator
Dissipative Soliton
Self-similar
All-normal-dispersion (ANDi) Oscillator
Yb-doped Fiber Oscillator
Breathing ratio >100
Breathing ratio <10
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Oscillator for 1030 nm
CW oscillation Modelock oscillation
Bandpass filter: Semrock 1030nm (LL01-1030-12.5)• Tabs > 90% 1030 nm• FWHM of 3.9 nmOutput power > 130mW
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1064nm Oscillator (ANDi type)
1064nm oscillator(ANDi type)
Spectrum
Pump power [mW]
(LD current [mA])
Output power [mW]
460(700)
75.2
Pulse train
Bandpass filter: Semrock 1064nm (LL01-1064-12.5)• Tabs > 90% 1064 nm• FWHM of 3.9 nm
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The spectrum of the oscillators
◆High output power ◆ Tunable center wavelength
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Selection of Oscillator
Selection of oscillatorMenlo oscillator
orangeANDi
oscillator1064nm
ANDi oscillator1030nm
Output:30mW @Menlo110mW @1030nm75mW @1064nm
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Grating stretcher
Simplified schematic2nm@1030nm 0.5nm@1064nm
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SOA pulse picker & Yb single mode fiber amp
Yb single mode fiber amp
SOA input[μW]
SOA output[μW]
Yb single mode amp output
[mW]
1030nm 330 400 135
1064nm 250 710 46
SOA pulse picker
1030nm 1064nm
Repetition frequency : 10MHz ASE of SOA
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Grating pair for ASE remove @ 1064nm
ASE spectrum of SOA
1064nm pulse train
Before(power : 82mW)
After(power : 46mW)
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Yb-doped double clad fiber amp
Pulse train Spectrum
Output power : 1.0 W(Pump power : 4W)
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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)