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The Nd: Yag Laser


Nd:YAG Layout | Operations Data | Nd:YAG Statistics | Gun Hutch

 

CW phasemeter ( DC - 10 Hz bandwidth ) Shown over 48 hours

Current Status Capabilites

 - Photocathode and CO2 slicing fully available on-demand

  - Electron beam-synchronized optical pulses available for users

10 mJ, 14 ps @ 1064 nm in laser lab ( exclusive of slicing )

100 mJ, 10 ps @ 532 nm in laser lab or FEL room

50 mJ, 8 ps @ 266 nm in gun hutch and laser lab

  - Exceptional availability: deliver light ~130 days/year, for a total 1500 running hours.

  - High reliability: system typically ready for gun operation within minutes, including daily performance characterization.

Demonstrated ATF Laser Performance

Energy (dual pulse mode)  
UV on Cathode 0-50 mJ
IR at CO2 table 7mJ
Laser output:total IR 30mJ
    IR into 2w 5mJ/ pulse
    Green 1mJ/pulse
    UV 200 mJ
   
Repetition rate 1.5, 3 Hz
   
Pulse Duration (FWHW):  
    Oscillator IR 7ps
    Amplified IR 14 ps
    Green 10 ps
    UV 8 ps
   
Beam on cathode(FWHW): 0.2 -  3mm
   
Top-Hat Beam Profile Modulation (P-P) <20%
   
Shot-to-shot stability (rms):  
    Timing <0.2 ps
    Energy 2%
Pointing (Fraction of Beam) <0.3%
   
Drift (8 hour P-P)  
    Timing 1ps
    Energy <15%
    Pointing (fraction of beam) <1%

 

Time-Bandwidth Products, Inc. Nd:YVO4 Oscillator

  - Improved stability in both energy, phase, and pointing

  - High reliability reduces maintenance - realignment should be unnecessary

  - Old oscillator provides emergency backup in case of failure

 

  LWE-131 GE-100
Pulse duration (FWHM) 20 ps 7 ps
CW power ~65 mW (currently) 500 mW
Amplitude stability <0.3% (10kHZ-10 mHz) <0.2%
Pointing stability < 50 microradian <10 microradian
Phase stability

<1 ps p-p (minutes)

< 1ps/hour drift

<0.3 ps p-p (minutes)

< 0.5ps/hour drift
Estimated laserdiode lifetime > 30,000 hours* >10,000

*-has operated 36,000 hours

Diagnostics

Continuously on-line:

  - Scanning autocorrelator for oscillator monitoring

  - 14 CCD cameras for transverse mode and position measurements with beam profile analyzer

  - 5 pyroelectric energy measuring probes with pickoffs and calibrated readout*

  - 7 High speed silicon photodiodes

  - Laser-RF Phasemeter*

  - 16-channel thermocouple temperature monitoring

Additional

  - 2 ps resolution streak camera (Instrumentation Div.)

  - CW laser power meter

  - 2 GHz digital sampling oscilloscope

* - output available facility-wide

 

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Last Modified: December 3, 2007
Please forward all questions about this site to: Vitaly Yakimenko
 


DOE, Office of ScienceOne of ten national laboratories overseen and primarily funded by the Office of Science of the U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical, biomedical, and environmental sciences, as well as in energy technologies and national security. Brookhaven Lab also builds and operates major scientific facilities available to university, industry and government researchers. Brookhaven is operated and managed for DOE’s Office of Science by Brookhaven Science Associates, a limited-liability company founded by Stony Brook University, the largest academic user of Laboratory facilities, and Battelle, a nonprofit, applied science and technology organization.

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