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The Laser Box position on SOAR

At 67.5Deg from IR Nasmyth. IR Nasmyth. Optical Nasmyth. The Laser Box position on SOAR.

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The Laser Box position on SOAR

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  1. At 67.5Deg from IR Nasmyth IR Nasmyth Optical Nasmyth The Laser Box position on SOAR Note: Laser umbilical cord of 7m has been tested. It can be laid out along the elevation ring passing directly to the cable ladder on the Nasmyth bearing and under the IR Nasmyth platform (tb/re-checked by SOAR team). SAM LGS-v1, Optics, 220507

  2. M6 M2 S-B-C B-E M3 Laser M1(pupil) 22.5deg M5 M3 M6 M4 Beam Propagation: Laser-line (broad band?) Mirrors Diameter=30mm, R~99%. Laser Box: Laser: JDSU Q301-HD B-E: Special Optics 61-30-2-8x-351 CA-in=10mm,out=30mm, $2450. S-B-C: Special Optics 8-500-UV-25 CA=25mm, $4150. Launch Telescope M1: R=1000mm, C=-0.970454, F=300mm. M2: R=30mm, C=0, F=9mm. The LGS system SAM LGS-v1, Optics, 220507

  3. Laser Beam Quality: M²<1.2  TEM00 purity better than 90% Waist (TEM00)=0.13mm B-E magnification = 4x, places parallel beam waist =4mm on LLTM2. LLT magnification = 33.32x places waist image = 39.4mm at 10km. Mixed Mode results for M2 = 1.2000: Sur Size Waist Position Radius Divergence Rayleigh LLTm2 44 2.14217E+000 2.14217E+000 -4.27749E-004 -2.67736E+012 6.33003E-005 3.38414E+004 LGS IMA 1.97396E+001 1.97396E+001 -5.87887E-003 -1.40456E+015 6.86944E-006 2.87354E+006 Note: B-E of 8x degrades LGS IQ (though still diffraction limited) but has the advantage of lower energy density on beam propagation mirrors. The Laser beam and Spot Characteristics SAM LGS-v1, Optics, 220507

  4. p=p/2 Polarization Strategy Laser Linear l/4 Nasmyth Circular l/4 Linear WFS module Expected Residual Ellipticity: de-phase in SAM common path (tb/measured). SAM LGS-v1, Optics, 220507

  5. LGS delivery System Tolerances SAM LGS-v1, Optics, 220507

  6. 2.3mm 1.3min SOAR flexure: LLT Tilt and Decenter (the effect on image shift and quality) 2.3Arcsec SAM LGS-v1, Optics, 220507

  7. Input beam angle=+0.0134Deg; corrects +2.3mm of LLT displacement. LLT M1 tilt angle=-0.894Arcsec; corrects 2.3Arcsec of image shift. Displacement and Tilt correction 0.894”=2.167um actuator push-pull Conclusion: M6 and M4 motorized tip-tilt for easier alignment. Beam Active control: 4 diodes at the edge of LLTM1 close loop on M4. SAM LGS-v1, Optics, 220507

  8. To Do List • Define the beam transfer Mirrors now!. • The Alignment Plan and alignment tools. • Finish the Laser Box design (beam quality control and alignment gadgets). • The Optical Component List for PO. • The Documentation for PDR. SAM LGS-v1, Optics, 220507

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