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--- song_spectrograph [2024/08/10 19:49] – [Prism] jasonj
+++ song_spectrograph [2025/06/08 23:05] (current) – [Echelle grating] jasonj
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+{{:wiki:solar_spectrum_logo_11.png?400 |}}
 ====== The SONG spectrograph ======
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 {{::spec:optical_design.png?direct&400 |}}
-The basic optical design of the SONG spectrograph is pictured here. The light from the telescope exits a fiber and is focused onto a 50 micron slit. It then gets collimated by an [[song_spectrograph#off-axis parabolas|off-axis parabolic]] (OAP) mirror (CM1) before reaching the [[song_spectrograph#echelle grating|diffraction grating]].  After recollimation at the second OAP (CM2) it gets further dispersed by a prism before forming an image that falls on the detector after reimaging by an optical camera. The overall design is extremely compact.
+The basic optical design of the SONG spectrograph is pictured here. The light from the telescope exits a fiber that is positioned vertically. The light is focused onto a 50 micron slit. It then hits FM1 at a 45 degree angle to the vertical. Then it gets collimated by an [[song_spectrograph#off-axis parabolas|off-axis parabolic]] (OAP) mirror (CM1) before reaching the [[song_spectrograph#echelle grating|diffraction grating]].  After recollimation at the second OAP (CM2) it gets further dispersed by a prism before forming an image that falls on the detector after reimaging by an optical camera. The overall design is extremely compact.
   * SONG spectrograph technical design {{ :spec:spec:files:song3_spectrograph_-_optical_design_report_-_reva.pdf |report}} (7/2024)
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-  * The efficiency curves from Richardson Gratings testing are {{ :spec:spec:files:grating_efficiency_curves.pdf |here}}.
+  *  {{ :spec:spec:files:grating_efficiency_curves.pdf |Efficiency curves from Richardson Gratings testing }}
-  * The Zygot measurements are {{ :spec:spec:files:grating_zygot.pdf |here}}.
+  * {{ :spec:spec:files:grating_zygot.pdf |Zygot measurements}}.
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 Related documents
-  * Technical design drawings and specs {{ :docs:oc23040-prp-00001_signedos.pdf |file}}.
+  *  {{ :docs:oc23040-prp-00001_signedos.pdf |Technical design drawings and specs file}}.
-  * Detailed engineering drawing of mirror {{ :docs:song3_oap_370_rev2.pdf |file}}
+  * {{ :docs:song3_oap_370_rev2.pdf |Detailed engineering drawing of mirror file}}
   * When the parent mirror was polished, some edge effects were produced by the CNC machine.The remedy was to reduce the aperture 356 mm to 348 mm. The details are in this {{ :docs:song_apo_oap.pdf |report}}.
 ==== Flat mirrors ====
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 ==== Prism ====
-The prism blank was manufactured by Schott and polished by Vertex. It is made of [[https://www.schott.com/shop/advanced-optics/en/Optical-Glass/SF6/c/glass-SF6#:~:text=A%20classic%20glass%20type%20with,component%20for%20outstanding%20optical%20properties.| SF6]] material.
+The prism blank was manufactured by Schott. It is made of [[https://www.schott.com/shop/advanced-optics/en/Optical-Glass/SF6/c/glass-SF6#:~:text=A%20classic%20glass%20type%20with,component%20for%20outstanding%20optical%20properties.| SF6]] material.
+The polishing of the prism was carried out by Vertex Optics.
 The first polish resulted in a cracked prism.
 {{ :spec:spec:prism:sidewall_2.jpg?direct&200| (Sad) }}
-  * Prism specifications {{ :spec:spec:files:nmsu_prism_blank_specs.pdf |document}}
+  * {{ :spec:spec:files:nmsu_prism_blank_specs.pdf |Prism specifications document}}
+  *  {{ :spec:spec:files:signed_waiver_10030_282_01_rp_.pdf |Specification waiver}}
@@ Line 86: / Line 91: @@
 ==== Optical camera ====
+The camera has an Italian-made [[https://www.primalucelab.us/|Prima Luce Lab]] Esatto focuser ({{ :spec:spec:files:esatto-en-user-manual.pdf |instruction manual}}).
-  * Optical camera design {{ :spec:spec:files:song_000_optical_camera.pdf |document}}
+The focuser settings ...
+  * {{ :spec:spec:files:song_000_optical_camera.pdf |Optical camera design document}}
+  * {{ :spec:spec:files:song_apo_optical_test_results.pdf |Optical test results}} with interferometer (02/25)
+  * {{ :spec:spec:files:song_002_central_body.pdf |Camera body dimensions}}
 ==== Detector ====
 We have chosen to use the [[https://www.qhyccd.com/scientific-camera-qhy600pro-imx455/|QHY600 Pro]] detector with the liquid cooling option.
+===== Alignment diagrams =====
+ * {{ :spec:spec:files:song_apo_spectrograph_alignment_info_v2.pdf |Alignment document}}