What is the primary function of the Shelyak LISA near infrared kit?
This kit's function is to convert a standard Shelyak LISA spectrograph, originally designed for the visible spectrum (400-700nm), into an instrument optimized for near-infrared spectroscopy in the 650-1000nm range.
How does the LISA NIR kit adapt the spectrograph for infrared light?
The kit modifies the optical path in two key ways. It replaces the standard camera ring with an angled one to correct for chromatic aberration in the near-infrared, and it adds an order filter to eliminate spectral order overlap, which can contaminate data at these wavelengths.
If I use this LISA NIR kit, can I still observe H-alpha at 656nm?
Yes. The converted instrument's optimized range begins at 650nm, placing the critical Hydrogen-alpha emission line at 656.3nm well within its observational capability. Your LISA will remain a powerful tool for studying objects with strong H-alpha signatures.
What astronomical targets are ideal for a LISA spectrograph in the 650-1000nm range?
This range is excellent for studying cooler stars like M-type red dwarfs and carbon stars, which exhibit strong molecular absorption bands (e.g., Titanium Oxide) in the near-IR. It is also ideal for observing the Paschen series of hydrogen lines in the spectra of Be stars.
Is the installation of the LISA near infrared kit difficult?
The manufacturer states that the conversion is a "meticulous operation, requiring time and precision." This kit is recommended for users who are confident in their ability to make precise mechanical adjustments to sensitive optical instruments. It is not a quick, field-swappable accessory.
Can I easily switch my LISA back to the visible range after this conversion?
The conversion is not designed for rapid or frequent changes between visible and NIR configurations. Reverting the LISA spectrograph back to its original 400-700nm visible-light optimization would require a full reversal of the meticulous installation process.
