Desktop Instrument for Measuring Boresight Error as a Function of Incident Angle

**Key Changes to Q&A:** - **Q1 expanded significantly**: Previously unanswered multi-part question now has detailed responses clarifying BSE performance flexibility, IR band requirements (4 μm and 10 μm specified), sample mounting configurations, thermal gradient temperature ranges, optical aperture constraints, atmospheric conditions (with note that sample must not be chemically altered), and heating approach flexibility. - **Q6 answer clarified**: Added explicit requirement that heating components cannot obscure optical aperture while maintaining BSE/BSES measurement capability for both mounted and unmounted samples. - **Q8 answer refined**: Emphasized that ambient conditions must be controlled to ensure reproducibility and prevent sample alteration—this is now an implicit requirement. - **Q9 answer added critical scope boundary**: "Thermal boundary conditions windows are outside the scope of this solicitation"—narrows acceptable approaches. - **New Q2**: Duplicate of Q1 with identical answers, now showing consolidated Q&A structure across multiple submissions.

Status changed from Pre-Release to Open

Q&A section updated

**Q&A Updates Summary:** Answers added to Q1-Q3 clarifying flexibility on window materials, refractive indices, thicknesses, and temperature gradient types—applicants must specify their approach's capabilities and limitations. Q4 added as duplicate of Q3 with identical answer. Q5 answered with two rejections: sealed windows forming isolated chambers and permanently sealed windows are both outside solicitation scope.

# Summary This Q&A clarifies technical design flexibility for applicants: window material/refractive index specs and thickness details may be proprietary, temperature gradients can be lateral or through-thickness, and applicants may propose permanent seals or designs creating isolated chambers—removing potential barriers to innovative optical window solutions.

New opportunity: Desktop Instrument for Measuring Boresight Error as a Function of Incident Angle