If you followed the theoretical deep dive in our last log,Spectrometer Design Part 8: Calculating Optimal Slit Width, you know that determining the entrance slit width (w) is the final, crucial step in the optical design of the JASPER spectrometer. This single parameter defines the fundamental trade-off: light throughput vs. spectral resolution.

To make setting this parameter effortless for any design, we're excited to announce the release of the interactive tool:

The JASPER VIS/NIR Optimal Slit Width Calculator

What the Tool Does

This online calculator instantly computes the ideal slit width based on your design goals, ensuring your system's resolution is perfectly matched to your detector's pixel size.

The calculator:

1. Explains the Math: It visually walks you through the four key steps (from the desired spectral resolution Δλ to the final equation) that were derived in the previous log.
2. Solves the Equation: It uses the final derived formula, which elegantly links the physical slit width to your core design parameters: 

Where:

• m = Diffraction Order
• Δλ = Target Spectral Resolution
• L_C = Collimating Lens Focal Length
• d = Grating Groove Spacing
• β = Diffraction Angle

 3. Provides an Interactive Interface: Just plug in your desired design values for spectral resolution, collimating lens focal length, grating grooves, and angle, and it instantly spits out the optimal slit width in micrometers (μm).

🖱️ Use the Calculator Now!

Whether you're building a JASPER or designing your own grating-based spectrometer, this tool will save you hours of manual calculation and help you lock in that perfect balance between light collection and spectrum clarity.

👉 Find the live tool here:

Jasper VIS/NIR Slit Width Calculator

https://checkag.github.io/Jasper_VIS_NIR_Slit_Width/