He–Cd Line Selector
Select the nearer common He–Cd line to a requested wavelength.
Description
A He–Cd line selector chooses between two wavelengths embedded in the implementation: 325 and 442 nm.
A He–Cd line selector chooses between two wavelengths embedded in the implementation: 325 and 442 nm. Selection minimizes absolute detuning.1
Select the nearer common He–Cd line to a requested wavelength.
When to use He–Cd Line Selector
Use this tool to select the nearer common He–Cd line to a requested wavelength.
Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
How to use He–Cd Line Selector and understand its results
- Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
- Enter requestedWavelengthNanometers using the field table and calculation rules, then run the tool.
- Read selectedLineNanometers, detuningNanometers. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| requestedWavelengthNanometers | Requested wavelength (nm) | number; minimum: 0 | Required |
Enter nonnegative requested wavelength. Return selected line and absolute nm detuning; the 383.5 nm tie selects 325.
selected=nearest of [325,442] nm Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| selectedLineNanometers | Selected He–Cd line (nm) | number; minimum: 0 |
| detuningNanometers | Absolute detuning (nm) | number; minimum: 0 |
{
"input": {
"requestedWavelengthNanometers": 430
},
"output": {
"selectedLineNanometers": 442,
"detuningNanometers": 12
}
}Limitations and assumptions
No tolerance gate, full line catalog, output power or availability check is supplied.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Praseodymium Line Match: Match a requested wavelength to caller-supplied praseodymium fiber lines. For a complementary task, use Wavelength-Lock Selector: Select an absorption-cell, etalon, or hybrid wavelength lock from supplied requirements.
References
-
He–Cd Line Selector — tool.io
Similar or alternative tools
- Praseodymium Line Match
Match a requested wavelength to caller-supplied praseodymium fiber lines.
- Wavelength-Lock Selector
Select an absorption-cell, etalon, or hybrid wavelength lock from supplied requirements.