Semiconductor Edge Emitting Laser Cavity Length Calculator
Ideal Fabry–Perotedge-emitter length c/(2ngΔν) from independently identified adjacent longitudinal-mode frequencies and actual group index. Not infer physical cavity length from wavelength interval without conversion or use phase index.
Description
Longitudinal mode spacing can support an ideal Fabry–Perot cavity-length estimate.
When to use Semiconductor Edge Emitting Laser Cavity Length Calculator
Use this tool to obtain conditionalFabryPerotCavityLengthMeters from the supplied records using the stated calculation. Establish the device or material, operating point, units and independently applicable measurement or model calibration.
How to use Semiconductor Edge Emitting Laser Cavity Length Calculator and understand its results
- Establish the device or material, operating point, units and independently applicable measurement or model calibration.
- Enter actualLongitudinalModeFrequencySpacingHz, independentlyEstablishedGroupIndex, using the field meanings and rules below, then run the tool.
- Read result.conditionalFabryPerotCavityLengthMeters. Use the units and sign conventions below, and review any unknown records separately.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualLongitudinalModeFrequencySpacingHz | Actual longitudinal mode frequency spacing hz | number | Required |
| independentlyEstablishedGroupIndex | Independently established group index | number | Required |
Require positive longitudinal frequency spacing in hertz and group index. Divide vacuum light speed 299792458 m/s by twice their product. The caller supplies the applicable Fabry–Perot mode-spacing convention; no mode-family identification or dispersion fit is performed.
cavityLengthMeters=299792458/(2×groupIndex×modeSpacingHz) Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Qualified observed calculation or explicit reference | object |
| result.conditionalFabryPerotCavityLengthMeters | Vacuum light speed divided by twice group index times longitudinal mode-frequency spacing. | number |
{
"input": {
"actualLongitudinalModeFrequencySpacingHz": 100000000000,
"independentlyEstablishedGroupIndex": 3
},
"output": {
"result": {
"conditionalFabryPerotCavityLengthMeters": 0.0004996540966666666
}
}
}Limitations and assumptions
Device structure, material state, operating conditions and calibration determine applicability. The result does not infer missing physical parameters, verify a transport mechanism or validate a fabricated device model.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Extremely large composite outputs are rejected.
Alternative or Complementary methods
For a related step, use Semiconductor Quantum Well Laser Threshold Current Calculator: Quantum-well laser threshold depends on structure, well width and operating conditions. For a complementary comparison, use Semiconductor Laser Threshold Vs Cavity Length Calculator: Laser threshold current varies with cavity geometry and other device conditions.
References
-
Semiconductor Edge Emitting Laser Cavity Length Calculator — tool.io
-
SI defining constants: speed of light — National Institute of Standards and Technology
Similar or alternative tools
- Semiconductor Quantum Well Laser Threshold Current Calculator
Quantum-well laser threshold depends on structure, well width and operating conditions.
- Semiconductor Laser Threshold Vs Cavity Length Calculator
Laser threshold current varies with cavity geometry and other device conditions.