Use this laser calculation or lookup for a first-pass optics, pulse, beam, gain-medium, diode, fiber, or safety comparison under explicitly stated wavelength and operating conditions.

Bragg wavelength (nm)

Unstrained Bragg wavelength at the reference temperature.

Strain (µε)

Axial strain in microstrain (negative for compression).

ΔT (°C)

Temperature change from the reference in °C.

Compute fiber Bragg grating wavelength shift from axial strain and temperature change using the silica photoelastic and thermo-optic coefficients. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Shift (pm)

Wavelength shift in picometers (negative for blue shift).

New wavelength (nm)

Shifted Bragg wavelength.

• Laser behavior depends on wavelength, mode, coherence, pulse shape, beam quality, cavity and optical losses, material data, temperature, alignment, nonlinear effects, damage thresholds, and measurement definitions. Lookup values are not substitutes for current device data or laser-safety analysis.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Verify constants and limits with primary literature and manufacturer data, propagate tolerances, model the complete optical train, and apply the relevant laser safety standard.

• DFB Grating Period Calculator

  Compute the DFB grating pitch that satisfies the Bragg condition for a target wavelength and effective index.

• Raman Stokes Cascade Wavelengths

  Compute silica-fiber Raman Stokes wavelengths from a pump wavelength and integer cascade order using the 440 cm^-1 shift.

• III–V Alloy Band-Edge Wavelength Proxy

  Estimate a bulk-alloy band gap and corresponding band-edge wavelength for common III–V compositions. This material-composition proxy omits quantum confinement, well thickness, strain-induced band shifts, and operating-temperature corrections required for a quantum-well transition design.