THz frequency range that can be generated with 30 micron thick GaP crystal, is 0.1 to 3 THz

Описание: For a 30 micron thick GaP crystal, the expected THz frequency range that can be generated is approximately 0.1 to 3 THz - request a quote for GaP crystals at [email protected]

1. Phase matching: The 30 micron thickness provides good phase matching conditions for THz frequencies up to around 3 THz when using common femtosecond laser wavelengths in the near-infrared (e.g. 800 nm).

2. Absorption: Thinner GaP crystals have lower THz absorption, allowing the generated THz radiation to propagate more effectively. The 30 micron thickness minimizes absorption losses up to ~3 THz.

3. Dispersion: The thin 30 micron crystal helps manage dispersion effects, which can limit the achievable THz bandwidth. This thickness supports a broader THz spectrum compared to thicker crystals.

4. Coherence length: The coherence length for a 30 micron GaP crystal is on the order of 100-300 microns, which is well-matched to the crystal thickness for efficient THz generation.

In practice, the lower end of the THz range (around 0.1 THz) is limited by the finite duration of the femtosecond laser pulses used to excite the GaP crystal. The upper end around 3 THz is constrained by factors like phase matching, absorption, and dispersion limitations of the relatively thin 30 micron crystal.

By comparison, thicker GaP crystals (e.g. 0.5-1 mm) could generate THz frequencies up to 5-6 THz, but with reduced bandwidth compared to the 30 micron case.