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Broadband fs laser optics

Broadband Femtosecond Laser Optics (Bandwidth ∼300nm)

The coatings shown here are calculated for the wavelength range 700 - 1000 nm. Similar coatings are available for 600 - 900 nm and 650 - 950 nm
Very high reflectivity of the mirrors (R > 99.8% … R > 99.95% depending on the design)
Centre wavelength, bandwidth, GDD and TOD according to customer specification
Spectral tolerance 1% of centre wavelength
LIDT ≈ 0.1 J/cm²
In-house design calculation and GDD measurement capabilities

Negative Dispersion Laser Mirror Pair

Figure 1: Reflectance (a) and GDD (b) spectra of a negative dispersion laser mirror pair

Mirror pairs show a very smooth average GDD spectrum, although the single broadband mirrors exhibit strong GDD oscillations. Pump mirror pairs (i.e. mirror pairs with at least one mirror showing high transmission around 500 nm) are also available.

Negative Dispersion Pump Mirror Pair

Figure 2: Reflectance (a) and GDD (b) spectra of a negative dispersion pump mirror pair

Broadband Mirror Pair with Positive Average GDD

Figure 3: Reflectance (a) and GDD (b) spectra of a broadband mirror pair with positive average GDD for s-polarized light at AOI = 30°

Broadband Negative Dispersion Turning Mirrors

Figure 4: Reflectance (a) and GDD (b) spectrum of a broadband turning mirror for s - polarized light

Figure 5: Reflectance (a) and GDD (b) spectrum of a broadband turning mirror for p - polarized light

Broadband Output Couplers

Figure 6: Reflectance (a) and GDD (b) spectra of several broadband output couplers. The GDD spectra are similar for all these components. Figure 6b shows the GDD spectra for the 80% output coupler.

Broadband Beam Splitters

Figure 7: Reflectance spectra of several broadband beam splitters for p- (a) and s - polarization (b). The GDD values for reflected and transmitted light are in the range of ± 30 fs²