Bauteile für Nd:YAG / Nd:YVO4 Laser

• HR cavity and turning mirrors with R > 99.9 % at AOI = 0° and at AOI = 45° for s- and p-polarized light
• Typical reflectivity: R > 99.95 %
• For special demands we guarantee R > 99.99% (delivery with cavity ring down measurement)
• Spectral bandwidth of about 70 nm, 1-on-1 LIDT > 50 MW/cm² (cw) and > 50 J/cm² (10 ns)

Figure 1: Reflectance spectra of a high power cavity mirror (a) and of output couplers with different degrees of reflectivity (b)

Beam Splitters and Output Couplers with precisely adjusted degree of Reflectivity

Figure 2: Reflectance spectra of a pilot mirror HR(1064 nm) + PR(630 – 670 nm) for s-, p- and random polarization at AOI = 45° (a) and for random polarization at different AOI (for use as scanning mirror) (b)

• Pump mirrors HR(0°, 1064 nm) > 99.9 % + R(0°, 808 nm) < 2 %
• Beamsplitters, beamcombiners and scanning mirrors
• Optics for the harmonics of the Nd:YAG / Nd:YVO4 laser are presented at our sites 2^nd-harmonics, 3^rd-harmonics and higher-harmonics

• Separation of the s- and p-polarized component of the light (s-polarized light is reflected and p-polarized light is transmitted)
• TFPs can be produced for AOI > 40°, but polarization is most efficient and appears in a broad wavelength range if AOI ≈ 55° (Brewster angle) is used
• Typical polarization ratio: Tp/Ts > 500 for AOI = 45° or 55°
• Special designs with a polarization ratio of Tp/Ts up to 10000 are possible
• High laser damage thresholds (useful for intra cavity applications
• The transmission of thin film polarizers for p-polarized light can be measured with high accuracy by a modified cavity ring down setup

Figure 3: Reflectance spectra of a pilot mirror HR(1064 nm) + PR(630 – 670 nm) for s-, p- and random polarization at AOI = 45° (a) and for random polarization at different AOI (for use as scanning mirror) (b)

• Beamsplitters with Rs ∼ Rp(|Rs – Rp| < 1.5 %) for AOI = 45° and different degrees of reflectivity
• Most common types:
  • R_s,p = 66 ± 1 %
  • R_s,p = 50 ± 2 %
  • R_s,p = 33 ± 3 %
• All nonpolarizing beamsplitters with rear side AR(Rs ∼ Rp ≤ 0.6 %)

Figure 4: Reflectance spectra of 3 types of nonpolarizing beam splitters (AOI = 45°)