Bauteile für Nd:YAG / Nd:YVO4 Laser

Mirrors and Partial Reflectors

  • 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 > 50J/cm2 (10 ns)
high power cavity mirrorFigure 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

pilot mirror HR (1064 nm) + PR (630 – 670 nm)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)
ReflectanceTolerance
R > 95%± 0.5%
R = 80 ... 95%± 1%
R = 10 ... 80%± 2%
  • Pump mirrors HR (0°, 1064 nm) > 99.9% + R (0°, 808 nm) < 2%
  • Beam splitters, beam combiners and scanning mirrors
  • Optics for the harmonics of the Nd:YAG / Nd:YVO4 laser are presented here, here and here (also on pages 40 - 45 in our catalog)

Thin Film Polarizers

  • 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
pilot mirrorFigure 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)

Nonpolarizing Beam Splitters

  • Beamsplitters with Rs ∼ Rp (|Rs – Rp| < 1.5%) for AOI = 45° and different degrees of reflectivity
  • Most common types:
    • Rs,p = 66 ± 1%
    • Rs,p = 50 ± 2%
    • Rs,p = 33 ± 3%
  • All nonpolarizing beamsplitters with rear side AR (Rs ∼ Rp ≤ 0.6%)
nonpolarizing beam splittersFigure 4: Reflectance spectra of 3 types of nonpolarizing beam splitters (AOI = 45°)