Second Harmonic of High Power Lasers on the Basis of Yb- and Nd-doped Materials (515 nm, 532 nm)

The harmonics of Yb- and Nd-based high power lasers are widely used material processing as well as for measurement applications. Moreover, the second harmonic of these lasers is often used as a pump source for Ti:Sapphire lasers. LAYERTEC offers a variety of optics for 532 nm: dual wavelength mirrors, separators, thin film polarizers and non-polarizing beam splitters, but also cavity optics for compact diode pumped lasers of different configurations. Coatings for 515 nm are available as well. All designs are calculated according to customer specifications.

Turning Mirror for the Second Harmonic and the Fundamental Wave

Fig.1:Reflectance spectra of a turning mirror for the second harmonic and the fundamental wave
HRs,p (45°, 532 + 1064 nm) > 99.9 %

Cavity Mirror for the Second Harmonic and the Fundamental Wave

Fig.2:Reflectance spectra of a cavity mirror for the second harmonic and the fundamental wave with high transmittance for the pump wavelength (808 nm)

Fig.3:Reflectance spectra of an HR mirror for 1064 nm with additional output coupler for 532 nm:
HR (0°, 1064 nm) > 99.9 % + R (0°, 532 nm ) = 99 % ±0.3 %

Separators for the Second Harmonic and the Fundamental Wave

Fig.4:Reflectance spectra of separators for the second harmonic and the fundamental wavelength:

a)HR (0°,1064 nm) > 99.9 % + R (0°, 532 + 808 nm) < 3 %

b)HRs,p (45°, 515 + 532 nm) > 99.8 % + Rs (45°, 1030 + 1064 nm) < 5 % + Rp (45°, 1030 + 1064 nm) < 2 %

Separators with different features are available according to customer specifications.

Thin Film Polarizers

Fig.5:Reflectance spectra of a thin film polarizer for 532 nm

The transmittance of thin film polarizers for p-polarized light can be measured in-house with high accuracy using a modified Cavity ring-down set-up.

Non-Polarizing Beam Splitters

Fig.6:Reflectance spectra of a non-polarizing beam splitter for 532 nm with Rs = Rp = 50 ±2 % (|Rs – Rp| < 3 %)

Coating on Nonlinear Optical Crystals

Fig.7:Reflectance spectrum of a dual wavelength antireflection coating on KTP for 532 nm and 1064 nm

Fig.8:Reflectance spectrum of a dichroic mirror on KTP:
HR (0°, 532 nm) > 99.98 % + R (0°, 1064 nm) < 0.2 % optimized for very high transmittance at 1064 nm

Nonlinear optical crystals are the key elements for frequency conversion. LAYERTEC offers a variety of coatings on crystals like KTP and lithium niobate. For more information about coatings on crystals see page Coatings on Crystal Optics (340 – 3000 nm).

Second Harmonic of High Power Lasers on the Basis of Yb- and Nd-doped Materials (515 nm, 532 nm)