Weak Nd:YAG or Nd:YVO₄ Laser Lines (915 nm, 946 nm, 1123 nm, 1340 nm)

Neodymium doped crystals exhibit laser transitions at different wavelengths. Table 1 and Table 2 give an overview about the laser wavelengths of the most common Nd-doped materials Nd:YAG and Nd:YVO₄.

Laser Lines	Second Harmonic
946 nm	473 nm
1064 nm	532 nm
1123 nm	561 nm
1319 nm	659 nm
1338 nm	669 nm
1415 nm	708 nm
1444 nm	722 nm

Laser Lines	Second Harmonic
915 nm	457 nm
1064 nm	532 nm
1342 nm	671 nm

A variety of laser lines in the VIS and NIR can be obtained from these crystals. This process is utilized to build compact diode pumped solid state lasers with a variety of wavelengths which are used for measurement applications as well as for projection systems (RGB lasers).

The strongest laser transition in both materials is the 1064 nm line. Efficient laser radiation at other wavelengths is only possible by suppressing this line. LAYERTEC offers a variety of laser mirrors for this application.

Compact laser designs also include the pump diode (808 nm) and a unit for the second harmonic generation. This is the reason why coatings for Nd:YAG or Nd:YVO₄ wavelengths apart from 1064 nm mostly show several spectral regions of high transmittance as well as high reflectance. All coatings are designed according to customer specifications, because the specifications depend on the laser design. All examples on these pages are for Nd:YAG wavelengths. Coatings for Nd:YVO₄ can be designed and produced as well.

Feature	Reflectance
Suppression of the strongest laser line	R (0°, 1064 nm) < 5 %
HR mirror for the weak laser line	R (0°, 946 nm) > 99.95 %
High transmittance for the pump wavelength	R (0°, 808 nm) < 2 %
HR mirror for the second harmonic of the weak laser line	HR (0°, 473 nm) > 99.85 %

Feature	Reflectance
HR mirror for the weak laser line	HR (0°, 1123 nm) > 99.9 %
Suppression of the strongest laser line	R (0°, 1064 nm) < 50 %
High transmittance for the pump wavelength	R (0°, 808 nm) < 10 %
High transmittance for the second harmonic of the weak laser line	R (0°, 561 nm) < 2 %

Feature	Reflectance
HR for s-polarized light of the weak laser line	HRs (56°, 1123 nm) > 99.9 %
Suppression of p-polarized light of the weak laser line	Rp (56°, 1123 nm) < 50 %
Suppression of the strongest laser line	Rs,p (56°,1064 nm) < 50 %
High transmittance for the pump wavelength	Rs,p (56°, 808 nm) < 10 %
High transmittance for the second harmonic of the weak laser line	Rs,p (56°, 561 nm) < 10 %

Feature	Reflectance
Broadband HR mirror for several laser lines	HR (0°, 1064 nm + 1123 nm + 1319 nm) > 99.9 %
High transmittance for the second harmonics of these laser lines	R (0°, 532 – 561 nm + 659 nm) < 2 %