NdYVO4 Crystals

NdYVO4 Crystals

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Common Specification:

Dopant:0.1% ~ 3%
Orientation:A-CUT +/-0.5°
Surface quality:10/5
Parallelism: ≤10″
Bevel: <0.2mmx45°

C1--- AR@1064(R<0.2%)
C2--- AR@1064(R<0.2%)&532(R<0.5%)
C3--- AR@1064(R<0.2%)&808(R<0.5%)
C4--- AR@1064(R<0.2%)&532(R<0.5%)&808(R<3%)
C5--- HR@1064(R>99.8%)&HT@808(T>95%)
C6--- HR@1064(R>99.8%)&532(R>99.5%)&HT@808(T>95%)

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What is NdYVO4 Crystal

Nd:YVO4 (neodymium-doped yttrium orthovanadate) is a crystalline material that is used as an active laser medium for diode-pumped solid-state lasers. It has many advantages over other laser crystals, such as high absorption coefficient, large stimulated emission cross-section, broad absorption bandwidth, low lasing threshold, high slope efficiency, low thermal conductivity, and good mechanical properties

Nd:YVO4 absorbs mostly in the bands between 730–760 nm and 790–820 nm, and can be efficiently pumped by laser diodes The typical lasing wavelength of Nd:YVO4 is 1064 nm, but there are also transitions near 914 nm, 1342 nm, and 1440 nm

Major Specifications of NdYVO4 Crystal

When ordering a Nd:YVO4 crystal from a supplier, you need to specify the following parameters:

  • Size and shape: The dimensions of the crystal rod or slab, such as diameter, length, width, and thickness. The shape can be cylindrical, rectangular, or custom-made.
  • Doping concentration: The percentage of neodymium ions in the crystal, usually ranging from 0.1% to 3%. The doping concentration affects the absorption coefficient, fluorescence lifetime, gain bandwidth, and thermal lensing of the crystal.
  • Crystal orientation: The direction of the optical axis of the crystal relative to its geometric axis. The crystal orientation can be a-cut (optical axis parallel to the geometric axis) or c-cut (optical axis perpendicular to the geometric axis). The crystal orientation affects the polarization and birefringence of the laser output.
  • Surface quality: The degree of smoothness and cleanliness of the crystal surfaces, usually measured by scratch-dig numbers or surface roughness. The surface quality affects the scattering and reflection losses of the crystal.
  • Surface flatness: The deviation of the crystal surfaces from a perfect plane, usually measured by peak-to-valley or root-mean-square values. The surface flatness affects the wavefront distortion and beam quality of the laser output.
  • Coatings: The thin layers of materials applied to the crystal surfaces to enhance or reduce the reflection or transmission of light at certain wavelengths. The coatings can be anti-reflection (AR), high-reflection (HR), partial-reflection (PR), or dichroic coatings. The coatings affect the efficiency and stability of the laser output.

NdYVO4 advantages Over NdYAG

Nd:YVO4 has several advantages over Nd:YAG (neodymium-doped yttrium aluminum garnet), another common laser crystal, such as:

  • Higher absorption coefficient: Nd:YVO4 has about four times higher absorption coefficient than Nd:YAG at 808 nm, which means it can be pumped more efficiently by laser diodes and requires shorter crystal length
  • Larger stimulated emission cross-section: Nd:YVO4 has about three times larger stimulated emission cross-section than Nd:YAG at 1064 nm, which means it has higher gain and lower lasing threshold
  • Broader absorption bandwidth: Nd:YVO4 has about six times broader absorption bandwidth than Nd:YAG at 808 nm, which means it can tolerate larger variations in pump wavelength and temperature
  • Higher slope efficiency: Nd:YVO4 has about two times higher slope efficiency than Nd:YAG at 1064 nm, which means it can produce more output power per unit pump power
  • Lower thermal conductivity: Nd:YVO4 has about one tenth lower thermal conductivity than Nd:YAG at room temperature, which means it has less thermal lensing effect and better beam quality
  • Better mechanical properties: Nd:YVO4 has higher fracture toughness and hardness than Nd:YAG, which means it is more resistant to mechanical damage and stress-induced birefringence

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