Активные элементы Nd:YAG

Yb:YAG shows great promise as a high power laser material. Several applications are being developed in the field of industrial lasers, such as metal cutting and welding. With high quality Yb:YAG now available, additional fields and applications are being explored.

Yb:YAG's advantage is a wide pump band and an excellent emission cross section. It is ideal for diode pumping. The broad absorption band enables Yb:YAG to maintain uninterrupted pump efficiency across the typical thermal shift of diode output. High efficiency means a relatively small dimension Yb:YAG laser crystal will produce high power output. Based on the YAG host crystal, Yb:YAG can be quickly integrated into the laser design process. This combination of properties enables straightforward elegant laser designs, and allows high powered lasers to be manufactured more easily ; Yb:YAG. Laser designers can apply their depth of experience.

We offer excellent quality Yb:YAG laser crystals as both rods and discs that meet your exact specifications. Our experienced staff, can work with you to bring out the superior performance of your high power 1 micron output laser system.

Applications

  • With a wide pump band and excellent emission cross-section Yb:YAG is an ideal crystal for diode pumping.
  • High Output Power 1.029 1mm
  • Laser Material for Diode Pumping
  • Materials Processing, Welding and Cutting

Yb:YAG is a good laser gain material which has a much larger absorption bandwidth. It can generate 1.03µm laser output pumped at 0.94µm. Yb:YAG can be used in high power diode-pumped lasers and others potential applications.

Yb:YAG is one of the most promising laser-active materials and more suitable for diode-pumping than the traditional Nd-doped systems. Compared with the commonly used Nd:YAG crystal , Yb:YAG crystal has a much larger absorption bandwidth to reduce thermal management requirements for diode lasers, a longer upper-laser level lifetime, three to four times lower thermal loading per unit pump power. Yb:YAG crystal at 1030nm is a good substitute for a Nd:YAG crystal at 1064nm and its second harmonic at 515nm may replace Ar-ion laser(with a large volume),which emit at 514nm.

Advantages of Yb:YAG Crystal:

  • Very low fractional heating, less than11%;
  • Very high slope efficiency;
  • Broad absorption bands, about 8nm@940nm;
  • No excited-state absorption or up-conversion;
  • Conveniently pumped by reliable InGaAs diodes at 940nm(or 970nm);
  • High thermal conductivity and large mechanical strength;
  • High optical quality

Material and Specifications

Dopant concentration Yb: 5~15 at%
Wavefront Distortion ≤ 0.125λ/inch
Extinction Ratio ≥28 dB
Rod Sizes Diameter:2~20mm,Length:5~150mm
Upon request of customer
Dimensional Tolerances Diameter:+0.00"/-0.002"mm,
Length: ± 0.02"
Barrel Finish Ground Finish: 400# Grit
Parallelism ≤10"
Perpendicularity ≤5′
Flatness λ/10
Surface Quality 10/5(MIL-PRF-13830B)
Chamfer 0.006"±0.002" at 45°± 5°
AR Coating Reflectivity ≤ 0.25% (@1030nm)
Single pass loss <3×103cm-1

Optical and Spectral Properties of Yb:YAG Crystal

Laser Transition 2F5/2→2F7/2
Laser Wavelength 1030nm
Photon Energy 1.93×10-19J(@1030nm)
Emission Linewidth 9nm
Emission Cross Section 2.0×10-20cm2
Fluorescence Lifetime 1.2 ms
Diode Pump Band 940nm or 970nm
Pump Absorption Band Width 8 nm
Index of Refraction 1.82
Thermal Optical Coefficient 9×10-6/℃
Loss Coefficient 0.003 cm-1