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MgO:LN Crystal
Advantages of MgO:LiNbO3 compared with pure LiNbO3
• Higher frequency doubling (SHG) efficiency for pulsed Nd:YAG (65%) and CW Nd:YAG (45%)
• Higher performance in applications of OPO, OPA, QPM doublers and integrated waveguide
• Much higher photorefractive damage threshold
Features of MgO:LiNbO3
High homogeneity
WidetTransparency range
High value of damage threshold
Good electro-optical properties
Good photoeleastic properties
Pure LiNbO3 (LN) is a good candidate for various optical devices, but has a major disadvantage due to its low threshold optical damage. MgO:LN (congruent compositions) is one of the possible solutions to deal with this problem. MgO doping has played an important role in LN and shown an increased threshold laser beam strength by 100 times. An interesting point is that every physical property of MgO:LN (e.g. transition temperature, activation energy, optical band , optical absorption spectra, shift of OH- vibration frequency, density, and electric activation energy) has threshold composition at just above 5 mol% of MgO concentration.
Specifications of MgO:LN components:
(Typical doping ratio: 5%)
| Wavefront distortion: less than λ/6 @ 633 nm |
| Dimension tolerance: (W +/- 0.1 mm) x (H +/- 0.1 mm) x (L + 0.2/-0.1mm) |
| Clear aperture: > 90% central area |
| Flatness: λ/8 @ 633 nm |
| Surface Quality: Scratch/dig 20/10 per MIL-O-13830A |
| Parallelism: better than 20 arc seconds |
| Perpendicularity: 5 arc minutes |
Angle tolerance: Δθ < +/-0.25o, Δφ < +/-0.25o |
Applications of MgO:LiNbO3
Waveguide modulator
As a Q-switching in Nd: YAG lasers
Being used in frequency doubling at room temperature for 1064nm laser light
Range finder
Laser radar
Mobile telephones
