Report :

LN crystal, which is used to modulate Q switch, photoelectric modulation, frequency doubling, 

optical parametric oscillation, and a certain amount of iron and other metal impurities, 

can be used as holographic recording medium. It is also used for phase regulator, 

phase grating regulator, large scale integrated optical system. Also widely used in infrared detectors,

 high frequency wide band filter, etc.. As a kind of piezoelectric, ferroelectric, electro-optic, nonlinear optical,

 thermoelectric and other performance materials, it is used in surface acoustic wave technology. Holographic recording medium