Nonlinear Crystals: LiSe

Nonlinear Crystals: LiSe


Nonlinear Crystals: LiSe

LiSe (lithium selenide) is a nonlinear crystal that can be used in laser technology for frequency conversion. LiSe has a relatively high nonlinear coefficient and a wide transparency range, making it suitable for some applications such as second harmonic generation (SHG) and sum frequency generation (SFG).

In SHG, the frequency of a laser beam is doubled by passing it through a LiSe crystal. This process can be used to generate light in the ultraviolet range, which has applications in areas such as fluorescence microscopy and laser spectroscopy.

SFG produces a new frequency that is the sum of two input frequencies. LiSe can be used in SFG to generate tunable visible and ultraviolet radiation, which has applications in microscopy, sensing, and imaging.

LiSe has a relatively low damage threshold and low thermal stability, which can limit its use in high-power laser applications or in environments with large temperature fluctuations. Additionally, LiSe is not as widely used as other nonlinear crystals like KTP or BBO, which can limit its availability and increase its cost.

Transparency range, µm 0.43  13
Point group mm2
Lattice parameters, Å a = 7.192, b = 8.412, c = 6.793 Å
Refractive indexes:
at 0.532 µm nx= 2.3185, ny= 2.2576, nz= 2.3018
at 1.064 µm nx= 2.4212, ny= 2.2907, nz= 2.3325
Non-linear coefficient, pm/V d31 = 8.35, d32 = 8.3
Optical damage threshold, GW/cm2 0.5 (1064 nm, 10 ns)
Chemical properties non-hygroscopic

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