PPLN

PPLN
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PPLN (Periodically Polarized Lithium Niobate) is an efficient wavelength conversion nonlinear crystal. Because periodic polarization does not change the crystal’s optical properties, PPLN has the characteristics of LiNbO3 and a wide transmission range (0.4-4.5 μm). It meets the maximum nonlinear coefficient d33=17.3 pm/V under quasi-phase-matching. It has these characteristics:

  • High gain and low loss
  • Covers the near and Infrared region
  • Long service life

It can be used for frequency doubling, differential frequency, and frequency and optical parametric oscillation and amplification.

So, it is widely used in optical parametric variation oscillators. The OPO process using PPLN can obtain light of 3~4.5 μm wavelength, which can realize the wavelength band that is difficult to achieve efficient output by conventional phase matching and has a wide application prospect.

Features of PPLN:

  • Long service life
  • Wide light transmission range
  • High nonlinear coefficient
  • High damage resistance threshold
  • Can be visible to the middle and far infrared band
  • Can be used for uniform/multi-period/sector QPM structure
  • Can be used for up conversion (SHG/SFG) and down conversion (DFG/OPA/OPG/OPO) mixing configuration

Standard Requirement

Standard Request
Length5 ~ 60mmCross Section4X1 ~ 20X20mm2
Wavefront Distortion
λ/4 @ 633nmSurface Finish
10-5, after coating20-10
Parallelism
< 20 arc sec.Flatness
λ/8 @ 633nm
Perpendicularity
< 5 arc sec.Extinction Ratio
300:1 – 500:1
Damage Threshold
100MW/cm2 10ns 1064nm 10Hz （PPLN switch）
200MW/cm2 10ns 1064nm 10Hz （MgO：PPLN switch）
Refractive Index
ne2=a1+b1f+ (a2+b2f)/{λ2- (a3+b3f)2} +(a4 +b4f)/(λ2 -a52) -a6λ2
f=(T-24.5)(T+570.82)

Sellmeier equation coefficients of PPLN crystals doped with 5% MgO

CoefficientValue
a15.756
a20.0983
a30.202
a4189.32
a512.52
a61.32×10-2
b12.860×10-6
b24.7×10-8
b36.113×10-8
b41.516×10-4

Spectra

PPLN Output-mirror-transmittance-CRYLINKPPLN output-mirror-transmittance-CRYLINK
Transmittance curves of PPLN-OPO resonator output mirror M1(a), input mirror M2(b)
Nonlinear crystal PPLN period 1 signal wavelength-CRYLINKNonlinear crystal PPLN period 2 signal wavelength-CRYLINK
Temperature tuning curves of PPLN-OPO pumped by 1064nm Nd:YVO4 laser

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