PPLN Crystal Options
PPLN Crystal Options
Blog Article
Figure eight summarizes the prerequisite for efficient nonlinear wave mixing process and likewise presents the comparison involving BPM vs. QPM:
However, these a technique are unable to enable successful use of material's whole transparency wavelength ranges at optimized conversion efficiency. Moreover, BPM nonlinear wave mixing process occurs while in the presence of both ordinary and remarkable polarized radiations. When propagating together non-optical axis way of a nonlinear optical crystal, the incredible wave suffers from birefringence stroll-off; Whilst regular ray will likely not.
Undoped PPLN will likely be operated at temperatures involving one hundred°C and two hundred°C, to attenuate the photorefractive influence that will injury the crystal and lead to the output beam to be distorted.
PPLN crystals might be coupled with waveguide structures to reinforce the conversion process, yielding higher effectiveness particularly in weak light-weight programs.
They show good homogeneity over significant volumes and also have a large hurt threshold, but are hygroscopic and possess a very low nonlinearity.
The selection on the best suited crystal product for any provided application is frequently considerably from trivial; it should include the consideration of numerous features. For example, a superior nonlinearity for frequency conversion of ultrashort pulses would not enable If your interaction length is strongly limited by a considerable group velocity mismatch and also the reduced destruction threshold boundaries the relevant optical intensities.
The shopper can check "Pump laser spectral width and wavelength conversion performance" To find out more about that.
To empower economical nonlinear wavelength conversion, more info each photon Power conservation and photon momentum conservation are being satisfied simultaneously inside the nonlinear optical system, as proven in determine two. The necessity to the photon momentum conservation is also known as “section-matching�?constraint. If this kind of phase matching affliction is just not pleased, the generated photons will destructively interfere with each other, restricting the quantity of created photons that finally exit the crystal.
Operation of nonlinear crystals at temperatures down below home temperature (to obtain phase matching) is normally problematic, as it might cause condensation of drinking water to the crystal surfaces When the bordering air will not be very dry.
Typically, the crystal material ought to have a higher optical transparency for all wavelengths associated �?as an example, for pump, sign and idler in an optical parametric amplifier.
flux-developed KTP and RTP with its superior nonlinearity, also in variants with substantial grey tracking resistance
These crystals are suitable with a variety of pump sources, such as femtosecond, picosecond, nanosecond, and steady waves. We sustain a available stock of MgO:PPLN crystals to make certain brief shipping and meet up with your application requires successfully.
The injury threshold of MgO:PPLN or PPLN depends upon wavelength in addition to whether the source is CW or pulsed. During the CW regime, the edge depends on the depth which is lessen when obvious wavelengths are included.
Several other special periodic sample layouts, such as cascaded, lover-out, as well as other custom made configurations are available for specific purposes utilizing the CW, ns pulsed and extremely-shorter ps/fs pulsed laser pumps. Samples of Exclusive QPM structures are illustrated in figure three