About PPLN Crystal
About PPLN Crystal
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MgO:PPLN SHG crystals is often fabricated with QPM grating intervals appropriate for a variety of commercially out there pump laser wavelengths from 976 nm to 2100 nm, letting era of frequency doubled gentle amongst 488nm and 1050nm.
eighty four, wherever L will be the crystal size and b may be the confocal parameter and particularly twice of Raleigh selection. Look at "Concentrating problem and wavelength conversion efficiency" and "SHG normalized performance and pump wavelength dependence" to check out more details on the concentrating/nornalized conversion efficiency vs. wavelengths.
Moreover, BPM suffers from wander-off troubles on account of birefringence, which gives limitation to the beam excellent and highest interacting size for efficiency optimization.
[2]. This requires the appliance of a robust electric powered field to the ferroelectric crystal by using patterned electrodes on the crystal surface area, which typically Possess a period in between a couple of microns and several tens of microns, and usually are made by using a photolithographic process.
five mm to reduce team velocity mismatch and are ideal for frequency doubling or tripling of Ti:sapphire and Yb:doped laser pulses. The vital and noncritical section matching LBO crystals are perfect for next or third harmonic generation of Nd:YAG and Yb:doped lasers.
A common strategy for acquiring ultrathin crystals is always to to start with optically Make contact with a thicker nonlinear crystal with some substrate (e.g. of fused silica) and after that to shine the crystal right down to the necessary thickness of e.
These focussing conditions use to pulsed lasers far too, but a result of the significant peak powers, the spot dimensions requirements are less sensitive. (Pay attention to the crystal harm threshold so as not to emphasis as well tightly.)
The poling sample is lithographically defined and hugely customizable allowing crystals to be used in an array of purposes that involve wavelength conversion.
Optical crystals can show unique varieties of optical nonlinearities, that may be used get more info in different techniques:
Figure 5: On account of this group velocity mismatch (GVM), two pulses which are in the beginning overlapping in time can be now not overlap following some propagation length. So, when nonlinear crystal with length exceeds the team velocity walk-off length, a distorted pulse output will probably be generated.
flux-developed KTP and RTP with its large nonlinearity, also in variants with high gray tracking resistance
the chemical durability; e.g., some crystal elements are hygroscopic, Other individuals go through chemical adjustments when heated inside a vacuum chamber for software of the dielectric coating
GWU-Lasertechnik delivers all conventional nonlinear crystals like LBO, BBO and KTP with a wide variety of specifications. Beside the well-set up products, modern crystals like CLBO or BiBO with fantastic properties for e. g. deep-UV era or superior-electric power ultrashort pulse lasers can be found. Irrespective of if unique parts for R & D reasons are required or cost-productive quantities in little, medium or massive batches with in-time shipping and delivery for the output line are needed: GWU’s devoted company really helps to discover the greatest core elements for your personal application.
Crystals that happen to be non-critically stage-matched inside a crystal oven might show problems in the event the crystal temperature is transformed also fast or way too typically. In particular, anti-reflection coatings may be damaged due to different thermal enlargement coefficients of the concerned products.