The two wide-bandwidth pulses and temporal wander-off bring about a discount in the conversion performance, in addition to worsen the optical excellent of the second harmonic pulses. The suitable crystal thickness really should be picked to minimize both of those consequences.
In several circumstances, a nonlinear crystal used for nonlinear frequency conversion has an exceedingly long lifetime, and that is for a longer time than that of The complete laser system. The crystal material is essentially not modified through operation. Nonetheless, a reduced crystal lifetime can happen below a variety of situation:
However, it might be quite challenging to check the LIDT specification of the optic on your laser. There are actually a number of regimes in which a pulsed laser can hurt an optic and this is predicated about the laser's pulse length. The highlighted columns from the desk beneath define the related pulse lengths for our specified LIDT values.
In an effort to use the desired CW damage threshold of an optic, it is necessary to be aware of the next:
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Normal cleansing and appropriate storage can help increase the lifespan of BBO crystals. It’s also important to prevent exposing the crystals to problems outside the house their specified running vary, as this might cause long term hurt.
The section velocity is the rate at which the sector copyright, i.e. the sine wave, travels in a material. The speed at which a pulse envelope travels in a fabric is called the team velocity and defines the pace in the Vitality packet comprising the optical pulse touring through the fabric.
the chemical durability; e.g., some crystal elements are hygroscopic, Other individuals bear chemical modifications when heated in a very vacuum chamber for software of a dielectric coating
We also layer our goods with anti-reflection levels to minimize representation losses on the crystal surfaces.
Any scratches can degrade the optical effectiveness on the crystal and potentially bring about injury beneath high laser power. For stubborn stains, an answer of moderate detergent or isopropyl Alcoholic beverages might be gently placed on the crystal area after which rinsed off with distilled water.
The Uncooked resources, commonly a mix of barium carbonate and boric acid, are put within a platinum crucible and heated until finally they soften. The temperature is then gradually diminished, allowing for the BBO crystal to kind about many months. The crystal is then extracted, Slice into the desired condition, and polished to obtain a superior-good quality optical surface area.
The placement of the environmentally friendly curve is dependent upon θ. In this case, click here the angle θ is tuned to deliver a refractive index for 515 nm gentle that matches the refractive index for 1030 nm mild. This tuning angle is hence optimized for Sort-I SHG period matching in addition to a fundamental-frequency input beam of 1030 nm.
The wavelength of The sunshine utilised as well as the angle at which it enters the crystal could also effect the crystal’s performance. Suitable alignment and handling with the crystal are essential to acquiring ideal performance.
This decreases the efficient interaction dimensions and likewise lowers the conversion success. As an example, BBO crystals have an angular stroll-off of concerning 38 mrad for SHG at 1064 nm wavelength, which has to carry out with 6 times bigger than KDP crystals.