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The team velocities of the fundamental and second harmonic pulses will also be diverse, regardless if period-matched, as well as the magnitude of the group velocity mismatch is dependent upon the crystal Qualities along with the optical frequencies from the pulses.
While this general guideline gives a basic craze, It's not necessarily a quantitative analysis of LIDT vs wavelength. In CW apps, For example, destruction scales a lot more strongly with absorption inside the coating and substrate, which won't always scale properly with wavelength.
The section matching angle can be adjusted by rotating the crystal across the y axis. An adjustment that is usually inside of a number of degrees can possibly enhance the functionality with the crystal inside the setup or match A different fundamental frequency while in the crystal's running assortment.
Any contamination can degrade the optical performance from the crystal and likely bring about problems under significant laser electrical power. When storing BBO crystals, they should be put within a protective situation to circumvent Actual physical damage and dust accumulation.
In the situation of Sort-I phase matching and β-BBO crystals, the basic gentle propagates as an extraordinary wave from the crystal, whilst the second harmonic light-weight propagates as a normal wave.
Their large harm threshold and fantastic thermal security make read more them ideal for use in significant-energy laser devices, while their wide transparency range will allow them to work which has a broad number of laser wavelengths.
Such a capability is priceless in cases the place a particular light-weight frequency is needed, although the supply doesn’t In a natural way give it. By making use of BBO’s Homes, researchers and engineers can effectively “tune�?their light sources to wished-for frequencies.
Taken alongside one another, these diverse applications underscore the enormous price BBO crystals bring to several sectors. As a result of its unparalleled 266nm generation, the BBO crystal is not merely a Resource but a catalyst, propelling developments across diverse fields.
A5: Yes, BBO crystals have exceptional thermal steadiness and might manage their Houses at room temperature. Because of this they are often Utilized in a variety of environments with no demanding Specific temperature Regulate.
The team velocity as well as section velocity are not equal, indicating the sine wave of your provider as well as the envelope of the heartbeat transfer as a result of optical media at diverse speeds.
When selecting an SHG crystal, the pulse length on the laser supply has to be taken into consideration. A mismatch among the duration and crystal thickness will result in SHG pulses more time in time and narrower in spectral content than achievable less than ideal situations.
Even so, the nonlinear optical Attributes of a-BBO crystal is vanished because of the centric symmetry with its crystal construction. It is far from encouraged to implement for NLO procedures.
Era of deep ultraviolet radiation at 210 nm by Variety-I 3rd harmonic era is reached within a set of BBO crystals with conversion efficiency as superior as 36%.