a-BBO Crystal - An Overview
a-BBO Crystal - An Overview
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The calculation earlier mentioned assumes a uniform beam depth profile. You must now take into account hotspots during the beam or other non-uniform depth profiles and roughly work out a most electrical power density.
A2: Indeed, extended publicity to humidity can degrade the optical overall performance of BBO crystals. Humidity can cause water absorption around the crystal area, which may influence its optical Qualities.
The Rayleigh selection quantifies the distance, calculated from the beam midsection, above which the beam diameter is approximately continuous. The shorter the Rayleigh range, the greater the speed of divergence.
This efficiency is vital, particularly when just one considers the generation from the 266nm wavelength, wherever even minor inefficiencies can cause significant Power losses.
A number of aspects can affect the overall performance of BBO crystals. These involve temperature, humidity, and the quality of the incident light-weight. Correct managing and storage may help sustain the crystal’s general performance. Temperature can influence the section-matching circumstances of BBO crystals, which subsequently has an effect on their efficiency in frequency conversion apps.
As the second harmonic light propagates, its energy flows in a special path than that of the fundamental light.
Though the above process provides a superb rule of thumb for LIDT values, make sure you Get in touch with Tech Aid Should your wavelength is different from the required LIDT wavelength. Should your energy density is under the adjusted LIDT from the optic, then the optic really should perform for your personal application.
When an optic is destroyed by a continual wave (CW) laser, it is normally mainly because of the melting from the surface on account of absorbing the laser's Power or harm to the optical coating (antireflection) [one]. Pulsed lasers with pulse lengths for a longer time than one µs may be addressed as CW lasers for LIDT discussions.
Comprehension Crystal is akin to appreciating the bedrock of advanced optical know-how. At its essence, BBO, or Beta Barium Borate, stands as a nonlinear optical crystal. The expression “nonlinear�?in this article signifies the special skill in the crystal to communicate with light within a method that alters The sunshine’s frequency.
A5: Yes, BBO crystals have exceptional thermal balance and can preserve their Attributes at place temperature. Therefore they can be used in a wide range of environments without demanding special temperature control.
The team velocity as well as the section velocity are certainly not equal, this means the sine wave in the provider along with the envelope of the heart beat transfer more info as a result of optical media at unique speeds.
When comparing an LIDT specified for your pulsed laser in your laser, it is vital to be aware of the subsequent:
When an enter pulse's spectral range is equal to or narrower compared to the reference pulse, the produced 2nd harmonic pulse incorporates a length that is certainly shorter by an element of 1/√2 as well as a spectral width which is broader by an element of √2.
This is particularly vital in biological and medical analysis where unique compounds or cells are tagged with fluorescent markers. The 266nm light can excite these markers, producing them stick out Plainly towards a qualifications, thus facilitating detailed Examination.