a-BBO Crystal - An Overview
a-BBO Crystal - An Overview
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These crystals are unique as a consequence of their capacity to alter the frequency of light passing by means of them, a home that is extremely desired in several fields such as laser engineering and quantum physics. The flexibility of BBO crystals tends to make them a vital element in many Superior optical units.
The group velocities of the elemental and next harmonic pulses may also be distinctive, even when stage-matched, plus the magnitude in the team velocity mismatch depends upon the crystal Attributes along with the optical frequencies in the pulses.
A second problem is that the group velocity mismatch concerning the 2nd harmonic and fundamental-frequency pulses will end in 1 pulse lagging another as the two propagate. This is referred to as temporal walk-off and will take place even under optimal section-matched conditions.
In quasi-period matching, the crystal content is “poled�?to have up and down domains to counteract the section-mismatch of the material, in which the poling period is distinct into the wavelengths of conversation.
The energy density of your beam needs to be calculated regarding J/cm2. The graph to the appropriate shows why expressing the LIDT as an Power density presents the top metric for short pulse sources. During this regime, the LIDT offered being an Power density might be placed on any beam diameter; 1 doesn't have to compute an modified LIDT to adjust for adjustments in spot sizing.
Damaging uniaxial α-BBO crystal is an excellent birefringent crystal, ideal for the manufacture of polarizer, polarization beam displacer, time delay compensator plate as well as other birefringent gadget, especially for UV and substantial electric power laser.
Whilst the check benefits are only representative of one coating operate, Thorlabs specifies hurt threshold values that account for coating variances.
When an optic is destroyed by a continuous wave (CW) laser, it is often mainly because of the melting of your floor as a result of absorbing the laser's Vitality or harm to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths for a longer time than one µs can be handled as CW lasers for LIDT conversations.
When pulse lengths are in between 1 ns and one µs, laser-induced injury can come about possibly due to absorption or even a dielectric breakdown (for that reason, a consumer ought to Verify the two CW and pulsed LIDT). Absorption is both resulting from an intrinsic residence with the optic or resulting from floor irregularities; Consequently LIDT values are only legitimate for optics Conference or exceeding the floor excellent technical click here specs given by a manufacturer.
Frequent cleansing and appropriate storage can help extend the lifespan of BBO crystals, ensuring their continued contribution to the field of optics and photonics.
Thorlabs provides a wide selection of optics optimized for use with femtosecond and picosecond laser pulses. Please see beneath To learn more.
Because the dynamics of this process are highly subject matter to experimental parameters, it truly is tricky to arbitrarily forecast the precise consequences on the 2nd harmonic pulse. These consequences can include things like back again conversion, through which 2nd harmonic gentle is converted back again to basic gentle, and spectral narrowing from the SHG pulse.
The 266nm era refers back to the production of ultraviolet mild by using a wavelength of 266 nanometers.
This is especially critical in biological and health-related investigate where by particular compounds or cells are tagged with fluorescent markers. The 266nm light-weight can excite these markers, building them stand out Plainly towards a history, therefore facilitating detailed Examination.