Examine This Report on a-BBO Crystal

The calculation above assumes a uniform beam depth profile. It's essential to now consider hotspots during the beam or other non-uniform depth profiles and approximately calculate a most power density.

Beta Barium Borate (BBO) crystals are actually a topic of fascination in the sector of optics and photonics because of their special Homes. In the following paragraphs, we aim to answer ten popular questions on BBO crystals, offering a comprehensive idea of this fascinating materials.

The situation of the inexperienced curve is dependent upon θ. In such cases, the angle θ continues to be tuned to supply a refractive index for 515 nm light that matches the refractive index for 1030 nm light-weight. This tuning angle is therefore optimized for Type-I SHG period matching as well as a essential-frequency input beam of 1030 nm.

In quasi-period matching, the crystal product is “poled�?to get up and down domains to counteract the period-mismatch of the fabric, exactly where the poling period of time is distinct for the wavelengths of interaction.

From a ray-model perspective, the propagation course defines the orientation in the central (Main) ray in Determine 23. The SHG method is afflicted with the range of angles in excess of which incident light propagates, for the reason that gentle that is not parallel towards the Main ray has diminished phase-matching relative into the chief ray.

As the second harmonic mild propagates, its energy flows in a unique course than that of the fundamental gentle.

The spatial stroll-off angle relies on the size on the beam plus the crystal duration. Whilst the angle is often sizeable, it is normally modest, typically within the buy of ten mrad, and can be neglected.

a-BBO crystals using a wedge angle (α) may be customized fabricated with the required orientation in the optical axis. A paired or such prisms with the optical axes orthogonal to one another can be employed read more to continually alter the phase change or time hold off amongst two orthogonally polarized pulses.  

When pulse lengths are involving one ns and one µs, laser-induced harm can manifest possibly as a result of absorption or simply a dielectric breakdown (for that reason, a consumer need to Verify equally CW and pulsed LIDT). Absorption is possibly because of an intrinsic property of your optic or because of surface irregularities; As a result LIDT values are only valid for optics meeting or exceeding the area top quality requirements presented by a company.

Thus, the next harmonic pulse spectrum, proven on the right, provides a spectral width about similar to the ideal scenario. Ideally, every single frequency in the basic pulse spectrum might be simultaneously stage matched.

Thorlabs provides a big choice of optics optimized for use with femtosecond and picosecond laser pulses. Be sure to see beneath For more info.

In the broad environment of nonlinear optical crystals, BBO crystals stick out as pioneers, particularly in the realm of 266nm generation.

The 2nd harmonic mild is then polarized parallel to the airplane. Angle tuning adjusts θ which is done by rotating the crystal across the Y-axis.

Pulsed lasers with superior pulse repetition frequencies (PRF) might behave equally to CW beams. Sad to say, this is highly depending on elements which include absorption and thermal diffusivity, so there is no trustworthy system for deciding whenever a superior PRF laser will injury an optic as a consequence of thermal effects.