BBO Crystal Fundamentals Explained

BBO Crystal Fundamentals Explained

Blog Article

This house is important in several optical devices, as it permits the manipulation and control of gentle in methods that might not be feasible with linear optical supplies.

BBO is the only real NLO materials which may be applied to supply the fifth harmonic era (5HG) of Nd:YAG lasers at 213 nm. On account of a little acceptance angle and enormous angular walkoff, superior laser beam top quality (small divergence, great manner issue, and so on.

Their high problems threshold and outstanding thermal security make them ideal for use in superior-electrical power laser programs, though their large transparency vary allows them to operate using a wide selection of laser wavelengths.

The basic field now driving the sort-I SHG course of action may be the Eoγ component in the incident discipline. At γ = 90°, there would be zero SHG output, For the reason that travel field Eoγ = 0.

Even well below the edge for fast damage, some crystal products exhibit a continuous degradation throughout the made use of volume, e.

Phase matching appreciably enhances the conversion effectiveness and will be needed to get ample frequency-doubled gentle for purposes, but 2nd harmonic generation (SHG) will take place even when period matching just isn't carried out. The influence of period matching to the output depth of SHG gentle (I2ω) is illustrated in Determine 16.

When an optic is broken by a constant wave (CW) laser, it is generally because of the melting on the area as a result of absorbing the laser's Electricity or damage to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths for a longer time than one µs is usually treated as CW lasers for LIDT discussions.

Nonlinear Crystals of both β-barium borate (BBO) or lithium triborate (LBO) are useful for frequency conversion of laser resources. BBO crystals attribute thicknesses from 0.2mm to 0.5mm to minimize group velocity mismatch and are perfect for frequency doubling or tripling of Ti:Sapphire and Yb:doped laser pulses. The critical and noncritical phase matching LBO crystals are perfect for 2nd or third harmonic generation of Nd:YAG and Yb:doped lasers.

In quasi-stage matching, the crystal substance is “poled�?to have up and down domains to counteract the phase-mismatch of the fabric, in which the poling period is unique to the wavelengths of interaction.

It is usually necessary to focus the incident gentle inside the crystal for SHG applications, given that effective generation of 2nd harmonic gentle demands superior peak click here intensities, for instance 109 W/cm2. When using femtosecond pulses with moderate energies within the nanojoule range, obtaining the required peak intensities can have to have modest focal spots.

Pumped by the fourth harmonic of the Nd:YAG laser (at 266nm), a tunable OPO with signal wavelength range between 422nm and 477nm has actually been noticed by angle-tuning a type I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields much more than fiftyµJ (utmost one hundred thirtyµJ),

Furthermore, BBO crystals are noted for their higher nonlinear coefficient, which enables them to efficiently change the frequency of light.

Along with their large injury threshold, BBO crystals also exhibit excellent thermal and chemical steadiness. They're able to face up to a wide range of temperatures and resist degradation from various chemical interactions.

Any imperfections during the reducing procedure could potentially have an impact on the optical Homes from the crystals.