The BBO Crystal Diaries
The BBO Crystal Diaries
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As soon as the crystals have fashioned, They are really then carefully extracted within the cooled combination. This extraction system necessitates a substantial amount of care to stay away from detrimental the newly formed crystals.
Optical parametric chirped-pulse amplification (OPCPA): We use OPCPA to find out our things�?nonlinear conversion performance and also stage-matching angle to get a offered enter wavelength and signal/idler wavelengths.
Unfortunately, it can be very hard to compare the LIDT specification of the optic towards your laser. You'll find a number of regimes where a pulsed laser can harm an optic and this relies on the laser's pulse size. The highlighted columns from the desk beneath outline the relevant pulse lengths for our specified LIDT values.
) is The main element for BBO to acquire higher conversion performance. Limited aim of laser beam isn't recommended.
, the angle concerning The sunshine's propagation route and also the crystal's optic axis is often tuned so which the refractive index of a certain frequency (ω) in the fundamental enter pulse exactly equals the refractive index of twice the enter frequency (twoω). It really is normal to improve stage matching situations for the frequency at close to the middle of the heartbeat's bandwidth.
Period matching considerably improves the conversion effectiveness and may be required to receive enough frequency-doubled gentle for purposes, but second harmonic generation (SHG) will happen regardless of whether period matching is not executed. The influence of section matching around the output depth of SHG light-weight (I2ω) is illustrated in Figure sixteen.
Figure eighteen: The everyday and extraordinary refractive indices of β-BBO differ with frequency and wavelength as a consequence of a fabric home named dispersion. Dispersion exists in all media apart from vacuum.
This difference triggers stage mismatch amongst numerous gentle polarization pieces when propagating via a BBO crystal. Changing the angle involving the beam and crystal axes can compensate for this stage mismatch.
These processes entail Mixing two or maybe more input beams of light with a variety of frequencies to produce a consequence beam that has a new frequency.
Although this general guideline gives a typical development, It's not necessarily a quantitative Investigation of LIDT vs wavelength. In CW purposes, For illustration, damage scales far more strongly with absorption in the coating and substrate, which won't essentially scale effectively with wavelength.
Dust and stains on crystal surfaces may cause scattering/reduction of sunshine and may even respond with mild to break optical surfaces in a large incident laser electric power.
Also, it could be hugely fascinating to make use of a crystal content that may be critically period-matched at place temperature for the reason that noncritical period matching often involves the operation in the crystal within a temperature-stabilized crystal oven. Having said that, the feasibility of significant section matching may very well be supplied just for adequately significant peak powers.
The wavelength of the light applied and also the angle at which it enters the crystal could also impact the crystal’s functionality. Good alignment and dealing with of the crystal are vital to accomplishing optimal efficiency.
The 266nm wavelength presents distinct interactions that other wavelengths can’t, which makes it indispensable for detecting and finding check here out selected compounds.