Occasionally, the mismatch could be small. As an example, each time a β-BBO crystal is used to frequency double 1550 nm light-weight and provide 775 nm light-weight, the group velocity mismatch is just a few femtoseconds for every millimeter.
The selection with the most fitted crystal content to get a offered application is commonly significantly from trivial; it really should include the consideration of numerous areas. Such as, a superior nonlinearity for frequency conversion of ultrashort pulses won't assist In case the interaction length is strongly constrained by a sizable group velocity mismatch and the reduced hurt threshold limitations the applicable optical intensities.
Sad to say, it might be very difficult to compare the LIDT specification of the optic to your laser. There are actually multiple regimes by which a pulsed laser can hurt an optic which is predicated over the laser's pulse size. The highlighted columns inside the desk down below outline the appropriate pulse lengths for our specified LIDT values.
Take note that regardless of whether the nominal intensity is underneath the nominal hurt threshold, there might be troubles as a consequence of fluctuations within the beam energy or area depth (e.g., if a beam profile has “sizzling places�?, or resulting from isolated defects in a very crystal, that happen to be more delicate compared to frequent crystal product.
This has not just expanded the abilities of present systems but has also paved the best way for new improvements.
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A 2nd problem is that the team velocity mismatch amongst the 2nd harmonic and essential-frequency pulses will lead to one pulse lagging the opposite as The 2 propagate. This is referred to as temporal walk-off and will come about even below optimal phase-matched disorders.
The team velocities of the elemental and second harmonic pulses are distinctive, regardless if period-matched, along with the magnitude on the group velocity mismatch is dependent upon the crystal Attributes and the optical frequencies in the pulses.
GWU-Lasertechnik offers all conventional nonlinear crystals like LBO, BBO and KTP which has a broad variety of requirements. Beside the very well-set up products, impressive crystals like CLBO or BiBO with outstanding Houses for e. g. deep-UV era or high-electric power ultrashort pulse lasers can be obtained. Despite if individual parts for R & D needs are required or Price-productive figures in compact, medium or big batches with in-time delivery with the production line are needed: GWU’s devoted services helps to discover the best Main components in your software.
Newlight's BBO crystals are already extensively used in next, 3rd, fourth or fifth harmonic generations for high power obvious/UV resources, and optical parametric conversions for prime energy broadly tunable sources.
Numerous Attributes of a nonlinear crystal may be crucial for an application e.g. in nonlinear frequency conversion:
Lastly, spectroscopy, the study of interactions between subject and electromagnetic radiation, enormously Positive aspects through the 266nm era. In spectroscopic apps, various wavelengths of light interact otherwise with elements, offering a spectrum which can be analyzed to find out the material’s Attributes or composition.
This decreases the efficient communication sizing in addition to lowers the conversion performance. One example is, BBO crystals have an angular walk-off of concerning 38 mrad for SHG at 1064 nm wavelength, which has to perform with 6 instances more substantial than KDP crystals.