Getting My KGW Crystal To Work
Getting My KGW Crystal To Work
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When ytterbium-doped laser gain media usually show a small quantum defect, ytterbium-doped tungstates enable for notably smaller values. By way of example, a 1030-nm Yb:YAG laser would Typically be pumped close to 940 nm, Whilst Yb:KGW or Yb:KYW could possibly be most effectively pumped close to 981 nm.
We employed a transmission grating (TG) for a dispersive element in our stretcher and compressor. A compact configuration was adopted, wherever the stretcher and the compressor shared 1 grating much like that in Ref.
The initial two peaks might be linked to luminescence of pure material59, while the remaining peaks might be attributed into the luminescence of unidentified dopants, although the provider specified the sample as undoped. The luminescence of YAG crystal creates solid UV luminescence which has a optimum intensity at 300 nm, which can be attributed to merged self-trapped exciton and antisite defect-linked emissions60. Finally, no luminescence while in the UV, seen and near-IR was observed in KGW and LT crystals, at the least throughout the detection choice of fiber spectrometer (two hundred�?00 nm).
], but it would insert a lot more Expense to this ingredient. The intra-cavity spectral gain curve can be modulated by inserting an etalon that minimizes the actual acquire on the wavelength with the maximum attain issue[
The comparison with glasses is acceptable since the big attain bandwidth enables e.g. tungstate femtosecond lasers and tunable lasers to contend with glass lasers.
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At last, we investigated the extended-expression performances of SC generation in crystal samples under exceptional pumping circumstances at greater laser repetition charges. In doing so, the crystal samples weren't translated and stored within a stationary posture with regard to your pump beam throughout the full measurement. The illustrations illustrating robust extensive-time period performances of SC technology in KGW and YAG crystals at high laser repetition fees may be observed somewhere else. Much more particularly, stable efficiency of KGW crystal at 2 MHz pulse repetition price underneath extremely related pump beam focusing geometry was documented recently30, whereas YAG crystal shown steady efficiency for quite a few several hours at two hundred kHz pulse repetition price Despite incredibly tight focusing from the pump beam (NA=0.085)32. The extended-time period efficiency exams in LSO, LYSO and YSO disclosed gradual narrowing of the SC spectra over the long-wavelength side that happened immediately after a specific publicity time and could be attributed into the optical degradation of those materials. For illustration, in LSO, the onset of spectral narrowing was observed soon after (sim twenty) minutes in a laser repetition price of ten kHz, even though in a laser repetition fee of 20 kHz, stable SC technology general performance was noticed just for approximately 2 min.
Despite the fact that BGO and LT manufactured the narrowest SC spectra (marginally a lot less than 1.five optical octaves), they could be seen as really beautiful nonlinear materials for broadband check here SC era with pumping at for a longer time laser wavelengths. Owing to its big nonlinearity, BGO exhibited the lowest SC era threshold (seventy eight nJ) Amongst the investigated supplies, which can be twenty five % reduced than in KGW and will be considered as excellent nonlinear product for very small-threshold SC generation. The noticed steady and sturdy problems-absolutely free functionality of BGO and GGG at 200 kHz pulse repetition fee implies that these nonlinear elements have a potential for SC era at even better, MHz, repetition costs. In addition, these products deliver SC radiation with a great set of parameters which are essential for programs in higher velocity spectroscopy and imaging that utilize bulk-produced SC, see e.g.seventeen,eighteen,19,20.
We designed a diode-pumped Yb:KGW regenerative amplifier given that the front stop from the kilohertz terawatt laser procedure. Broad bandwidth pulses ended up obtained by making use of twin crystals with distinct orientations of their optical axes[
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-switched laser output beneath the two crystal placement configurations. The black line denotes the configuration Using the crystals put in the same orientation, when the crimson line is underneath the configuration of crystals placed in orthogonal orientation.
Determine eight Intra-cavity pulse amplification system monitored by an oscilloscope. The heartbeat underwent an unsaturated amplification due to the mirror damage limitation.
]. The twin-crystal configuration lowers the thermal load on Each and every crystal while retaining a significant get, and facilitates the payment of every one’s thermal lensing result. Thus, the laser cavity can operate with a big security variety in excess of the thermal lensing effect variation.