Okwu mmalite
Mid-infrared (MIR) ọkụ na nso nke 2-20 µm bara uru maka njirimara kemịkalụ na nke ndu n'ihi ọnụnọ nke ọtụtụ ahịrị absorption njirimara molekụla na mpaghara a.Otu ihe jikọrọ ọnụ, obere okirikiri nke nwere mkpuchi n'otu oge nke nnukwu MIR nwere ike ime ka ngwa ọhụrụ dị ka mirco-spectroscopy, femtosecond pump-probe spectroscopy, na nha dị elu nke nwere mmetụta dị egwu ruo ugbu a, ọtụtụ atụmatụ nwere.
emepụtara iji mepụta radieshon MIR dị n'otu, dị ka ahịrị beam synchrotron, lasers quantum cascade, supercontinuum isi mmalite, oscillator optical parametric (OPO) na ngwa parametric amplifiers (OPA).Atụmatụ ndị a niile nwere ike na adịghị ike nke ha n'ihe gbasara mgbagwoju anya, bandwit, ike, arụmọrụ, na oge pulse.N'ime ha, intra-pulse differentfrequency generation (IDFG) na-adọta nlebara anya na-eto eto n'ihi mmepe nke ike femtosecond 2 µm lasers nke nwere ike ịmịpụta obere bandgap na-abụghị oxide na-abụghị kristal na-emepụta ike dị elu nke na-ejikọta ọkụ MIR.E jiri ya tụnyere OPO na OPA ndị a na-ejikarị eme ihe, IDFG na-enye ohere ibelata usoro mgbagwoju anya na nkwalite nke ntụkwasị obi, ebe ọ dị mkpa iji dozie ogwe abụọ ma ọ bụ oghere dị iche iche na nkenke dị elu na-ewepụ.E wezụga nke ahụ, mmepụta MIR bụ ihe na-ebu ibu-envelopu-phase (CEP) kwụsiri ike na IDFG.
Ihe osise 1
Ụdị nnyefe nke 1-mm-oke enweghị mkpuchiBGS kristalnke DEN TECH nyere.Ntinye ahụ na-egosi kristal n'ezie ejiri mee nnwale a.
Ihe osise 2
Nhazi nnwale nke ọgbọ MIR nwere aBGS kristal.OAP, enyo parabolic na-apụ apụ na ogologo nlebara anya dị irè nke 20 mm;HWP, efere ọkara-efegharị;TFP, obere ihe nkiri polarizer;LPF, nzacha ogologo ngafe.
N'afọ 2010, a na-emepụta kristal chalcogenide ọhụrụ biaxial chalcogenide, BaGa4Se7 (BGSe), site na iji usoro Bridgman-Stockbarger.Ọ nwere oke nghọta dị ukwuu site na 0.47 ruo 18 µm (dị ka egosiri na Fig. 1) yana ọnụọgụ ọnụọgụ nke d11 = 24.3 pm/V na d13 = 20.4 pm/V.Window nghọta nke BGSe ka sara mbara karịa ZGP na LGS n'agbanyeghị na ọ naghị adị n'ịntanetị dị ala karịa ZGP (75 ± 8 pm/V).N'adịghị ka GaSe, BGse nwekwara ike ịkpụ n'akụkụ akụkụ a chọrọ ma nwee ike kpuchie ihe mgbochi.
E gosipụtara nhazi nnwale ahụ na Fig. 2 (a).A na-ebute ụzọ ụgbọ ala ahụ site na ọnọdụ Kerr-lens nke akpọchiri akpọchi Cr: ZnS oscillator nwere polycrystalline Cr: ZnS crystal (5 × 2 × 9 mm3, nnyefe = 15% na 1908nm) dị ka uru na-enweta site na Tm-doped fiber laser na 1908nm.Oscillation n'ime oghere na-ebili elu na-ebuga 45-fs pulses na-arụ ọrụ na nkwughachi nke 69 MHz na nkezi ike nke 1 W na ogologo ikuku nke 2.4 µm.A na-eme ka ike ahụ dịkwuo elu na 3.3 W n'ime ụlọ e wuru ụlọ abụọ nke otu-agafe polycrystalline Cr: ZnS amplifier (5 × 2 × 6 mm3, nnyefe = 20% na 1908nm na 5 × 2 × 9 mm3, nnyefe = 15% na 1908nm), na a na-atụ oge mmepụta ihe na-emepụta site na ngwa ụlọ arụrụ n'ụlọ nke abụọ-harmonic-oge-resolved optical grating (SHG-FROG).
