Isingeniso
Ukukhanya kwe-Mid-infrared (MIR) ebangeni lika-2-20 µm kuyasiza ekuhlonzweni kwamakhemikhali nokokuphila ngenxa yokuba khona kwemigqa eminingi yokumuncwa kwesici samangqamuzana kule ndawo ye-spectral .Umthombo ohlangene, wemijikelezo embalwa onokumbozwa ngasikhathi sinye kobubanzi obubanzi be-MIR ungaqhubeka unike amandla izinhlelo zokusebenza ezintsha njenge-mirco-spectroscopy, i-femtosecond pump-probe spectroscopy , kanye nezilinganiso ezizwelayo zobubanzi obunamandla amakhulu Kuze kube manje izikimu eziningi zine
ithuthukiswe ukuze ikhiqize imisebe ehambisanayo ye-MIR, efana nemigqa ye-synchrotron beam, ama-quantum cascade lasers, imithombo ye-supercontinuum, ama-optical parametric oscillator (OPO) nama-optical parametric amplifiers (OPA).Lezi zinhlelo zonke zinamandla kanye nobuthakathaka bazo mayelana nobunzima, umkhawulokudonsa, amandla, ukusebenza kahle, kanye nobude be-pulse.Phakathi kwazo, i-intra-pulse difference frequency generation (IDFG) idonsa ukunakwa okukhulayo ngenxa yokuthuthukiswa kwamalaser e-femtosecond 2 µm anamandla amakhulu akwazi ukumpompa amakristalu angenawo umugqa we-bandgap amancane ukuze akhiqize ukukhanya okuhambisana ne-MIR okunamandla aphezulu.Uma kuqhathaniswa nama-OPO nama-OPA asetshenziswa ngokuvamile, i-IDFG ivumela ukuncishiswa kwenkimbinkimbi yesistimu nokuthuthukiswa kokwethembeka, njengoba kususwa isidingo sokuqondanisa imishayo emibili ehlukene noma izimbotshana ngokunemba okuphezulu.Ngaphandle kwalokho, okukhiphayo kwe-MIR kuyisigaba se-carrier-envelope-phase (CEP) esizinzile nge-IDFG.
Umdwebo 1
I-spectrum yokudlulisa ye-1-mm-thick engagqotshiweIkristalu ye-BGSeinikezwe yi-DIEN TECH.Isingeniso sibonisa ikristalu langempela elisetshenziswe kulokhu kuhlolwa.
Umdwebo 2
Ukusethwa kokuhlola kwesizukulwane se-MIR ngeIkristalu ye-BGSe.I-OAP, isibuko se-parabolic esingaphandle kwe-axis esinobude bokugxila obusebenzayo obungu-20 mm;I-HWP, ipuleti le-half-wave;I-TFP, i-polarizer yefilimu encane;I-LPF, isihlungi se-long-pass.
Ngo-2010, i-biaxial chalcogenide nonlinear crystal entsha, i-BaGa4Se7 (BGSe), yenziwe kusetshenziswa indlela ye-Bridgman-Stockbarger.Inebanga elibanzi lokubonisa ngale ukusuka ku-0.47 kuya ku-18 µm (njengoba kuboniswe ku-Fig. 1) nama-coefficients angaqondile okuthi d11 = 24.3 pm/V kanye no-d13 = 20.4 pm/V.Iwindi lokubonisa ngale le-BGSe libanzi kakhulu kune-ZGP kanye ne-LGS nakuba ukungahambelani kwalo kuphansi kune-ZGP (75 ± 8 pm/V).Ngokungafani ne-GaSe, i-BGSe ingaphinde isikwe nge-engeli efaniswayo yesigaba futhi ingaba yi-anti-reflection coated.
Ukusetha kokuhlola kuboniswe ku-Fig. 2(a).Ama-pulses okushayela aqala akhiqizwa kwimodi ye-Kerr-lens ekhiywe ekhaya i-Cr:ZnS oscillator ene-polycrystalline Cr:ZnS crystal (5 × 2 × 9 mm3 , transmission=15% ku-1908nm) njengendlela yokuzuza empontshwa I-Tm-doped fiber laser ku-1908nm.I-oscillation endaweni yokuma yamagagasi iletha ama-pulses angu-45-fs asebenza ngenani lokuphindaphinda elingu-69 MHz ngamandla amaphakathi angu-1 W kubude begagasi benkampani yenethiwekhi engu-2.4 µm.Amandla akhuliswa abe ngu-3.3 W endaweni eyakhiwe ekhaya enezigaba ezimbili ze-single-pass polycrystalline Cr:ZnS amplifier (5 × 2 × 6 mm3 , transmission=20% at 1908nm and 5 × 2 × 9 mm3 , transmission=15% at 1908nm), kanye nobude be-pulse okukhiphayo kukalwa ngesisetshenziswa sesibili se-harmonic-generation-resolved Optical grating (SHG-FROG) esakhelwe ekhaya.
