Intshayelelo
Ukukhanya okuphakathi kwe-infrared (MIR) kuluhlu lwe-2-20 µm luluncedo ekuchongeni iikhemikhali kunye nebhayoloji ngenxa yobukho bemigca emininzi yokufunxa yemolekyuli kulo mmandla wokubonwayo.Umthombo ohambelanayo, wemijikelo embalwa kunye nokugubungela ngaxeshanye kuluhlu olubanzi lwe-MIR unokwenza ngakumbi usetyenziso olutsha olunje nge-mirco-spectroscopy, i-femtosecond pump-probe spectroscopy, kunye nemilinganiselo ebuthathaka yoluhlu oluphezulu. Ukuza kuthi ga ngoku uninzi lwezicwangciso
iphuhliswe ukuvelisa imitha ye-MIR ehambelanayo, efana nemigca ye-synchrotron ye-beam, i-quantum cascade lasers, imithombo ye-supercontinuum, i-oscillators ye-parametric oscillators (OPO) kunye ne-optical parametric amplifiers (OPA).Ezi zikimu zonke zinamandla kunye nobuthathaka bazo malunga nobunzima, i-bandwidth, amandla, ukusebenza kakuhle, kunye nobude be-pulse.Phakathi kwazo, i-intra-pulse difference frequency generation (IDFG) itsala umdla okhulayo wokubulela kuphuhliso lwamandla aphezulu e-femtosecond 2 µm lasers ezinokumpompa ngokufanelekileyo iikristale ezincinci ze-bandgap non-oxide nonlinear ukuvelisa amandla aphezulu ombane ohambelana nokukhanya kwe-MIR.Xa kuthelekiswa nee-OPO ezisetyenziswa ngokuqhelekileyo kunye nee-OPA, i-IDFG ivumela ukunciphisa ubunzima benkqubo kunye nokuphucula ukuthembeka, njengoko imfuno yokulungelelanisa iiplanga ezimbini ezihlukeneyo okanye i-cavities kwi-precision ephezulu isusiwe.Ngaphandle koko, imveliso ye-MIR i-intrinsically carrier-envelope-phase (CEP) izinzile kunye ne-IDFG.
Isazobe soku-1
I-spectrum yokuhanjiswa kwe-1-mm-thick-thick engafakwangaIkristale ye-BGSeinikwe yi-DIEN TECH.I-inset ibonisa ikristale yokwenyani esetyenziswe kolu vavanyo.
Isazobe 2
Ukusekwa kovavanyo lwesizukulwana se-MIR ngeIkristale ye-BGSe.I-OAP, i-off-axis parabolic mirror kunye nobude bojoliso obusebenzayo obuyi-20 mm;I-HWP, i-half-wave plate;I-TFP, i-polarizer yefilimu encinci;I-LPF, icebo lokucoca ixesha elide.
Kwi-2010, i-crystal entsha ye-biaxial chalcogenide nonlinear, i-BaGa4Se7 (BGSe), yenziwe kusetyenziswa indlela ye-Bridgman-Stockbarger.Inoluhlu olubanzi lokungafihli ukusuka kwi-0.47 ukuya kwi-18 µm (njengoko kubonisiwe kwi-Fig. 1) kunye ne-nonlinear coefficients ye-d11 = 24.3 pm/V kunye ne-d13 = 20.4 pm/V.Ifestile ye-transparency ye-BGSe ibanzi kakhulu kune-ZGP kunye ne-LGS nangona ukungahambelani kwayo kungaphantsi kwe-ZGP (75 ± 8 pm/V).Ngokuchaseneyo ne-GaSe, i-BGSe inokusikwa kwi-angle efunekayo yokulinganisa isigaba kwaye inokuba yinto echasene ne-reflection.
Ukusetwa kovavanyo kubonakaliswe kumfanekiso wesi-2 (a).Iipulses zokuqhuba ziveliswa ekuqaleni kwimowudi ye-Kerr-lens eyakhelwe ekhaya-i-Cr: i-oscillator ye-ZnS ene-polycrystalline Cr: i-ZnS crystal (5 × 2 × 9 mm3, i-transmission = 15% kwi-1908nm) njengendlela yokufumana i-medium pumped by a. I-laser ye-fiber ye-Tm-doped kwi-1908nm.I-oscillation kwindawo yokuma yamaza ihambisa i-45-fs pulses esebenza kwizinga lokuphindaphinda kwe-69 MHz kunye namandla aphakathi kwe-1 W kwi-carrier wavelength ye-2.4 µm.Amandla akhuliswe ukuya kwi-3.3 W kwi-home-built-inqanaba lesibini-i-polycrystalline eyodwa-pass polycrystalline Cr: i-ZnS amplifier (5 × 2 × 6 mm3, ukuhanjiswa = 20% kwi-1908nm kunye ne-5 × 2 × 9 mm3, ukuhanjiswa = 15% I-1908nm), kunye nobude bexesha lokuphuma kwe-pulse kulinganiswa ne-home-built-harmonic-generation-generation frequency-resolved optical grating (SHG-FROG) i-apparatus.
