Nhanganyaya
Mid-infrared (MIR) mwenje muhuwandu hwe2-20 µm inobatsira pakuzivikanwa kwekemikari uye zvipenyu nekuda kwekuvapo kwemitsara yakawanda yekunyudza mamolekyulu munharaunda ino inotaridzika.Yakabatana, shoma-kutenderera sosi ine kuvharika panguva imwe chete yeyakafara MIR siyana inogona kuenderera mberi nekugonesa zvikumbiro zvitsva senge mirco-spectroscopy, femtosecond pombi-probe spectroscopy, uye yakakwirira-simba-renji inonzwisisika kuyerwa Kusvika parizvino zvirongwa zvakawanda zvave.
Yakagadzirwa kuti igadzire yakabatana MIR mwaranzi, senge synchrotron danda mitsara, quantum cascade lasers, supercontinuum masosi, optical parametric oscillators (OPO) uye optical parametric amplifiers (OPA).Zvirongwa izvi zvese zvine masimba avo uye kushaya simba maererano nekuoma, bandwidth, simba, kugona, uye pulse durations.Pakati pazvo, intra-pulse musiyano frequency generation (IDFG) iri kukwezva kutarisisa kuri kukura nekuda kwekuvandudzwa kweyepamusoro-simba femtosecond 2 µm lasers anogona kunyatsopomba madiki-bandgap asiri-oxide asina mutsetse makristasi kuti agadzire yakakwirira-simba Broadband inobatana MIR mwenje.Kuenzaniswa neanowanzo shandiswa OPOs uye OPAs, IDFG inobvumira kudzikiswa mukuoma kwehurongwa uye kukwidziridzwa kwekuvimbika, sezvo kudikanwa kwekuenzanisa matanda maviri akapatsanurwa kana cavities pakurongeka kwepamusoro kunobviswa.Kunze kwezvo, iyo MIR inobuda ndeye intrinsically carrier-envelope-phase (CEP) yakagadzikana neIDFG.
Fig 1
Transmission spectrum ye1-mm-gobvu isina kuvharwaBGSe crystalyakapihwa neDIEN TECH.Iyo inset inoratidza iyo chaiyo kristaro inoshandiswa mukuyedza uku.
Fig 2
Kuyedza kuseta kwechizvarwa cheMIR chine aBGSe crystal.OAP, off-axis parabolic mirror ine hurefu hwekutarisa hunoita 20 mm;HWP, hafu-wave ndiro;TFP, yakaonda-firimu polarizer;LPF, refu-pass sefa.
Muna 2010, itsva biaxial chalcogenide nonlinear crystal, BaGa4Se7 (BGSe), yakagadzirwa uchishandisa nzira yeBridgman-Stockbarger.Iine hupamhi hwakajeka hunobva ku0.47 kusvika ku18 µm (sezvinoratidzwa mumufananidzo 1) ine nonlinear coefficients ye d11 = 24.3 pm / V uye d13 = 20.4 pm / V.Hwindo rekuona pachena reBGSe rakapamhama zvakanyanya kupfuura ZGP neLGS kunyangwe hazvo kusarongeka kwaro kwakadzikira pane ZGP (75 ± 8 pm/V).Kusiyana neGaSe, BGSe inogona zvakare kutemwa pane inodiwa chikamu-inofananidza kona uye inogona kuve anti-reflection yakavharwa.
Kugadziriswa kwekuedza kunoratidzirwa mumufananidzo 2 (a).Mapurusi ekutyaira anotanga kugadzirwa kubva kune yakavakirwa imba Kerr-lens mode-yakakiyiwa Cr:ZnS oscillator ine polycrystalline Cr:ZnS crystal (5 × 2 × 9 mm3, transmission=15% pa1908nm) seyepakati yekuwana inopombwa ne Tm-doped fiber laser pa1908nm.Iyo oscillation mu-stand-wave cavity inopa 45-fs pulses inoshanda pakudzokorora mwero we69 MHz ine avhareji simba re1 W pane inotakura wavelength ye2.4 µm.Simba rinowedzerwa kusvika ku3.3 W mune imwe imba-yakavakwa maviri-nhanho single-pass polycrystalline Cr: ZnS amplifier (5 × 2 × 6 mm3, transmission = 20% pa 1908nm uye 5 × 2 × 9 mm3, transmission = 15% pa. 1908nm), uye nguva yekubuda kwepulse inoyerwa neyakavakwa-yechipiri-harmonic-chizvarwa chizvarwa frequency-yakagadziriswa optical grating (SHG-FROG) apparatus.
