Dhizaini yenzira yemaziso ye66-femtosecondlaser yakakiyiwa nenzira
Iyi laser ine 66-femtosecond mode-locked ilaser yefiber ine ytterbium-doped ine denderedzwa repamusoro ine non-reciprocal phase shifter. Inoita kuti 147 MHz fundamental frequency mode-locking ikwanise kuvharwa. Nekugadzirisa daro riri pakati pemagrating, upamhi hwe spectral hwe 39.8 nm uye upamhi hwe pulse hwe 66 fs mushure mekumanikidzwa kwekunze zvinowanikwa. Pasimba repombi rakakwirira, second-order uye third-order harmonic mode-locking ine frequency yekudzokorora ye 294.1 MHz uye 442.3 MHz inowanikwa.
Tsananguro yenzira yemaziso:
Resonator ine zvikamu zve optical zve spatial kumativi ese uye chikamu che fiber chinochengetedza polarization chiri pakati. Chikamu che spatial chekuruboshwe chinosanganisira girazi rekutarisa rose (M1), plate ye λ/8 wave (EWP), uye Faraday rotator (FR). Musanganiswa weEWP neFR unogona kushandiswa se non-reciprocal phase shifter, zvichipa non-reciprocal phase bias, nokudaro zvichiwedzera kugona kwekuzvitanga. Chikamu che fiber chine custom wavelength division multiplexing - collimator (WDM-Collimator) integrated device, 62 cm ytterbium-doped polarization-maintaining fiber (Yb401-PM, CORACTIVE), uye optical fiber collimator (Col). Fiber ye gain inopombwa ne single-mode 976 nm laser diode (LD) ine simba guru repombi re 1.4 W. Chikamu chekurudyi chine hafu-wave plate (HWP), polarization beam splitter (PBS), grating pair (LightSmyth T-1000-1040-3212-94), uye total reflection mirror (M2). Transmission grating pair ine line density ye 1000 lines/mm inopa intra-cavity dispersion compensation. Daro riri pakati pema grating maviri rinogona kugadziriswa ne stage. Free space length kubva ku collimator kusvika kuma reflection mirror maviri kumativi ese i 5.5 cm uye 6.5 cm zvichiteerana.laserinoburitsa mapulse nenzira yakapatsanurwa kubva kuPBS.
Musimboti wekushanda:
Kutanga kweropa kwakajairwa kunopfuudzwa kuburikidza ne intracavity loop kunotangira kubva kuPBS uye kunopfuudzwa kuM1. Pakutanga, HWP inoputsa kupwanya kuita zvikamu zviviri zve orthogonal, yobva yapinda mu polarization-preserving optical fiber yopararira pamwe chete ne fast and slow axes. Intensity ratio yema pulses ari pamwe chete ne orthogonal axes maviri inotsanangurwa ne rotation angle (θh) ye HWP. Munguva yekupararira mukati me optical fiber, nekuda kwe nonlinear effects, asymmetric intensity yema orthogonal polarized pulses inokonzera intensity-related nonlinear phase shifts. End mirror M1 inobvumira orthogonal pulses kuti ipfuure ne phase shifter kaviri yodzokera ku polarization-preserving optical fiber. Orthogonal pulses inowana π/2 non-reciprocal phase shift uye ichichinjana propagation optical axis. Kusawirirana kweboka pakati pe orthogonal polarized pulses kunotungamira mukubhadhara deviation effect. Pakupedzisira, kupwanya kunounganidza nonlinear phase shifts dzakasiyana uye kunokanganiswa paPBS. Semushonga wepolarizer, PBS inobvumira kuti polarization state pulses ipfuure nepakati, nepo zvimwe zvese zvichiratidzwa kunze kwegomba. Maitiro aya anoita basa remushonga wekugadzira unonyungudutsa mugomba iri rakatsetseka.laser yemazisoKana daro repair yegrating radzikiswa kusvika pa3.2 mm, mupendero wekuruboshwe wespectrum unova wakadzika zvakanyanya. Panguva ino, kupararira kwe cavity net kwakanaka, uye simba guru re 3.57 nJ rinowanikwa. Nzira ye pulse self-correlation trace inowanikwa nekudzvanywa kwekunze kwe pulse ine width ye 39.8 nm spectral yakafara inoiswa neGaussian function, iyo iri 66 fs.
Nguva yekutumira: Kukadzi-25-2026