Nzira yekuyera upamhi hwe single frequency laser

Nzira yekuyera upamhi hwemutsaralaser yefrequency imwe chete
Nzira dzakasiyana-siyana dzekuyera upamhi hwe single frequency laser kubva pa coarse kusvika pa fine, pamwe chete nemamiriro adzo anoshanda uye ma technical points, dzakapfupikiswa seizvi:
1, Kuyerwa kwakananga nespectrometer (kuyerwa kwakaoma, upamhi hwemutsara ≥ GHz level)
Shandisa grating spectrometer kana optical spectrometer (OSA) kuti uone kana iri single longitudinal mode, kuyera edge mode suppression ratio uye longitudinal mode linewidth. Iyo optical spectrometer resolution yetsika inenge 0.1-0.01 nm (inoenderana ne0.1-10 GHz ye near-infrared), uye kushanda kwepamusoro kunogona kusvika 1 pm, izvo zvinongokodzera chete kuongorora linewidth yakafara pakutanga.laser.
2, Kuskena Fabry Perot (FP) etalon (mutsetse wakamanikana wepakati)
Yakakodzera ma laser ane upamhi hwemutsara wakamanikana kana nzvimbo diki ye longitudinal mode pane optical spectrometer resolution. Pakuyera, zvakakosha kutonga zvichibva pachiyero che laser linewidth neFP cavity mode width: kana laser linewidth yakakura kupfuura cavity mode width, inogona kuverengwa zvakananga; Kana yakafanana, deconvolution inodiwa; Kana iri diki kupfuura nguva, zvinodikanwa kuitsiva neFP ine kunyatsojeka kana kushandisa edge modeling technology yekufungidzira.
3, Heterodyne/Delay Self Heterodyne uye Self Homodyne (Mutsetse wakamanikana, kHz~MHz range)
Kana laser ine coherence yakakwira inopfuura resolution ye optical spectrometer, nzira ye heterodyne (ine linewidth reference laser inozivikanwa zvakanyanya) kana nzira ye time delayed self heterodyne/self homodyne (isina reference laser) ndiyo inowanzo shandiswa. Mudziyo uyu ifiber Mach Zehnder kana Michelson interferometer, ine nguva inononoka ye τ d_d (inotsanangurwa nemusiyano wehurefu hwefiber) pakati pemaoko maviri;Modulator yeAOMKuchinja kwema frequency kunozviparadzanisa nega, asi kusabatanidzwa nega ndiko kuzviparadzanisa nega. AOM Modulator inogona kushandura ma frequency e beat kubva kuDC kuderedza kupindirana kwema frequency mashoma.
4, Zvekudzivirira:
4.1 Mafiber e optical akareba anokanganiswa nekudzungaira/kudonha kwekushisa, uye kugadzikana kwe interferometer kunofanirwa kuvandudzwa;
4.2 Nzira mbiri dzemagetsi dzinofanira kuenzaniswa, uyeEDFA Optical amplifiermubhadharo kana kuti fiber ring multi cycle interferometer inogona kushandiswa;
4.3 Kana upamhi hwemutsetse hwakanyanya kutetepa, hunogona kuverenga upamhi hwemutsetse hwe20 dB, uye hwobva hwawana upamhi hwemutsetse hwe3 dB zvichibva pachimiro chemutsetse weLorentz;
4.4 Shandisa polarization controller (PC) kana Faraday rotating mirror (FRM) kudzivirira polarization fading.