Kuyeza m'lifupi mwa mzere wa laser yopapatiza-m'lifupi

Muyeso wa m'lifupi mwa mzerelaser yopapatiza yokhala ndi mzere wopapatiza

M'lifupi mwa laser yopapatiza, makamaka ya ma laser afupipafupi amodzi, amatanthauza m'lifupi mwa sipekitiramu ya laser (nthawi zambiri imakhala theka la m'lifupi mpaka FWHM yonse). Mwachidule, m'lifupi mwa mphamvu ya spectral ya mphamvu ya magetsi ojambulidwa imafotokozedwa malinga ndi mafupipafupi, nambala ya mafunde kapena kutalika kwa mafunde. M'lifupi mwa mzere wa laser muli mgwirizano wapafupi kwambiri ndi nthawi ndipo umadziwika ndi nthawi yogwirizana ndi kutalika kwa mgwirizano. Ngati gawolo likudutsa kusintha kopanda malire, ndiye kuti phokoso la gawo limapanga mzere, zomwe zimachitika ndi oscillator yaulere. Kusinthasintha kwa magawo komwe kumakhala mkati mwa gawo laling'ono kwambiri kumabweretsa mzere wa 0 ndi mbali ina ya phokoso. Kutayika kwa kutalika kwa resonant cavity kumathandizanso m'lifupi mwa mzere ndipo kumapangitsa kuti kudalira nthawi yoyezera. Izi zikusonyeza kuti m'lifupi mwa mzere kapena mawonekedwe a sipekitiramu (mtundu wa mzere) sikungapereke chidziwitso chonse chokhudzasipekitiramu ya laser.

Njira zambiri zitha kugwiritsidwa ntchito poyesamzere wa laser:

Ngati chiŵerengero cha mzere ndi chachikulu (>10GHz, pamene pali kusinthasintha kwa ma mode angapo m'ma cavities a resonant a ma laser angapo), spectrometer yachikhalidwe yogwiritsa ntchito diffraction grating ingagwiritsidwe ntchito poyesa. N'zovuta kwambiri kupeza high frequency resolution pogwiritsa ntchito njira iyi.

Njira ina ndikugwiritsa ntchito chosiyanitsa ma frequency kuti musinthe ma frequency fluctuation kukhala intensity fluctuation. Chosiyanitsacho chingakhale unbalanced interferometer kapena high-precision reference cavity. Resolution ya njira yoyezera iyi nayonso ndi yochepa kwambiri.

3. Ma laser a single-frequency nthawi zambiri amagwiritsa ntchito njira yodziyimira payokha, yomwe imalemba kugunda pakati pa kutulutsa kwa laser ndi yokha pambuyo pa frequency offset ndi delay.

Pamene m'lifupi mwa mzere ndi mazana angapo a Hertz, njira yachikhalidwe ya heterodyne si yothandiza chifukwa nthawi ino pamafunika nthawi yayitali yochedwetsa. Chingwe chozungulira cha ulusi ndi chowonjezera chamkati cha ulusi chingagwiritsidwe ntchito kuti chikule.

5. Kuchuluka kwa kuwala kwa kuwala kwa laser kumatha kupezeka polemba ma kugunda kwa ma laser awiri odziyimira pawokha. Pakadali pano, phokoso la laser yowunikira ndi lotsika kwambiri kuposa la mayeso.laser, kapena zizindikiro za magwiridwe antchito a ziwirizi ndizofanana. Kusiyana kwa ma frequency nthawi yomweyo kungapezeke pogwiritsa ntchito phase-locked loop kapena kudzera mu kuwerengera kutengera zolemba zamasamu. Njirayi ndi yosavuta komanso yokhazikika, koma imafuna laser ina (yogwira ntchito pafupi ndi ma frequency a test laser). Ngati m'lifupi mwa mzere woyezedwa ukufuna ma spectral osiyanasiyana, ndikosavuta kugwiritsa ntchito chisa cha ma frequency.

Kuyeza ma frequency a kuwala nthawi zambiri kumafuna ma frequency enaake (kapena nthawi) nthawi ina. Pa laser yopapatiza, kuwala kamodzi kokha kumafunika kuti kupereke ma frequency olondola mokwanira. Njira ya heterodyne imapeza ma frequency reference pogwiritsa ntchito kuchedwa kwa nthawi yayitali kuchokera ku chipangizo choyesera chokha. Mwanjira yabwino, imapewa mgwirizano wa nthawi pakati pa kuwala koyambirira ndi kuwala kwake kochedwa. Chifukwa chake, ulusi wautali nthawi zambiri umagwiritsidwa ntchito. Komabe, chifukwa cha kusinthasintha kokhazikika ndi zotsatira za mawu, ulusi wautali ukhoza kuyambitsa phokoso lowonjezera la gawo.