Kushandiswa kweSingle Frequency Semiconductor Laser mukuyera kwakaringana kweLight Wave Interference

Kushandiswa kweLaser yeSimbiconductor Inowanzo shandiswa Kamwe KamwemuKuyera Kwakarurama Kwekupindirana Kwemafungu Echiedza
Kushandiswa kwefrequency imwe chetelaser ye semiconductorMuminda yekuyera nemazvo yakadai sefiber optic hydrophones uye ground listening interferometers zvinokurukurwa, uye kukanganisa kukuru kwekushanda kwelaser pakushanda kwemasystem einterferometer kunoongororwa zvakadzama.

Magadzirirwo epakati uye musimboti wekushanda kwesystem: Sisitimu ye fiber optic hydrophone inonyanya kuumbwa nemusoro unonzwa uye interferometer (tichitora MZ interferometer semuenzaniso). Musimboti wekutanga ndewekuti chiratidzo cheruzha (kumanikidzwa kweruzha Δ p) chinoshanda pamusoro unonzwa, zvichikonzera shanduko muhurefu uye refractive index ye fiber inonzwa yakaputirwa pa silinda isina chinhu, nokudaro zvichiunza shanduko munzira ye optical. Iyi shanduko diki ye optical path (kureva phase change) inowanikwa nekunzwa kwakanyanya ne interferometer.

1. Musoro weSensor: Basa guru rayo nderekushandura kurira kweruzha kuita shanduko munzira ye optical ye interferometer. Sensitivity coefficient s ine chekuita nezvinhu zvakaita se fiber length L, uye ma fibers anonzwa kwenguva refu anobatsira pakuvandudza system sensitivity.
2. Interferometer: Ndiyo "chombo chakanakisa" chekuona shanduko diki dzechikamu. Kusimba kwechiedza chinobuda kune hukama hwecosine nemusiyano wechikamu. Nekudzikamisa static phase bias φ ₀ panzvimbo yekushanda ye orthogonal ((m+1/2) π), sisitimu inogona kuwana kunzwisisika kwakanyanya kwekuona.
3. Maparamita makuru echiedza anokanganisa mashandiro esystem: Chinyorwa ichi chinotarisa pakuongorora miganhu yekushanda kwelaser pakuwana resolution yepamusoro (nechinangwa che ≤ 1 μ rad).
4. Laserruzha rwefrequency uye linewidth: Ruzha rwefrequency rwelaser runogona kukonzera interference phase noise, nokudaro zvichideredza kuonekwa kweinterference fringes. Kune interferometer ine optical path difference yeinenge mita imwe, kuti iwane phase resolution ye1 μ rad, linewidth yelaser inofanira kunge iri pasi pe30 Hz. Ichi chinodiwa zvakanyanya kuti frequency igare zvakanaka.chiedza chinobva.
5. Ruzha rweLaser: Ruzha rweRelative Intensity Noise (RIN) rweLaser ruchashandurwa zvakananga kuita Phase Error yeInterference Signal. Kuti uwane Phase Resolution ye1 μ Rad paPower yeJanji reKuona (~100 μ W), RIN yeLaser inofanira kuderedzwa kusvika pasi pe -120 dB. Ichi chinodiwa zvakanyanya kuti chiedza chirambe chakasimba.

Muchidimbu, nekuongorora fiber optic hydrophone system, zvinodiwa zvakasimba zve core light source - single frequency semiconductor laser - maererano ne linewidth yakamanikana (high frequency stability) uye ruzha rwakaderera zvakanyanya mukuyera kwakarurama zvichibva panheyo yekupindira zvinotsanangurwa, uye matambudziko e laser frequency stabilization anotarisana nawo mumashandisirwo makuru esystem anoratidzwa.