Laser Diode Parameters, Cov Ntsiab Cai thiab Daim Ntawv Thov

Lub hauv paus ntsiab lus ua haujlwm ntawm semiconductor laser diodes yog theoretically tib yam li cov roj lasers.
Lub laser diode yog qhov tseem ceeb ntawm semiconductor diode. Raws li seb cov khoom siv PN hlws ris zoo ib yam, lub laser diode tuaj yeem muab faib ua homojunction, ib leeg heterojunction (SH), ob chav heterojunction (DH) thiab quantum well (QW) laser diodes. Quantum zoo laser diodes muaj qhov zoo ntawm qhov pib qis tam sim no thiab siab tso zis zog, thiab tam sim no cov khoom tseem ceeb hauv kev ua lag luam. Piv nrog cov lasers, laser diodes muaj qhov zoo ntawm kev ua haujlwm siab, me me, thiab lub neej ntev. Txawm li cas los xij, lawv lub zog tso zis me me (feem ntau tsawg dua 2mW), tsis zoo linearity, thiab monochromaticity tsis zoo, uas txwv lawv daim ntawv thov hauv cable TV systems. Tsawg heev, tsis tuaj yeem kis tau ntau-channel, ua haujlwm siab analog teeb liab. Nyob rau hauv lub backhaul module ntawm ib tug bidirectional optical receiver, quantum zoo laser diodes feem ntau yog siv raws li lub teeb qhov chaw rau uplink kis tau tus mob.

Laser Diode Essence
Lub laser diode yog qhov tseem ceeb ntawm semiconductor diode. Raws li seb cov khoom siv PN hlws ris zoo ib yam, lub laser diode tuaj yeem muab faib ua homojunction, ib leeg heterojunction (SH), ob chav heterojunction (DH) thiab quantum well (QW) laser diodes. Quantum zoo laser diodes muaj qhov zoo ntawm qhov pib qis tam sim no thiab siab tso zis zog, thiab tam sim no cov khoom tseem ceeb hauv kev ua lag luam. Piv nrog cov lasers, laser diodes muaj qhov zoo ntawm kev ua haujlwm siab, me me, thiab lub neej ntev. Txawm li cas los xij, lawv lub zog tso zis me me (feem ntau tsawg dua 2mW), tsis zoo linearity, thiab monochromaticity tsis zoo, uas txwv lawv daim ntawv thov hauv cable TV systems. Tsawg heev, tsis tuaj yeem kis tau ntau-channel, ua haujlwm siab analog teeb liab. Nyob rau hauv lub backhaul module ntawm ib tug bidirectional optical receiver, quantum zoo laser diodes feem ntau yog siv raws li lub teeb qhov chaw rau uplink kis tau tus mob.

Cov qauv yooj yim ntawm semiconductor laser diode yog raws li qhia hauv daim duab. Ib khub ntawm cov dav hlau sib npaug perpendicular mus rau PN kev sib tshuam ua rau Fabry-Perot resonant kab noj hniav. Lawv tuaj yeem yog cleavage dav hlau ntawm semiconductor siv lead ua lossis polished dav hlau. Qhov seem ob sab yog qhov ntxhib heev los tshem tawm cov nyhuv laser hauv lwm cov lus qhia tshwj tsis yog lub ntsiab lus tseem ceeb.

Hauv kev ua haujlwm tshwj xeeb, PN kev sib tshuam ntawm lub laser diode yog tsim los ntawm ob txheej doped gallium arsenide. Nws muaj ob lub tiaj tiaj-kawg, ib qho mirrored thaum uas tig mus rau qhov kawg (ib qho kev cuam tshuam zoo heev) thiab ib feem cuam tshuam. Lub wavelength ntawm lub teeb yuav tsum tau emission yog raws nraim nrog rau qhov ntev ntawm qhov sib koom ua ke. Thaum lub PN hlws ris yog rau pem hauv ntej biased los ntawm ib tug sab nraud voltage qhov chaw, electrons txav los ntawm kev sib tshuam thiab recombine zoo li ib txwm diode. Thaum electrons recombine nrog lub qhov, photons raug tso tawm. Cov photons no ntaus cov atoms, ua rau ntau photons tso tawm. Raws li qhov kev tsis ncaj ncees rau pem hauv ntej nce, ntau electrons nkag mus rau hauv cheeb tsam depletion thiab ua rau ntau photons raug tso tawm.

Muaj ob hom kev siv laser diodes: ①PIN photodiode. Thaum nws tau txais lub zog kho qhov muag thiab tsim cov duab photocurrent, nws yuav ua rau lub suab nrov quantum. ②Avalanche photodiode. Nws muab kev nthuav dav sab hauv thiab tuaj yeem xa mus deb dua li tus PIN photodiode, tab sis muaj suab nrov dua quantum. Txhawm rau kom tau txais lub teeb liab-rau-nruab sib piv zoo, lub suab nrov qis preamplifier thiab lub suab nrov loj yuav tsum tau txuas nrog tom qab cov cuab yeej photodetection.

Feem ntau siv tsis tau ntawm semiconductor laser diodes yog:
(1) Wavelength: uas yog, ua haujlwm wavelength ntawm lub laser raj. Tam sim no, lub wavelengths ntawm laser raj uas yuav siv tau raws li photoelectric keyboards muaj xws li 635nm, 650nm, 670nm, 690nm, 780nm, 810nm, 860nm, 980nm, thiab lwm yam.

(2) Qhov pib tam sim no Ith: uas yog, tam sim no ntawm lub laser raj pib tsim laser oscillation. Rau cov tshuab hluav taws xob qis qis, nws tus nqi yog li kaum milliamperes. Qhov chaw pib tam sim no ntawm cov raj laser nrog ntau hom quantum zoo qauv tuaj yeem ua rau qis li 10mA. cov hauv qab no.

(3) Kev khiav hauj lwm tam sim no Iop: Qhov ntawd yog, kev tsav tsheb tam sim no thaum lub raj laser ncav cuag lub zog tso zis. Tus nqi no yog ib qho tseem ceeb rau kev tsim thiab debugging lub laser tsav Circuit Court.

(4) Vertical divergence angle θ⊥: Lub kaum sab xis ntawm lub luminous sawb ntawm lub laser diode qhib nyob rau hauv cov kev taw qhia perpendicular mus rau PN hlws ris, feem ntau nyob ib ncig ntawm 15 degree ~ 40 degree.

(5) Kab rov tav divergence lub kaum sab xis θ∥: Lub kaum sab xis ntawm lub luminous band ntawm lub laser diode qhib nyob rau hauv cov kev taw qhia thaum uas tig mus rau lub PN hlws ris, feem ntau nyob ib ncig ntawm 6 degree ~ 10 degree.

(6) Kev soj ntsuam tam sim no Im: uas yog, tam sim no ntws los ntawm tus PIN raj thaum lub raj laser nyob ntawm qhov ntsuas hluav taws xob.

Nyob rau hauv lub neej tiag tiag, laser diodes yog dav siv nyob rau hauv cov ntaub ntawv science teb, xws li optical fiber kev sib txuas lus, kho qhov muag disk cia, luam ntawv thiab luam, thiab kho mob cosmetology. Rau cov kev siv tshwj xeeb, kev xaiv yuav tsum tau ua ke nrog nws cov ntsiab lus tseem ceeb, suav nrog wavelength, tso zis hluav taws xob, kev khiav hauj lwm tam sim no, kev khiav hauj lwm voltage, thiab lwm yam. taub hau hauv laser printers.

Cov ntaub ntawv tiv tauj:

Yog tias koj muaj lus nug, thov hu rau peb. Txawm peb cov neeg muas zaub nyob qhov twg thiab peb cov kev xav tau yog dab tsi, peb yuav ua raws li peb lub hom phiaj los muab peb cov neeg siv khoom zoo, tus nqi qis, thiab kev pabcuam zoo tshaj plaws.