Na musamman na laser mai sauri sosai kashi na ɗaya

Na Musammanlaser mai sauri sosaikashi na daya

Halaye na musamman na ultrafastna'urorin laser
Tsawon lokacin bugun laser mai sauri yana ba wa waɗannan tsarin halaye na musamman waɗanda suka bambanta su da laser mai tsayi ko mai ci gaba da bugun (CW). Domin samar da irin wannan gajeren bugun, ana buƙatar bandwidth mai faɗi. Siffar bugun jini da tsawon tsayi na tsakiya suna ƙayyade mafi ƙarancin bandwidth da ake buƙata don samar da bugun jini na wani takamaiman lokaci. Yawanci, wannan alaƙar an bayyana ta ne ta hanyar samfurin bandwidth na lokaci (TBP), wanda aka samo daga ƙa'idar rashin tabbas. An ba da TBP na bugun Gaussian ta hanyar dabara mai zuwa:TBPGaussian=ΔτΔν≈0.441
Δτ shine tsawon bugun jini kuma Δv shine mitar bandwidth. A takaice, lissafin yana nuna cewa akwai dangantaka mai juzu'i tsakanin bandwidth na bakan da tsawon bugun jini, ma'ana yayin da tsawon bugun jini ke raguwa, bandwidth da ake buƙata don samar da wannan bugun yana ƙaruwa. Hoto na 1 ya nuna mafi ƙarancin bandwidth da ake buƙata don tallafawa tsawon bugun jini daban-daban.

Hoto na 1: Mafi ƙarancin bandwidth na gani da ake buƙata don tallafawabugun laserna 10 ps (kore), 500 fs (shuɗi), da 50 fs (ja)

Kalubalen fasaha na lasers masu sauri
Dole ne a sarrafa bandwidth mai faɗi, ƙarfin kololuwa, da kuma ɗan gajeren lokacin bugun laser mai sauri a cikin tsarin ku. Sau da yawa, ɗaya daga cikin mafi sauƙi mafita ga waɗannan ƙalubalen shine fitowar laser mai faɗi. Idan kun yi amfani da laser mai tsayi ko laser mai ci gaba a baya, kayan aikin gani da kuke da su a yanzu ba za su iya nuna ko watsa cikakken bandwidth na bugun ultrafast ba.

Matsakaicin lalacewar laser
Na'urorin hangen nesa masu saurin gaske suma suna da bambanci sosai kuma suna da wahalar kewaya maƙasudin lalacewar laser (LDT) idan aka kwatanta da na'urorin hangen nesa na laser na gargajiya.nanosecond pulsed lasers, ƙimar LDT yawanci tana cikin tsari na 5-10 J/cm2. Ga na'urorin gani masu sauri, ƙimar wannan girman ba a taɓa jin ta ba, domin ƙimar LDT tana da yuwuwar kasancewa akan tsari na <1 J/cm2, yawanci kusa da 0.3 J/cm2. Babban bambancin girman LDT a ƙarƙashin tsawon bugun jini daban-daban sakamakon tsarin lalacewar laser ne bisa ga tsawon bugun jini. Ga nanosecond lasers ko fiyena'urorin laser masu bugun jiniBabban hanyar da ke haifar da lalacewa ita ce dumamar zafi. Kayan rufi da substrate nana'urorin ganiShanye photons ɗin da suka faru sannan a dumama su. Wannan na iya haifar da karkacewar layin lu'ulu'u na kayan. Faɗaɗawar zafi, fashewa, narkewa da kuma nau'in lattice sune hanyoyin lalata zafi na waɗannanMajiyoyin Laser.

Duk da haka, ga na'urorin laser masu sauri, tsawon lokacin bugun da kansa ya fi sauri fiye da lokacin canja wurin zafi daga laser zuwa layin kayan, don haka tasirin zafi ba shine babban dalilin lalacewar da laser ke haifarwa ba. Madadin haka, ƙarfin kololuwar na'urar laser mai sauri yana canza tsarin lalacewa zuwa hanyoyin da ba na layi ba kamar sha da yawa na photon da ionization. Wannan shine dalilin da ya sa ba zai yiwu a rage ƙimar LDT na bugun nanosecond zuwa na bugun da ba na sauri ba, saboda tsarin lalacewa na zahiri ya bambanta. Saboda haka, a ƙarƙashin yanayi iri ɗaya na amfani (misali, tsawon rai, tsawon bugun jini, da yawan maimaitawa), na'urar gani mai isasshen ƙimar LDT za ta zama mafi kyawun na'urar gani don takamaiman aikace-aikacen ku. Na'urar gani da aka gwada a ƙarƙashin yanayi daban-daban ba ta wakiltar ainihin aikin na'urorin gani iri ɗaya a cikin tsarin ba.

Hoto na 1: Hanyoyin lalacewar da laser ke haifarwa tare da tsawon lokacin bugun jini daban-daban