I. O. Kinyaevskiy, M. V. Ionin, A. V. Koribut, Ya. V. Grudtsyn, Yu. M. Klimachev, D. V. Badikov
{"title":"飞秒Ti：蓝宝石激光脉冲泵浦非线性BaGa2GeS6晶体i型和ii型相位匹配导致的“双色”差频产生","authors":"I. O. Kinyaevskiy, M. V. Ionin, A. V. Koribut, Ya. V. Grudtsyn, Yu. M. Klimachev, D. V. Badikov","doi":"10.1134/S0021364026600655","DOIUrl":null,"url":null,"abstract":"<p>The difference frequency generation of femtosecond Ti:sapphire laser pulses in the wavelength range of 5‒10 μm in a 2.46-mm-long nonlinear BaGa<sub>2</sub>GeS<sub>6</sub> crystal has been experimentally studied. The energy of difference frequency radiation pulses has reached 23 μJ. It has been found that “two-color” difference frequency generation occurs in BaGa<sub>2</sub>GeS<sub>6</sub> simultaneously due to type-I and type-II phase matching, leading to the appearance of two ~0.5 μm wide spectral bands in the mid-infrared range separated by 1.5–2 μm. The influence of the polar and azimuthal angles of BaGa<sub>2</sub>GeS<sub>6</sub> on the spectral and energy characteristics of the two-color radiation has been demonstrated. The resulting two-color radiation can be used for remote gas analysis by the differential absorption method.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 8","pages":"514 - 520"},"PeriodicalIF":1.1000,"publicationDate":"2026-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"“Two-Color” Difference Frequency Generation Due to Type-I and Type-II Phase Matching in a Nonlinear BaGa2GeS6 Crystal Pumped by Femtosecond Ti:Sapphire Laser Pulses\",\"authors\":\"I. O. Kinyaevskiy, M. V. Ionin, A. V. Koribut, Ya. V. Grudtsyn, Yu. M. Klimachev, D. V. Badikov\",\"doi\":\"10.1134/S0021364026600655\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The difference frequency generation of femtosecond Ti:sapphire laser pulses in the wavelength range of 5‒10 μm in a 2.46-mm-long nonlinear BaGa<sub>2</sub>GeS<sub>6</sub> crystal has been experimentally studied. The energy of difference frequency radiation pulses has reached 23 μJ. It has been found that “two-color” difference frequency generation occurs in BaGa<sub>2</sub>GeS<sub>6</sub> simultaneously due to type-I and type-II phase matching, leading to the appearance of two ~0.5 μm wide spectral bands in the mid-infrared range separated by 1.5–2 μm. The influence of the polar and azimuthal angles of BaGa<sub>2</sub>GeS<sub>6</sub> on the spectral and energy characteristics of the two-color radiation has been demonstrated. The resulting two-color radiation can be used for remote gas analysis by the differential absorption method.</p>\",\"PeriodicalId\":604,\"journal\":{\"name\":\"JETP Letters\",\"volume\":\"123 8\",\"pages\":\"514 - 520\"},\"PeriodicalIF\":1.1000,\"publicationDate\":\"2026-05-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"JETP Letters\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S0021364026600655\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"PHYSICS, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"JETP Letters","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S0021364026600655","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
“Two-Color” Difference Frequency Generation Due to Type-I and Type-II Phase Matching in a Nonlinear BaGa2GeS6 Crystal Pumped by Femtosecond Ti:Sapphire Laser Pulses
The difference frequency generation of femtosecond Ti:sapphire laser pulses in the wavelength range of 5‒10 μm in a 2.46-mm-long nonlinear BaGa2GeS6 crystal has been experimentally studied. The energy of difference frequency radiation pulses has reached 23 μJ. It has been found that “two-color” difference frequency generation occurs in BaGa2GeS6 simultaneously due to type-I and type-II phase matching, leading to the appearance of two ~0.5 μm wide spectral bands in the mid-infrared range separated by 1.5–2 μm. The influence of the polar and azimuthal angles of BaGa2GeS6 on the spectral and energy characteristics of the two-color radiation has been demonstrated. The resulting two-color radiation can be used for remote gas analysis by the differential absorption method.
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