Ultrashort Long-Period Fiber Grating Sensors Inscribed on a Single Mode Fiber Using <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-4.1996pt" id="M1" height="15.6076pt" version="1.1" viewBox="-0.0657574 -11.408 31.7722 15.6076" width="31.7722pt"><g transform="matrix(.017,0,0,-0.017,0,0)"><path id="g187-68" d="M625 186C574 85 512 32 429 32C293 32 194 153 194 337C194 485 274 621 419 621C496 621 573 586 606 468L643 475C636 537 629 583 620 638C593 644 519 665 438 665C199 665 42 523 42 317C42 158 152 -15 418 -15C486 -15 578 5 604 11C621 46 647 122 660 171L625 186Z"/></g><g transform="matrix(.017,0,0,-0.017,11.79,0)"><path id="g187-80" d="M394 664C165 664 42 495 42 323C42 132 181 -15 381 -15C570 -15 725 116 725 332C725 529 576 664 394 664ZM374 622C491 622 571 503 571 304C571 120 494 27 399 27C271 27 196 171 196 343C196 516 274 622 374 622Z"/></g><g transform="matrix(.012,0,0,-0.012,25.027,4.134)"><path id="g187-243" d="M442 172C405 109 393 108 333 108H171L289 222C383 315 430 374 430 457C430 569 349 635 249 635C187 635 134 610 97 573L34 478L61 455C93 502 136 542 196 542C265 542 300 491 300 422C300 346 261 273 191 190C142 132 84 76 31 25V0H432C443 42 455 105 471 163L442 172Z"/></g></svg> Laser Radiation

<div>Phase matching curves, for a 6 mm length grating; <svg height="6.1673pt" id="M56" style="vertical-align:-0.2063904pt" version="1.1" viewbox="-0.0498162 -5.96091 10.3951 6.1673" width="10.3951pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M766 88L752 113C719 83 690 64 681 64C674 64 672 74 679 103L724 292C758 436 724 448 701 448C680 448 666 442 639 429C594 407 514 350 441 252H439L447 289C476 423 450 448 419 448C398 448 379 441 355 427C307 400 234 344 162 249H160L180 324C203 409 197 448 170 448C144 448 82 413 23 349L35 321C57 343 96 374 108 374C115 374 117 371 111 341C87 227 57 112 24 -6L32 -12C53 -4 81 4 108 6C119 68 134 128 149 171C177 229 309 383 364 383C387 383 388 355 373 282C354 190 330 92 303 -6L309 -12C332 -4 356 3 386 6C396 63 411 122 424 171C458 236 590 383 642 383C658 383 664 369 652 315L603 91C587 20 593 -12 619 -12C642 -12 708 23 766 88Z" id="g113-110"></path></g></svg> indicates the order of the mode.</div>

Journal of Sensors

fig2

Figure 2

Figure 2: Ultrashort Long-Period Fiber Grating Sensors Inscribed on a Single Mode Fiber Using <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-4.1996pt" id="M1" height="15.6076pt" version="1.1" viewBox="-0.0657574 -11.408 31.7722 15.6076" width="31.7722pt"><g transform="matrix(.017,0,0,-0.017,0,0)"><path id="g187-68" d="M625 186C574 85 512 32 429 32C293 32 194 153 194 337C194 485 274 621 419 621C496 621 573 586 606 468L643 475C636 537 629 583 620 638C593 644 519 665 438 665C199 665 42 523 42 317C42 158 152 -15 418 -15C486 -15 578 5 604 11C621 46 647 122 660 171L625 186Z"/></g><g transform="matrix(.017,0,0,-0.017,11.79,0)"><path id="g187-80" d="M394 664C165 664 42 495 42 323C42 132 181 -15 381 -15C570 -15 725 116 725 332C725 529 576 664 394 664ZM374 622C491 622 571 503 571 304C571 120 494 27 399 27C271 27 196 171 196 343C196 516 274 622 374 622Z"/></g><g transform="matrix(.012,0,0,-0.012,25.027,4.134)"><path id="g187-243" d="M442 172C405 109 393 108 333 108H171L289 222C383 315 430 374 430 457C430 569 349 635 249 635C187 635 134 610 97 573L34 478L61 455C93 502 136 542 196 542C265 542 300 491 300 422C300 346 261 273 191 190C142 132 84 76 31 25V0H432C443 42 455 105 471 163L442 172Z"/></g></svg> Laser Radiation 

Journal of Sensors

Ultrashort Long-Period Fiber Grating Sensors Inscribed on a Single Mode Fiber Using Laser Radiation

Figure 2