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

Table 1

Values of grating length, , found in the literature, for LPFGs written in regular SMF or PCF fibers. designates the grating period.

Reference	Fabrication method	(mm)	Λ (µm)
Slavík [19]	CO2 laser	25–90	415
Wang [20]	CO2 laser	2.8
Rao and Zhu [21]	CO2 laser	30
Vengsarkar et al. [22]	KrF laser	25.4
Rao et al. [23]	CO2 laser	40	2000
Lan et al. [24]	CO2 laser	46
Oh et al. [25]	CO2 laser	42, 47, 50
Li et al. [26]	fs laser	25.2	436
Han et al. [27]	UV light	20	400
Zhang et al. [28]	Laser	22.5 and 23	643, 418, 428
Rindorf and Bang [29]	CO2 laser	49.2, 44.4, 37.2, 34.8	820, 740, 620, 580
Allsop et al. [30]		20	206
Allsop et al. [31]		55, 150	325, 111
Shi et al. [32]		13	435
Wang and Rao [33]	CO2 laser	20
Rao et al. [34]	CO2 laser	19.6	437
Wang and Rao [35]	CO2 laser	27
Bhatia [6, 36]	UV	10	280
Nam et al. [9]	Electric arc	2	500
Duan et al. [7]	fs laser	34	570

Engraved in a PCF (Photonic Crystal Fiber). Not specified.