NiP optical constants from JAW
nm
NK
250	1.6303	1.5542
260	1.6276	1.5903
270	1.633	1.6422
280	1.6463	1.7
290	1.6737	1.7606
300	1.7052	1.8178
310	1.7572	1.8953
320	1.7943	1.9346
330	1.833	1.9691
340	1.8693	1.9948
350	1.9047	2.0205
360	1.9376	2.0408
370	1.9676	2.0589
380	1.9935	2.0748
390	2.014	2.0897
400	2.0316	2.1077
410	2.046	2.127
420	2.0588	2.1482
430	2.0682	2.1701
440	2.0783	2.1934
450	2.0856	2.2164
460	2.0933	2.244
470	2.1019	2.2739
480	2.1097	2.3044
490	2.1187	2.3375
500	2.1292	2.37
510	2.1391	2.4041
520	2.149	2.4383
530	2.1586	2.4713
540	2.1669	2.5043
550	2.1794	2.5377
560	2.1899	2.5712
570	2.2028	2.6083
580	2.2156	2.6447
590	2.2281	2.6793
600	2.2426	2.7172
610	2.2586	2.7524
620	2.2727	2.7892
630	2.2881	2.8222
640	2.3027	2.8573
650	2.3154	2.8893
660	2.3322	2.9236
670	2.3499	2.9612
680	2.3666	2.9937
690	2.3804	3.0264
700	2.3978	3.0603
710	2.4162	3.0944
720	2.4328	3.127
730	2.4507	3.1573
740	2.465	3.1907
750	2.4791	3.218
760	2.4995	3.2522
770	2.515	3.2834
780	2.5316	3.3153
790	2.5497	3.3472
800	2.5665	3.379
810	2.5853	3.4077
820	2.6018	3.4405
830	2.6175	3.4682
840	2.6303	3.4927
850	2.6504	3.527
860	2.6661	3.5549
870	2.6847	3.587
880	2.6989	3.6163
890	2.7195	3.6446
900	2.7348	3.6771
910	2.7561	3.711
920	2.766	3.7321
930	2.7823	3.7623
940	2.7976	3.7902
950	2.812	3.8153
960	2.8294	3.8446
970	2.8479	3.8752
980	2.8599	3.9044
990	2.8817	3.9358
1000	2.8966	3.9649