Inconel optical constants
nm
NK
250	1.5564	1.7157
260	1.5372	1.6853
270	1.582	1.6824
280	1.6141	1.7016
290	1.6203	1.7003
300	1.6205	1.7202
310	1.6289	1.7419
320	1.6359	1.7733
330	1.6402	1.8074
340	1.6441	1.8434
350	1.65	1.8851
360	1.6593	1.9287
370	1.6676	1.9723
380	1.6806	2.0186
390	1.6936	2.0654
400	1.7096	2.1133
410	1.7273	2.1591
420	1.7465	2.2054
430	1.7672	2.2509
440	1.7877	2.2964
450	1.81	2.3424
460	1.8334	2.385
470	1.8569	2.4262
480	1.8814	2.468
490	1.9057	2.5085
500	1.9297	2.5479
510	1.9525	2.5897
520	1.9789	2.6246
530	2.0074	2.6627
540	2.0332	2.6985
550	2.0578	2.7341
560	2.0866	2.769
570	2.1124	2.8027
580	2.1394	2.8348
590	2.1655	2.8663
600	2.1888	2.8984
610	2.2134	2.9304
620	2.2404	2.9605
630	2.2616	2.99
640	2.2873	3.0195
650	2.31	3.0479
660	2.3351	3.0773
670	2.359	3.1049
680	2.3804	3.133
690	2.4035	3.1603
700	2.4268	3.1869
710	2.4478	3.2164
720	2.4698	3.2417
730	2.4915	3.2691
740	2.5116	3.2953
750	2.5333	3.3216
760	2.5534	3.3465
770	2.5764	3.3749
780	2.5947	3.3994
790	2.6149	3.4248
800	2.6348	3.4499
810	2.6558	3.4746
820	2.6744	3.5
830	2.6919	3.5298
840	2.713	3.5502
850	2.7243	3.5646
860	2.7504	3.6002
870	2.769	3.6261
880	2.7967	3.6622
890	2.8167	3.6941
900	2.8234	3.7014
910	2.8414	3.7256
920	2.8569	3.7485
930	2.8797	3.7753
940	2.8928	3.7956
950	2.9144	3.8244
960	2.9321	3.8482
970	2.9499	3.8728
980	2.9619	3.89
990	2.9799	3.9144
1000	2.9999	3.9454