Page 452 - Tunable Lasers Handbook

41 2 Paul Zorabedian

ARBITRARY PIVOT v.
PIVOT
/ ARCOATING .

I I
,.a- GRATING L1
I
*.#. tan01

-------- i;.l----------..---_.__----------------------------
I
.-e
PIVOT
OPTIMUM
4 L3
FIGURE 37 Location of optimum pivot point in phase-continuous tuned prating extended-
cavity laser. (Reproduced with permission from Trutna and Stokes [112]. @ 1993 IEEE.)

1 1 . CHARACTERIZATION METHODS FOR EXTERNAL-CAVITY LASERS

To design and construct external lasers with well-characterized and reliable
behavior, routine measurement of the laser's properties is essential. Table 7 indi-
cates several commonly measured quantities and the measurement techniques
for each.

12. MEASUREMENT OF FACET AND EXTERNAL-CAVITY REFLECTANCES

12.1 Determination of Gain and Loss Parameters for Solitary
Diode Lasers
To determine the internal gain and loss parameters of the gain medium, the
minimum information required is the threshold current Z, and the original lasing
wavelength A, of the solitary diode laser prior to antireflection coating. The soli-
tary threshold current is given by