Quantum Instruments Cascade Laser Starter Kit Manual de usuario descargar pdf (Pagina 58)

Starter Kit Instruction Manual Appendix 57

Dangers and dis advantages of using a Bias-T

circuit

• Since a Bias-T only allows to heat the laser,

the emission wavelength can only be increased

(or emission wavenumber decreased), and out-

put power will decrease with increased Bias

current, due to the additional heating.

This means that the laser should be operated

initially at lowest possible temperature

• Heating of the active z one will increase ther-

mal stress of the laser, therefore the exp e cted

lifetime will decrease more rapidly compared

to increasing the temper ature of the laser sub-

mount and base in total.

If operation at only a ﬁxed wavelength is needed,

this should be adjusted w ith the overall tem-

perature control.

• Too high a DC Bias current can immediately

destroy the laser due to catastrophic thermal

roll-over. Therefore set-up of the Bias current

has to be done only by instructed pers onnel,

and after checking with Alpes Lasers SA for

allowed parameter ranges; otherwise warranty

will be lost.

What has to be kept in mind before use?

• All use of a Bias-T on a speciﬁc QC laser has

to b e accepted by Alpes Lase rs SA be fo re;

otherwise all warranty will be lost.

• The Bias-T should never be used a t the high-

est speciﬁed current or output power, other-

wise the risk of thermal roll-over failure is im-

minent.

• If optical output power can be monitored, this

should be used during set-up of the Bias-T to

make sure that thermal roll-over is no t reached:

Temporary increasing of the pulse current must

always result in increased optical power out-

put, otherwise the DC Bias cur rent is already

too high.

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