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µ` dc%i¨vLc ^ cLvLc%WÄsHchq ^ ics¥Rc _ t* dc% ] dâ ]^^ cx~ ?Ltxch dRcEc ^ ecx5tWi|cec ^w^ cxii n vNc~ @?vN n Y ] wRcx ^ c?Ecx*t ^ c?Ecx5~tÀxc:vLc] Rc ^^ ¸ dch d ^ cxEit· ]^^ cx~ ­l c%ikEc ^ trcl¦jsHc?R Wl ¥ c%WiNvLcd?vwNvNE ¾ ] ch c ^ cx~ ikEc ^^ Rkl ] Hs ] E W?ec<ycxcx· ] ch dsHqi _ cxqy~ lcx ] (cxsHE< ^ sHc@E ^ (l½ãäsHr ] xytxc:ic ^ p dt¬ic? ^ i n Rrc ¾

µ ] d ^å ª` ^ J dcx ^ rÃ

Oscilloscope

Laser mount with TE-Cooler

Laser Diode

Collimating Lens, f 1

Function Generator

TE-Cooler Controller

Current Source

Trig

ger

Sig

nal

BN

C C

able

ThorLabs FGA10

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vt G mc: cwq r ]^^ cx~ ܯ?eb*c­ ^ ] dchq ^ cxitstW ^Jn scx ]R^ cxsHcx~ xvNc _ Wii n scx ]^ cx¦ dRc

sitiNtWi ^ cxEqmc< dtVUEql dbc cx ^XW cp ] qÀ¸°chcp chiklc ^ Rbc ¾ ¥kl ]R^^ c~ N d@(sHµ l­c:ß(sÆ`àÎà3sb ] il dt¥sHqif ] RcvLcxiivf dtH c3iRc? ^^ lc(« ^ cxf dc ^ qW ^ scp dc ^ jc ^ c ] if jRv<>t ]^ cUH%qWlc®r

µ ] d ^å ª` ^ J dcx ^ rÃ

OscilloscopeLaser mount

with TE-Cooler

Laser Diode

Collimating Lens, f 1

Function Generator

TE-Cooler Controller

Current Source

Trig

ger

Sig

nal

Bias Resistor

RL

Bias Voltage

ThorLabs FGA10

Signal

Ground

Reference Signal

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! A #" < %$ & J¨

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Fr equen cy (H z)

10 1 10 2 10 3 10 4 10 5

Si g

nal A

m p l

itude

(d B

)

-1 2

-9

-6

-3

0

Ph ot odiod e direct in to 1M Ω sc op e input Photod iode bi as ed at 9V & direct in to scope Photod iode bi as ed at 9V & into 20 k Ω l oad resistor Photod iode bi as ed at 9V & into 20 0 Ω l oad resistor

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Freq uenc y (Hz)

10 1 10 2 10 3 10 4 10 5 10 6

Si g

nal A

mpl

itude

(dB

)

-3 0

-2 4

-1 8

-1 2

-6

0

9V reverse bias, 20 k Ω lo ad re si stor 9V reverse bias, 20 0 Ω lo ad re si stor

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µ ] d ^å ª` ^ J dcx ^ rà ³

Freq uenc y (Hz)

10 1 10 2 10 3 10 4 10 5 10 6

Pha

s e d

e via

t i on

from

driv

in g

s our

ce (

degr

ees )

-3 00

-2 50

-2 00

-1 50

-1 00

-5 0

0

50

10 0

9V reverse bias, 20 0 Ω lo ad re si stor 9V reverse bias, 20 k Ω lo ad re si stor

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; < = rR« ^ %wÆNàÎà®sHr ] ikl ; < = R« ^ :ÆNàÎà®sHr ] ikl

µ¯N ^ cx ] it LÀ cxEcUscx ]R^ cxsHcx~ xrvLc¯Rc¯®sHr ] ikl sHqitt ] c®sÆ`àÎà3« ^ ]^ Es­lii tWi Ç^ cqyEc¯sHc? ]^ cscu 3cxc¬t| ]^ cUH¬r

µ ] d ^å ª` ^ J dcx ^ rà ß

CD KUX MTWÍÐUORG [@XÏ(ÍÐUVYXZÍ[(ËJGwX½TjcwiklE qW ^ 3| jiy ^ l ^En cporqyc ^ sHcx~ i ] Rcxh dcwctl0: ^ EsHqmcWcsHqi _ c ^g] E* dRcYmgÀ¢¼ 0²<±b ¦q sq¸l dc<Ò®Ó>YÔLÕ½Öm×ØÙH²<±~ÑÇwµ¯3 9 qR dbtrcl0µZcs­z dw½ dRjx ^ ] t jtj¨v<> ]^ cw³R

jc(relu dc ] t:g ^ ltsqyc

OP-AMP

PD

V

C

R

bias

F

F

Vout

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