½ ¨ 7 Hë H Sae Mulli (The Korean Physical Society), Volume 54, Number 5, 2007¸ 5 Z 4, pp. 409∼412

(1)

½ ¨ 7 Hë H Sae Mulli (The Korean Physical Society), Volume 54, Number 5, 2007¸ 5 Z 4, pp. 409∼412

¤ì Å ® o° Ë Ñ POF; c 8 ý X ¢ LED O þ u §7 _T

L

|ª <" k · »* å ) כ · Ðr ) · , > ÷ 7 B . > ^∗

¸ @ / < Æ § õ < Æ@ / < Æ, Laser Imaging Laboratory, F g Å Ò 501-759 (2007¸ 3 Z 4 1{ 9 ~ Ã Î6 £ §)

POF (Plastic Optical Fiber) _ 9 þ t A × ¼8 £ x` ¦ CO

2

Y Us $ Ð d y # 8 £ ¤ µ 1 Ï F g` ¦ : x ô Ç n Û ¼e ¦ Y Us

¸" î r Û ¼% 7 ` ¦ > hµ 1 Ï % i . POF_ Y Us $ d y ô Ç Â Òì r \ " f F g _ ~ ½ ÓØ ¦` ¦ ] j# Q l 0 A # , POF\ ¦ " f

Ð x 9 Ã Ì÷ &> { 9 § > = Ð & ñ § > = # # QY Us \ ¦ ï r q ô Ç Ê ê Y Us $ ( ç Z O ` ¦ : x K q ] X 8 ú ¤d Ü ¼ Ð POF_ 9 þ t A

×

¼8 £ x \ / å J À ÒÚ Ô\ ¦ + þ A$ í # s p t \ ¦ ë ß [ þ t% 3 . " f Y Us $ / B N ; ¤ x 9 U ·s \ [ O > ) a s p

t Õ ª@ / Ð POF_ ï# Q8 £ x Ü ¼ Ð { 9 ) a LED F g s # QA s _ ³ ð \ " f ç H{ 9 ¦ [ jx 9 > 8 £ ¤ µ 1 Ï F g

H n Û ¼e ¦ Y Us \ ¦ r ½ + É Ã º e % 3 .

PACS numbers: 42.30.Va

Keywords: n Û ¼e ¦ Y Us , 8 £ ¤ µ 1 Ï F g, Y Us $ / B N, e ¦ Û ¼h Ë :F g$ 3 Ä »

I. " e Â ] Ø

e

¦ Û ¼h Ë : F g$ 3 Ä » (POF) H POF ^ \ ç ß é ß ô Ç ¸ ` ¦ :

x K " f F g _ { 9 Â Ò\ ¦ × þ & h Ü ¼ Ð ü @Â Ò Ð Ø ¦ ½ + É Ã º e [1]. s Qô Ç © & h ` ¦ s 6 x # é ß í H ô Ç â ' a ¸" î s ü @\ ³ ð r

© u ¢ ¸ H Ñ þ s h A © u \ ¦ í < Ê H ¸" î © u \ ¦ ½ ¨

$ í

H ½ ¨ Ö ¸ µ 1 Ï . s Qô Ç POF\ ¦ s 6 x ô Ç ¸" î © u

H POF _ 9 þ t A × ¼8 £ x \ Û ¼ß ¼A u \ ¦ Å Ò ¸½ ¨ 1 p x` ¦ s

6 x # 0 A& h Ü ¼ Ð < Ì ¢ ¸ H ` ¦ + þ A$ í H 1 p x : £ ¤& ñ ¸

ª ` ¦ D h " f F g _ < Hz ´` ¦ Ä » ¸ H כ s . t ë ß & ñ x 9 ô

Ç / B N/ B N& ñ _ ] j# Q \ O s H POF U ´s ~ ½ Ó ¾ Ó\ Ø

¦ ÷ & H F g _ 6 f ¸ Ô ¦ç H{ 9 . ¢ ¸ô Ç 9 þ t A × ¼8 £ x _ e _

&

h < H © s l M :ë H \ Ø ¦§ 4 F g s & h & h # Q¿ º# Qt & h

&

h µ 1 ß t H 1 p x Ô ¦ ½ ©g Ë :& h 8 £ ¤ µ 1 Ï F g Ü ¼ Ð K ´ òõ & h

n Û ¼e ¦ Y Us % i ½ + É` ¦ ½ ¨ & ³½ + É Ã º \ O ` ¦ ÷ r ë ß m " é ¶

H s p t \ ¦ & ñ S X ¦ [ jx 9 > è q Ã º \ O H ë H ] j& h

`

¦ t > ) a . { 9 Â Ò ½ ¨\ " f H ¦· ú Ü ¼ Ð ] j\ ¦ ì r

# 9 þ t A × ¼8 £ x` ¦ ? / H ~ ½ ÓZ O Ü ¼ Ð ì r H ] j _

ß ¼l x 9 · ú § 4 _ \ 9 þ t A × ¼8 £ x` ¦ d y ¦ e Ü ¼

ç H{ 9 ô Ç / B N s Ô ¦ 0 p x 9, Û ¼ß ¼\ ¦ s 6 x ô Ç ~ ½ ÓZ O É r

/ B N \ p o Û ¼ß ¼\ ¦ ] j # < ÊÜ ¼ Ð+ q 6 x 1 p x _

7 £ x \ ¦ 4 R` ¦ ÷ r ë ß m { 9 ì ø Í& h Ü ¼ Ð POF_ t 2 £ § s

1 mm ? /ü @s Ù ¼ Ð Û ¼ß ¼_ » 1 ÏÂ Ò Ã Ìs & ³z ´& h Ü ¼ Ð Ô ¦

0 p x 9 ^ & h \ O ´ òÖ ¦ _ $ \ ¦ 4 R ¸ H é ß & h s e

.

∗

E-mail: [email protected]

: r ½ ¨\ " f H s Qô Ç ë H ] j& h ` ¦ K ¦ CO

²

Y U s

$ ü < POF 8 £ ¤ _ d y ¸| \ @ /ô Ç ] j# Q 0 p x ô Ç á Ô

ÐÕ ªÏ þ ` ¦ s 6 x # & ñ x 9 ô Ç / B N` ¦ Ã º' % i [2–5]. s

Qô Ç r Û ¼% 7 ` ¦ Ö ¸6 x # POF\ " f 9 þ t A × ¼8 £ x _ : £ ¤& ñ Â Ò0 A ë

ß ` ¦ Ð & ñ x 9 > / B N < ÊÜ ¼ Ð+ ¾ Ó © ) a ç H{ 9 ô Ç 6 f ¸

\

¦ ° ú H µ 1 Ï F g ^ \ ¦ ½ ¨ & ³½ + É Ã º e % 3 Ü ¼ 9, POF 8 £ ¤ / B N õ

& ñ \ " f d y U ·s \ ¦ " é ¶ Ö ¸ y ¸] X # POF U ´s ~ ½ Ó ¾ Ó Ü

¼ Ð F g Ø ¦ _ ì r í\ ¦ ¸] X ½ + É Ã º e . " f : r

½

¨_ 3 l q& h É r " é ¶ H s p t \ ¦ " é ¶ H ß ¼l x 9 + þ A © Ü ¼ Ð [ O

> ô Ç Ê ê [ O > ) a s p t \ ¦ Y Us $ / B N # POF_ 9 þ t A

× ¼8 £ x` ¦ ] j r ( Ü ¼ Ð+ µ 1 Ï F g r ç H{ 9 ô Ç 6 f ¸ Ð µ 1 Ï F g ÷ &

#

Q f õ Ö ¦ Q é ß í H ô Ç F g _ Ø ¦§ 4 s [ O > ) a s p t Õ

ª@ / Ð n Û ¼e ¦ Y Us ½ + É Ã º e Ü ¼ 9, " é ¶ H LED Ò o © Ü ¼ Ð F

g` ¦ { 9 r & 1 l x o © _ ½ ¨ & ³` ¦ 0 p x > H 8 £ ¤ µ 1 Ï F

g+ þ A e ¦ Û ¼h Ë : F g$ 3 Ä »\ ¦ s 6 x ô Ç ¸" î x 9 n Û ¼e ¦ Y Us r Û

¼% 7 ` ¦ ½ ¨ & ³ H כ s .

II. ÷ m Ç ] M ö

: r z ´+ « >\ 6 x ) a r « Ñ H Fig. 1 \ " fü < ° ú s f â 1 mm _ e ¦ Û ¼h Ë : F g$ 3 Ä » (POF) Ð ï# Q H Ï ã J] X Ò ¦ 1.49 _ PMMA (Poly Methyl Methacrylate) Ð f â 980 µms 9, 9 þ t A × ¼8 £ x É r Fluorinated polymer Ð step index_ Ï ã J ] X

Ò ¦ Ð 10 µm ¿ ºa _ : £ ¤$ í ` ¦ t ¦ e . s ü < ° ú É r r

« Ñ\ " f 8 £ ¤ Ü ¼ Ð_ F g Ø ¦` ¦ Ä » ¸ l 0 AK á Ô ÐÕ ªÏ þ

-409-

(2)

-410- ô Ç² D GÓ ü t o < Æ rt “D hÓ ü t o ”, Volume 54, Number 5, 2007¸ 5 Z 4

Fig. 1. The structure of plastic optical fiber (POF).

Fig. 2. The schematic diagram of CO

2

laser marking system.

\

_ K p o n ) a s p t \ ¦ U ·s 5 ∼ 50 µm, ; ¤ 70

∼ 150 µm Ð l 2 ¤ Y Us $ _ ¸ Ø ¦§ 4 ` ¦ ¸] X K 9 9 þ t A

× ¼8 £ x _ p è| ¾ Ó` ¦ ] j % i .

POF 9 þ t A × ¼8 £ x _ : £ ¤& ñ Â Ò0 A\ ¦ ] j l 0 AK Fig. 2\

"

fü < ° ú s l 2 ¤ Y Us $ H 20 W/ å L PWM (Pulse Width Modulation) ~ ½ Ód _ © s 10.6 µm CO

₂

Y Us $ (SYNRAD, USA) Ð / B N l \ " f Ø ¦ ) a 3 mm _ c ` ¦ 2.7 C _ beam expander (CASCADE, USA)\ ¦ : x K c f

â ` ¦ S X @ / r Ê ê Å Ò 5 Å q ¸ 1 kHz_ x, y» ¡ ¤ ] j# Q Û ¼ H

- (CSI, USA) Ð Y Us $ c _ 2 " é ¶& h © @ /& h 0 Au \ ¦ ]

j# Qô Ç Ê ê í& h U ´s 150 mm_ E $ Ý ¼\ ¦ : x K POF_ 9 þ t A

× ¼8 £ x` ¦ d y % i .

Y

Us $ _ ¸ Ø ¦§ 4 \ É r POF 9 þ t A × ¼8 £ x _ d y U · s

ü < ; ¤ É r Fig. 3 x 9 Table 1õ ° ú . Fig. 4 H Fig. 3 õ

° ú

s d y ) a POF \ F g " é ¶` ¦ Å Ò Ù þ ¡` ¦ M : 9 þ t A × ¼8 £ x ] j Â

Òì r \ " f_ 8 £ ¤ µ 1 Ï F g & ³ © ` ¦ F g < Æ z ´^ & ³p â Ü ¼ Ð O É

% ò

ô Ç s p t s . Fig. 4\ " f ^ ¦ Ã º e 1 p w s 10 µm s _

9 þ t A × ¼8 £ x ] j r \ H 8 £ ¤ µ 1 Ï F g s _ s À Ò# Qt t

· ú

§Ü ¼ 9, 10 µm s © ] j r \ H í ß ê ø Í F g \ _ ô Ç ) © s µ

1 ÏÒ q t H כ ` ¦ ^ ¦ Ã º e .

Fig. 3. Marked clad of POF depending on laser intensity;

(a) 0.3 W, (b) 0.6 W, (c) 0.8 W, (d) 1.2 W.

Table 1. Marking depth and width of cladding depending on laser intensity.

Intensity [W] Depth [µm] Width [µm]

0.3 5 70

0.6 10 100

0.8 30 120

1.2 50 150

Fig. 4. Side luminesence of marked POF depending on intensity of recording laser; intensity of recording laser is (a) 0.3 W, (b) 0.6 W, (c) 0.8 W, (d) 1.2 W.

III. + s ÇÊ Ý õ m Í À X Ø8 ý

POF 8 £ ¤ _ 9 þ t A × ¼8 £ x` ¦ / B N < ÊÜ ¼ Ð+ POF # QY Us

\

¦ ½ ¨ & ³ô Ç Ð V , É r & h _ n Û ¼e ¦ Y Us ¸ 0 p x ½ + É

כ

Ü ¼ Ð \ V © ) a . Fig. 5 H f â s 1 mm POF[ þ t` ¦ # Q Y

Us + þ AI Ð C \ P ô Ç כ Ü ¼ Ð / B N Ê ê_ ³ ð _ ¸ ª õ

LED F g " é ¶` ¦ POF \ { 9 % i ` ¦ M :_ µ 1 Ï F g ¸_ þ v` ¦ Ð#

(3)

½ ¨ 7 Hë H 8 £ ¤ µ 1 Ï F g POF \ _ ô Ç LED n Û ¼e ¦ Y Us – þ j É r " f 1 p x -411-

Fig. 5. Achieved uniform illumination on the POF array with showing the detailed image; (a) POF array before laser marking, (b) POF array after laser marking, (c) Side illumination on the surface of the POF array by the LED light source.

Å

Ò ¦ e . POF 8 £ ¤ \ [ jx 9 ô Ç s p t \ ¦ / B N ô Ç כ ` ¦ S X

½ + É Ã º e Ü ¼ 9 LED F g` ¦ { 9 r ( Ü ¼ Ð+ s p t

POF 8 £ ¤ ` ¦ : x K " f " î > z ` ¦ S X ½ + É Ã º e

.

: r õ \ ¦ ½ ÓÜ ¼ Ð Y Us $ / B N ) a POF\ ¦ " f Ð x 9 Ã Ì

÷

&> { 9 § > = Ð & ñ § > = ) a ó ø Í © Ü ¼ Ð + þ A$ í r v é ß s " é ¶ + þ

AÜ ¼ Ð + þ A$ í ) a ª 4 S qo 1 p x ª ô Ç s p t ½ ¨ & ³` ¦ l @ /

½

+ É Ã º e . Fig. 6 x 9 Fig. 7 É r f â 1 mm_ POF\ ¦ 30 > h m

12 µ 1 Ï` ¦ ë ß [ þ t # Q" f ^ # QY Us é ß \ Y Us $ \ _ K

8 £ ¤ d y ) a POF\ ¦ Ð# Å Ò 9, d y ) a POF # QY Us \

"

f LED F g " é ¶ \ _ ô Ç 8 £ ¤ µ 1 Ï F g` ¦ y Ò o¾ ú _ LED F g " é ¶

\

_ # s p t ½ ¨ & ³H d` ¦ Ð# Å Ò ¦ e .

Y

Us $ / B N ¸| ` ¦ Ð þ j& h o ¦ d y _ U ·s x 9

¸ ª 1 p x d y ¸| ` ¦ Ð & ñ x 9 > ¸] X ô Ç ^ & h Ü

IV. + s Ç Â ] Ø

: r ½ ¨\ " f H { 9 § > = Ð & ñ § > = ) a Ã º_ POF\ p o [ O

>

ô Ç s p t \ ¦ Y Us $ ( ç Z O \ _ ô Ç 9 þ t A × ¼8 £ x _ d y

`

¦ : x K 8 £ ¤ µ 1 Ï F g` ¦ Ä » ¸K Í Ç x . s Qô Ç POF_ 8 £ ¤ µ

ô Ç 6 f ¸_ µ 1 Ï F g x 9 F g " é ¶ _ Ò o¾ ú \ É r ª ô Ç º ú \ ¦

LED n Û ¼e ¦ Y Us _ ½ ¨ & ³s ½ + É Ã º e . ¢ ¸ô Ç, Y U s

$ ( ç Z O ` ¦ : x K q ] X 8 ú ¤d Ü ¼ Ð / B N < ÊÜ ¼ Ð+ ç H{ 9 ô Ç

s p t \ ¦ Ð " î > ½ ¨ & ³½ + É Ã º e Ü ¼ 9, Y Us $ /

B

N ; ¤ x 9 U ·s \ Ø ¦ ÷ & H y n C` ¦ ¸] X ½ + É Ã º e % 3

. " f / B N ) a POF\ ¦ " f Ð x 9 Ã Ì÷ &> { 9 § > = Ð & ñ § > =r

&

+ þ AI _ s p t é ß s " é ¶+ þ AÜ ¼ Ð + þ A$ í ) a ª 4 S qo

1 p x ª ô Ç s p t ½ ¨ & ³` ¦ l @ /½ + É Ã º e .

Fig. 6. POF array (30ea times 12bumdles); (a) POF array after laser, (b) Side illumination on the surface of the POF array by the LED light source.

Fig. 7. Side illumination on the surface of the POF ar- ray ; (a) Achieved images by blue LED light source, (b) Achieved images by white LED light source, (c) Achieved images by red LED light source, (d) Achieved images by blue, white, and red LED light source.

Y

c p w Ã U Ø ô

[1] P. J. Jaquet, in the Proceedings of the 1991 Plastic Optical Fiber Meeting of the SPIE edited by M. Ki- tazawa (Boston, MA, 1991), p. 165.

[2] J. Lawrence and L. Li, Material Science and Engi- neering, A303, 142 (2001).

[3] Y. J. Shin, H. J. Kim, Y. S. Kim, S. H. Park, W. G.

Jung, Z. Chen and J. S. Nelson, J. Korean Phys. Soc.

48, L184 (2006).

[4] Y. J. Shin, Y. S. Kim, S. H. Park, B. J. Jung, J. W.

Lee and J. S. Nelson, J. Laser Applications, 17, 243 (2005).

[5] Y. S. Kim, S. H. Park, T. H. Kim and Y. J. Shin,

SAEMULLI (New Phys.) 52, 169 (2006).

(4)

-412- ô Ç² D GÓ ü t o < Æ rt “D hÓ ü t o ”, Volume 54, Number 5, 2007¸ 5 Z 4

LED Display by Side Luminescence of a Plastic Optical Fiber

E. S. Choi, Y. S. Kim, S. H. Park and Y. J. Shin

^∗

Laser Imaging Laboratory, Chosun University, Gwangju 501-759

(Received 1 March 2007)

We have manufactured a display unit using the side luminescence of a plastic optical fiber (POF), fabricated by a laser marking technique. To control the emitted light from the laser engraved side of the fiber, used for the light-emitting-diode (LED) display, we prepared fiber array and then make grooves in the clad layer of the fiber by adjusting the laser marking conditions. We achieved the uniform illumination on the surface of the array and obtain a detailed image on the display unit.

PACS numbers: 42.30.Va

Keywords: LED display, Side luminescence, Laser engraving, POF

∗

E-mail: [email protected]

 ½ ¨ 7 Hë H Sae Mulli (The Korean Physical Society), Volume 54, Number 5, 2007¸ 5 Z 4, pp. 409∼412

   ½ ¨ 7 Hë  H  Sae Mulli (The Korean Physical Society), Volume 54, Number 5, 2007¸  5 Z 4, pp. 409∼412



¤ì Å ®  o° Ë Ñ POF; c 8 ý X ¢ LED O ­ þ u §7 _T 

L

|ª <" k ·  »* å ) כ ·    Ðr ) · , > ÷ 7 B . > ∗



¸  @ / < Æ §    õ  < Æ@ / < Æ, Laser Imaging Laboratory, F g Å Ò 501-759 (2007¸  3 Z 4 1{ 9  ~ Ã Î6 £ §)

POF (Plastic Optical Fiber) _  9 þ t A × ¼8 £ x`  ¦ CO

Y Us $  Ð d  y   #  8 £ ¤  µ 1 Ï F g`  ¦ :  x ô  Ç n Û ¼e  ¦ Y Us 



¸" î r Û ¼% 7 `  ¦ > hµ 1 Ï % i  . POF_  Y Us $  d  y  ô  Ç Â Òì  r \ " f F g _  ~ ½ ÓØ  ¦`  ¦ ] j# Q l  0 A # , POF\  ¦ " f



Ð x 9  Ã Ì÷ &>  { 9 § > = Ð & ñ § > = #  # QY Us \  ¦ ï  r q ô  Ç Ê ê Y Us $  ( ç Z O `  ¦ :  x K  q ] X 8 ú ¤d  Ü ¼ Ð POF_  9 þ t A 

×

¼8 £ x \  / å J À ÒÚ Ô\  ¦ + þ A$ í #  s p t \  ¦ ë ß [ þ t% 3  .   " f Y Us $  / B N   ;  ¤ x 9 U ·s \     [ O >   ) a s  p

t  Õ ª@ / Ð POF_   ï# Q8 £ x Ü ¼ Ð { 9    ) a LED F g s  # QA s _  ³ ð  \ " f ç  H{ 9   ¦ [ jx 9  >  8 £ ¤  µ 1 Ï F g

  H n Û ¼e  ¦ Y Us \  ¦ r   ½ + É Ã º e  % 3  .

PACS numbers: 42.30.Va

Keywords: n Û ¼e  ¦ Y Us , 8 £ ¤  µ 1 Ï F g, Y Us $  / B N, e  ¦ Û ¼h Ë :F g$ 3 Ä »

I. " e Â ] Ø

e

 ¦ Û ¼h Ë : F g$ 3 Ä » (POF)  H POF  ^ \  ç ß é ß ô  Ç  ¸  `  ¦ :



x K " f F g _  { 9 Â Ò\  ¦   × þ & h Ü ¼ Ð ü @Â Ò Ð   Ø  ¦ ½ + É Ã º e    [1]. s  Qô  Ç  © & h `  ¦ s 6 x #  é ß í  H ô  Ç  â  ' a  ¸" î s ü @\  ³ ð r

 © u  ¢ ¸  H Ñ þ  s h A  © u \  ¦  í < Ê   H  ¸" î  © u \  ¦ ½ ¨

$ í

  H   ½ ¨  Ö ¸ µ 1 Ï  . s  Qô  Ç POF\  ¦ s 6 x ô  Ç  ¸" î  ©  u

  H POF _  9 þ t A × ¼8 £ x \  Û ¼ß ¼A u \  ¦ Å Ò    ¸½ ¨ 1 p x`  ¦ s

6 x #    0 A& h Ü ¼ Ð < Ì ¢ ¸  H   `  ¦ + þ A$ í   H 1 p x : £ ¤& ñ  ¸



ª `  ¦ D h " f F g _   < Hz ´`  ¦ Ä » ¸   H  כ s  . t ë ß  & ñ x 9  ô

 Ç / B N/ B N& ñ _  ] j# Q \ O s   H POF U ´s  ~ ½ Ó ¾ Ó\       Ø

 ¦ ÷ &  H F g _  6 f ¸ Ô  ¦ç  H{ 9   . ¢ ¸ô  Ç 9 þ t A × ¼8 £ x _  e  _ 

&

h    < H  © s l  M :ë  H \  Ø  ¦§ 4 F g s  & h & h  # Q¿ º# Qt    & h 

&

h  µ 1 ß t   H 1 p x Ô  ¦ ½ ©g Ë :& h   8 £ ¤  µ 1 Ï F g Ü ¼ Ð   K  ´ òõ & h



 n Û ¼e  ¦ Y Us  % i ½ + É`  ¦ ½ ¨ & ³½ + É Ã º \ O `  ¦ ÷  r ë ß   m   " é ¶ 



 H s p t \  ¦ & ñ S X   ¦ [ jx 9  >   è ­ q Ã º \ O   H ë  H ] j& h 

`

 ¦ t >   ) a . { 9 Â Ò   ½ ¨\ " f  H  ¦· ú Ü ¼ Ð   ] j\  ¦ ì  r



 #  9 þ t A × ¼8 £ x`  ¦    ? /  H ~ ½ ÓZ O Ü ¼ Ð ì  r     H   ] j _

 ß ¼l  x 9 · ú § 4 _  \     9 þ t A × ¼8 £ x`  ¦ d  y    ¦ e  Ü ¼

 ç  H{ 9 ô  Ç / B N s  Ô  ¦ 0 p x  9, Û ¼ß ¼\  ¦ s 6 x ô  Ç ~ ½ ÓZ O  É r

/ B N  \  p o  Û ¼ß ¼\  ¦ ] j   #    < ÊÜ ¼ Ð+  q 6 x 1 p x _

 7 £ x \  ¦ 4 R`  ¦ ÷  r ë ß   m   { 9 ì ø Í& h Ü ¼ Ð POF_  t 2 £ § s

 1 mm ? /ü @s Ù ¼ Ð Û ¼ß ¼_  » 1 ÏÂ Ò Ã Ìs   & ³z ´& h Ü ¼ Ð Ô  ¦

0 p x  9   ^ & h     \ O ´ òÖ  ¦ _  $  \  ¦ 4 R ¸  H é ß & h s  e 

 .

E-mail: [email protected]



: r   ½ ¨\ " f  H s  Qô  Ç ë  H ] j& h `  ¦ K     ¦  CO

Y U s

$ ü < POF 8 £ ¤  _  d  y    ¸| \  @ /ô  Ç ] j# Q 0 p x ô  Ç á Ô



ÐÕ ªÏ þ `  ¦ s 6 x #  & ñ x 9 ô  Ç / B N`  ¦ Ã º'   % i   [2–5]. s 



Qô  Ç r Û ¼% 7 `  ¦  Ö ¸6 x #  POF\ " f 9 þ t A × ¼8 £ x _  : £ ¤& ñ Â Ò0 A ë

ß `  ¦  Ð  & ñ x 9  >  / B N  < ÊÜ ¼ Ð+   ¾ Ó ©   ) a ç  H{ 9 ô  Ç 6 f ¸

\

 ¦ ° ú   H µ 1 Ï F g ^ \  ¦ ½ ¨ & ³½ + É Ã º e  % 3 Ü ¼ 9, POF 8 £ ¤  / B N õ

& ñ \ " f d  y   U ·s \  ¦ " é ¶ Ö ¸ y   ¸] X  #  POF U ´s ~ ½ Ó ¾ Ó Ü

¼ Ð F g   Ø  ¦ _  ì  r  í\  ¦  ¸] X  ½ + É Ã º e   .   " f  : r  

½

¨_  3 l q& h  É r " é ¶   H s p t \  ¦ " é ¶   H ß ¼l  x 9 + þ A © Ü ¼ Ð [ O

> ô  Ç Ê ê [ O >   ) a s p t \  ¦ Y Us $  / B N #  POF_  9 þ t A

× ¼8 £ x`  ¦ ] j r (  Ü ¼ Ð+  µ 1 Ï F g r  ç  H{ 9 ô  Ç 6 f ¸ Ð µ 1 Ï F g ÷ &

#

Q f  õ   Ö  ¦  Q é ß í  H ô  Ç F g _  Ø  ¦§ 4 s     [ O >   ) a s p t  Õ

ª@ / Ð n Û ¼e  ¦ Y Us  ½ + É Ã º e  Ü ¼ 9, " é ¶   H LED Ò  o © Ü ¼ Ð F

g`  ¦ { 9  r &  1 l x o © _  ½ ¨ & ³`  ¦ 0 p x >    H 8 £ ¤  µ 1 Ï F

g+ þ A e  ¦ Û ¼h Ë : F g$ 3 Ä »\  ¦ s 6 x ô  Ç  ¸" î x 9 n Û ¼e  ¦ Y Us  r  Û

¼% 7 `  ¦ ½ ¨ & ³   H  כ s  .

II. ÷ m Ç ] M ö



Ò  ¦  Ð    10 µm ¿ ºa _  : £ ¤$ í `  ¦ t  ¦ e   . s ü < ° ú  É r r

½ ¨ 7 Hë H Sae Mulli (The Korean Physical Society), Volume 54, Number 5, 2007¸ 5 Z 4, pp. 409∼412

½ ¨ 7 Hë H Sae Mulli (The Korean Physical Society), Volume 54, Number 5, 2007¸ 5 Z 4, pp. 409∼412

¤ì Å ® o° Ë Ñ POF; c 8 ý X ¢ LED O þ u §7 _T

|ª <" k · »* å ) כ · Ðr ) · , > ÷ 7 B . > ^∗

¸ @ / < Æ § õ < Æ@ / < Æ, Laser Imaging Laboratory, F g Å Ò 501-759 (2007¸ 3 Z 4 1{ 9 ~ Ã Î6 £ §)

POF (Plastic Optical Fiber) _ 9 þ t A × ¼8 £ x` ¦ CO

Y Us $ Ð d y # 8 £ ¤ µ 1 Ï F g` ¦ : x ô Ç n Û ¼e ¦ Y Us

¸" î r Û ¼% 7 ` ¦ > hµ 1 Ï % i . POF_ Y Us $ d y ô Ç Â Òì r \ " f F g _ ~ ½ ÓØ ¦` ¦ ] j# Q l 0 A # , POF\ ¦ " f

Ð x 9 Ã Ì÷ &> { 9 § > = Ð & ñ § > = # # QY Us \ ¦ ï r q ô Ç Ê ê Y Us $ ( ç Z O ` ¦ : x K q ] X 8 ú ¤d Ü ¼ Ð POF_ 9 þ t A

¼8 £ x \ / å J À ÒÚ Ô\ ¦ + þ A$ í # s p t \ ¦ ë ß [ þ t% 3 . " f Y Us $ / B N ; ¤ x 9 U ·s \ [ O > ) a s p

t Õ ª@ / Ð POF_ ï# Q8 £ x Ü ¼ Ð { 9 ) a LED F g s # QA s _ ³ ð \ " f ç H{ 9 ¦ [ jx 9 > 8 £ ¤ µ 1 Ï F g

H n Û ¼e ¦ Y Us \ ¦ r ½ + É Ã º e % 3 .

Keywords: n Û ¼e ¦ Y Us , 8 £ ¤ µ 1 Ï F g, Y Us $ / B N, e ¦ Û ¼h Ë :F g$ 3 Ä »

¦ Û ¼h Ë : F g$ 3 Ä » (POF) H POF ^ \ ç ß é ß ô Ç ¸ ` ¦ :

x K " f F g _ { 9 Â Ò\ ¦ × þ & h Ü ¼ Ð ü @Â Ò Ð Ø ¦ ½ + É Ã º e [1]. s Qô Ç © & h ` ¦ s 6 x # é ß í H ô Ç â ' a ¸" î s ü @\ ³ ð r

© u ¢ ¸ H Ñ þ s h A © u \ ¦ í < Ê H ¸" î © u \ ¦ ½ ¨

H ½ ¨ Ö ¸ µ 1 Ï . s Qô Ç POF\ ¦ s 6 x ô Ç ¸" î © u

H POF _ 9 þ t A × ¼8 £ x \ Û ¼ß ¼A u \ ¦ Å Ò ¸½ ¨ 1 p x` ¦ s

6 x # 0 A& h Ü ¼ Ð < Ì ¢ ¸ H ` ¦ + þ A$ í H 1 p x : £ ¤& ñ ¸

ª ` ¦ D h " f F g _ < Hz ´` ¦ Ä » ¸ H כ s . t ë ß & ñ x 9 ô

Ç / B N/ B N& ñ _ ] j# Q \ O s H POF U ´s ~ ½ Ó ¾ Ó\ Ø

¦ ÷ & H F g _ 6 f ¸ Ô ¦ç H{ 9 . ¢ ¸ô Ç 9 þ t A × ¼8 £ x _ e _

h < H © s l M :ë H \ Ø ¦§ 4 F g s & h & h # Q¿ º# Qt & h

h µ 1 ß t H 1 p x Ô ¦ ½ ©g Ë :& h 8 £ ¤ µ 1 Ï F g Ü ¼ Ð K ´ òõ & h

n Û ¼e ¦ Y Us % i ½ + É` ¦ ½ ¨ & ³½ + É Ã º \ O ` ¦ ÷ r ë ß m " é ¶

H s p t \ ¦ & ñ S X ¦ [ jx 9 > è q Ã º \ O H ë H ] j& h

¦ t > ) a . { 9 Â Ò ½ ¨\ " f H ¦· ú Ü ¼ Ð ] j\ ¦ ì r

# 9 þ t A × ¼8 £ x` ¦ ? / H ~ ½ ÓZ O Ü ¼ Ð ì r H ] j _

ß ¼l x 9 · ú § 4 _ \ 9 þ t A × ¼8 £ x` ¦ d y ¦ e Ü ¼

ç H{ 9 ô Ç / B N s Ô ¦ 0 p x 9, Û ¼ß ¼\ ¦ s 6 x ô Ç ~ ½ ÓZ O É r

/ B N \ p o Û ¼ß ¼\ ¦ ] j # < ÊÜ ¼ Ð+ q 6 x 1 p x _

7 £ x \ ¦ 4 R` ¦ ÷ r ë ß m { 9 ì ø Í& h Ü ¼ Ð POF_ t 2 £ § s

1 mm ? /ü @s Ù ¼ Ð Û ¼ß ¼_ » 1 ÏÂ Ò Ã Ìs & ³z ´& h Ü ¼ Ð Ô ¦

0 p x 9 ^ & h \ O ´ òÖ ¦ _ $ \ ¦ 4 R ¸ H é ß & h s e

.

: r ½ ¨\ " f H s Qô Ç ë H ] j& h ` ¦ K ¦ CO

$ ü < POF 8 £ ¤ _ d y ¸| \ @ /ô Ç ] j# Q 0 p x ô Ç á Ô

ÐÕ ªÏ þ ` ¦ s 6 x # & ñ x 9 ô Ç / B N` ¦ Ã º' % i [2–5]. s

Qô Ç r Û ¼% 7 ` ¦ Ö ¸6 x # POF\ " f 9 þ t A × ¼8 £ x _ : £ ¤& ñ Â Ò0 A ë

ß ` ¦ Ð & ñ x 9 > / B N < ÊÜ ¼ Ð+ ¾ Ó © ) a ç H{ 9 ô Ç 6 f ¸

¦ ° ú H µ 1 Ï F g ^ \ ¦ ½ ¨ & ³½ + É Ã º e % 3 Ü ¼ 9, POF 8 £ ¤ / B N õ

& ñ \ " f d y U ·s \ ¦ " é ¶ Ö ¸ y ¸] X # POF U ´s ~ ½ Ó ¾ Ó Ü

¼ Ð F g Ø ¦ _ ì r í\ ¦ ¸] X ½ + É Ã º e . " f : r

¨_ 3 l q& h É r " é ¶ H s p t \ ¦ " é ¶ H ß ¼l x 9 + þ A © Ü ¼ Ð [ O

> ô Ç Ê ê [ O > ) a s p t \ ¦ Y Us $ / B N # POF_ 9 þ t A

× ¼8 £ x` ¦ ] j r ( Ü ¼ Ð+ µ 1 Ï F g r ç H{ 9 ô Ç 6 f ¸ Ð µ 1 Ï F g ÷ &

Q f õ Ö ¦ Q é ß í H ô Ç F g _ Ø ¦§ 4 s [ O > ) a s p t Õ

ª@ / Ð n Û ¼e ¦ Y Us ½ + É Ã º e Ü ¼ 9, " é ¶ H LED Ò o © Ü ¼ Ð F

g` ¦ { 9 r & 1 l x o © _ ½ ¨ & ³` ¦ 0 p x > H 8 £ ¤ µ 1 Ï F

g+ þ A e ¦ Û ¼h Ë : F g$ 3 Ä »\ ¦ s 6 x ô Ç ¸" î x 9 n Û ¼e ¦ Y Us r Û

¼% 7 ` ¦ ½ ¨ & ³ H כ s .

Ò ¦ Ð 10 µm ¿ ºa _ : £ ¤$ í ` ¦ t ¦ e . s ü < ° ú É r r

« Ñ\ " f 8 £ ¤ Ü ¼ Ð_ F g Ø ¦` ¦ Ä » ¸ l 0 AK á Ô ÐÕ ªÏ þ

-410- ô Ç² D GÓ ü t o < Æ rt “D hÓ ü t o ”, Volume 54, Number 5, 2007¸ 5 Z 4

_ K p o n ) a s p t \ ¦ U ·s 5 ∼ 50 µm, ; ¤ 70

∼ 150 µm Ð l 2 ¤ Y Us $ _ ¸ Ø ¦§ 4 ` ¦ ¸] X K 9 9 þ t A

× ¼8 £ x _ p è| ¾ Ó` ¦ ] j % i .

POF 9 þ t A × ¼8 £ x _ : £ ¤& ñ Â Ò0 A\ ¦ ] j l 0 AK Fig. 2\

fü < ° ú s l 2 ¤ Y Us $ H 20 W/ å L PWM (Pulse Width Modulation) ~ ½ Ód _ © s 10.6 µm CO

Y Us $ (SYNRAD, USA) Ð / B N l \ " f Ø ¦ ) a 3 mm _ c ` ¦ 2.7 C _ beam expander (CASCADE, USA)\ ¦ : x K c f

â ` ¦ S X @ / r Ê ê Å Ò 5 Å q ¸ 1 kHz_ x, y» ¡ ¤ ] j# Q Û ¼ H

- (CSI, USA) Ð Y Us $ c _ 2 " é ¶& h © @ /& h 0 Au \ ¦ ]

j# Qô Ç Ê ê í& h U ´s 150 mm_ E $ Ý ¼\ ¦ : x K POF_ 9 þ t A

× ¼8 £ x` ¦ d y % i .

Us $ _ ¸ Ø ¦§ 4 \ É r POF 9 þ t A × ¼8 £ x _ d y U · s

ü < ; ¤ É r Fig. 3 x 9 Table 1õ ° ú . Fig. 4 H Fig. 3 õ

s d y ) a POF \ F g " é ¶` ¦ Å Ò Ù þ ¡` ¦ M : 9 þ t A × ¼8 £ x ] j Â

Òì r \ " f_ 8 £ ¤ µ 1 Ï F g & ³ © ` ¦ F g < Æ z ´^ & ³p â Ü ¼ Ð O É

ô Ç s p t s . Fig. 4\ " f ^ ¦ Ã º e 1 p w s 10 µm s _

9 þ t A × ¼8 £ x ] j r \ H 8 £ ¤ µ 1 Ï F g s _ s À Ò# Qt t

§Ü ¼ 9, 10 µm s © ] j r \ H í ß ê ø Í F g \ _ ô Ç ) © s µ

1 ÏÒ q t H כ ` ¦ ^ ¦ Ã º e .

POF 8 £ ¤ _ 9 þ t A × ¼8 £ x` ¦ / B N < ÊÜ ¼ Ð+ POF # QY Us

¦ ½ ¨ & ³ô Ç Ð V , É r & h _ n Û ¼e ¦ Y Us ¸ 0 p x ½ + É

כ

Ü ¼ Ð \ V © ) a . Fig. 5 H f â s 1 mm POF[ þ t` ¦ # Q Y

Us + þ AI Ð C \ P ô Ç כ Ü ¼ Ð / B N Ê ê_ ³ ð _ ¸ ª õ

LED F g " é ¶` ¦ POF \ { 9 % i ` ¦ M :_ µ 1 Ï F g ¸_ þ v` ¦ Ð#

½ ¨ 7 Hë H 8 £ ¤ µ 1 Ï F g POF \ _ ô Ç LED n Û ¼e ¦ Y Us – þ j É r " f 1 p x -411-

Ò ¦ e . POF 8 £ ¤ \ [ jx 9 ô Ç s p t \ ¦ / B N ô Ç כ ` ¦ S X