10.6um F-theta Lens

  • Update:Apr 19, 2020
  • View:

F-theta lenses are used in laser scanners (laser markers) and the laser wavelengths may be 355/266/532/1064nm, 10.6um and other wavelengths. We can provide full range of f-theta lenses.

We are promoting laser lamps, galvos, marking heads, green laser pointers etc till the stock is sold out. Pleasee click here.

A standard lens focuses the laser beam on a spherical plain in contrast to an ideal flat or plane field. The use of ƒ-theta lenses provides a plane focusing surface and almost constant spot size over the entire XY image plane or scan field. The position of the spot on the image plane is directly proportional to the scan angle. Telecentric ƒ-theta lenses focus the laser beam so it is almost perpendicular (within 1 degree) to the work surface over the entire scan field. This ensures the spot is round even in the corners of the scan field and if holes or channels are machined, they are perpendicular to the work surface.

Color corrected ƒ-theta lenses are designed to accommodate multiple wavelengths. Normally each wavelength would focus to a different point on the work surface. In a color corrected lens the focal point for each wavelength coincide. This is achieved by scheduling an ideal combination of different glass types for the various lens elements in the lens. Color corrected ƒ-theta lens are primarily used for simultaneously viewing the work surface through the scan lens with a camera while laser processing. Another common application for color corrected scan lenses are for use in confocal scan microscopes which require a broad range of visible wavelengths.

We mainly provide 3 series of f-theta lenses, STY, STS and STJ.

In the following tables, the abbreviations are as follows: FL means effective focal length; EP means max. input beam diameter; SAR means scan area, AS means aperture stop; WD means working distance; OD means max. outside diameter; MT means mount thread; fs means fused silica, SA means max. full diagonal scan angle; L2 (a1) means recommended mirror separation; a2 means 2nd mirror to flange; L1 means the distance 2nd mirror and scan lens; SL means scan length; Length means the total length of the scan lens; FSD means focused spot diameter.

1.     Single-element Scan Lenses (F-theta Lenses)

1) STSL Series F-theta Lenses

STSL scanner lenses specially designed and optimized for use in CO2 laser 2-axis galvo-scanner systems with full beam diameters of up to 15.0mm.  Mirror sets appropriate for use with beam diameters up to 15mm require an increase in mirror separation in comparison with smaller mirrors. These changed optical conditions are catered for by the STSL series. These single-element lenses are designed to represent the best achievable compromise for on-axis and off-axis aberrations, field flatness and F-theta characteristics, obtainable using single-element spherical-surface designs of (standard) 48mm diameter. The lens materials is ZnSe.

Part no.

Focal length (mm)

Scan field (mm)

Back focal length (mm)

Flange focal length (mm)

Average spot diameter (mm)

STSL-10.6-50-75

75.2

50 x 50

74.2

78.4

171

STSL-10.6-60-90

90.1

60 x 60

90.0

94.8

174

STSL-10.6-70-101

101.3

70 x 70

101.4

106.1

181

STSL-10.6-105-149

149.1

105 x 105

150.6

155.6

219

STSL-10.6-120-175

175.0

120 x 120

177.4

178.4

243

STSL-10.6-125-179

179.2

125 x 125

181.9

187.3

247

STSL-10.6-140-201

200.6

140 x 140

203.5

208.8

269

STSL-10.6-155-226

225.5

155 x 155

228.0

232.8

296

STSL-10.6-175-249

249.4

175 x 175

253.3

258.5

320

STSL-10.6-210-298

298.0

210 x 210

302.6

307.7

373

STSL-10.6-250-363

362.6

250 x 250

368.2

373.2

445

STSL-10.6-280-394

394.4

280 x 280

401.4

406.7

481

STSL-10.6-300-433

432.7

300 x 300

441.0

446.2

525

STSL-10.6-340-482

481.8

340 x 340

490.2

495.3

581

STSL-10.6-370-529

528.8

370 x 370

538.5

543.5

634

STSL-10.6-415-592

591.7

415 x 415

586.5

589.9

717

STSL-10.6-500-717

716.5

500 x 500

730.0

734.7

850

STSL-10.6-550-782

781.6

550 x 550

797.7

802.2

925

STSL-10.6-600-848

848.4

600 x 600

859.6

863.7

1000

STSL-10.6-680-978

977.6

680 x 680

993.7

997.9

1150

STSL-10.6-840-1183

1183

840 x 840

1205

1208

1390

STSL-10.6-850-1201

1201

850 x 850

1216

1220

1410

STSL-10.6-920-1285

1285

920 x 920

1317

1321

1520

STSL-10.6-1000-1409

1409

1000 x 1000

1421

1425

1650

STSL-10.6-1120-1577

1577

1120 x 1120

1593

1596

1840

STSL-10.6-1256-1746

1746

1256 x 1256

1783

1787

2040

STSL-10.6-1500-2122

2122

1500 x 1500

2173

2177

2420

For the above lenses, we can provide a mount as option as follows:

2) STXH Series  Mounted F-theta Lenses

Part No.

SAR(mm)

FSD(mm)

FL(mm)

WD(mm)

L1(mm)

Telecentricity(o)

STXH-10.6-50-75

50×50

0.12

75

57.5

15.5

16.1

STXH-10.6-70-100

70×70

0.18

101.3

85.7

14.4

19

STXH-10.6-90-125

90x90

0.22

128.3

111.9

13.3

21.8

STXH-10.6-110-150

110×110

0.29

150.2

135.9

13.3

23.5

STXH-10.6-140-230

140×140

0.50

238.1

227

12.8

23.6

STXH-10.6-175-250

175×175

0.54

250

238

14.0

23.9

STXH-10.6-210-300

210×210

0.61

300

288

13.8

24.5

STXH-10.6-250-360

250×250

0.80

360

352.8

12.4

26.7

STXH-10.6-300-430

300×300

1.00

430

356.5

13.8

27.8

Remark: For all STXH lenses, the lens diameter is 48.0 +0/-0.1 mm, allowed maximum input beam diameter is 14mm (20mm is available upon request), scan mirror spacing L2 is 16.5mm, outside diameter is 91mm, total length is 24mm, mount thread is M85x1mm and the lens materials is ZnSe. For the lens diameters, 38mm and 65mm are available upon request.

3) STY Series 10.6um Mounted F-theta Lenses

Model

FL

mm

WD

mm

EP

mm

SA

max

SAR, mm (round/square)

FSD

µm

ODxL

mm

MT

STY-10.6-70-100

100

85.5

10

±25º

Φ100/70x70

193.98

90x26.5

M85x1

STY-10.6-110-150

150

131.5

12

±25º

Φ155/110x110

242.47

90.2x26.5

M85x1

STY-10.6-140-200

200

185.7

15

±25º

Φ198/140x140

258.64

90.2x26.5

M85x1

STY-10.6-175-250

250

244.8

15

±25º

Φ248/175x175

323.3

90x26

M85x1

STY-10.6-210-300

300

298.8

12

±25º

Φ297/210x210

484.95

90x26

M85x1

STY-10.6-250-360

360

350

12

±25º

Φ495/250x250

581.94

90x26

M85x1

STY-10.6-300-430

430

420.2

15

±25º

Φ424/300x300

558.08

90x26

M85x1

STY-10.6-350-500

500

552.52

20

±28.4’’

Φ494/350x350

48.67

120x32.5

M85x1

STY-10.6-400-580

580

663.8

20

±25º

Φ580/400x400

562.54

120x47

M85x1

4) STH Series 10.6um Mounted F-theta Lenses

Model

FL, mm

SAR, mm

FSD, mm

MT

STH-10.6-50-63

63

50x50

0.2

M85x1

STH-10.6-70-100

100

70x70

0.2

M85x1

STH-10.6-110-160

160

110x110

0.2

M85x1

STH-10.6-140-230

230

140x140

0.2

M85x1

STH-10.6-175-254

254

175x175

0.2

M85x1

STH-10.6-210-300

300

210x210

0.2

M85x1

STH-10.6-250-360

360

250x250

0.25

M85x1

STH-10.6-300-450

450

300x300

0.35

M85x1

STH-10.6-400-592

592

400x400

0.2

M85x1

STH-10.6-600-650

650

600x600

0.7

M85x1

5) STL Series Mounted Single-element F-theta Lenses

Part No.

FL, mm

SAR, mm

EP, mm

SA, ±°

FSD, µm

Lens Dia. mm

DxL, mm

STL-10.6-35-52-48

52

35X35

10

28

128

48

89x25

STL-10.6-50-75-48

75

50X50

10

28

181

48

89x25

STL-10.6-70-100-48

100

70x70

12

28

185

48

89x25

STL-10.6-75-120-48

120

75x75

10

28

190

48

89x25

STL-10.6-90-130-48

130

90x90

10

28

200

48

89x25

STL-10.6-110-150-48

150

110X110

12

28

280

48

89x25

STL-10.6-140-200-48

200

140X140

15

28

338

48

89x25

STL-10.6-175-250-48

250

175X175

15

28

357

48

89x25

STL-10.6-210-300-48

300

210X210

12

28

565

48

89x25

STL-10.6-250-359-48

359

250X250

12

28

478

48

89x25

STL-10.6-300-433-48

433

300X300

12

28

640

48

89x25

STL-10.6-320-450-48

450

320X320

12

28

687

48

89x25

STL-10.6-350-480-48

480

350X350

12

28

780

48

89x25

STL-10.6-400-573-48

573

400X400

12

28

979

48

89x25

STL-10.6-500-720-48

720

500X500

14

28

1267

48

89x25

STL-10.6-530-720-48

720

530X530

12

28

1267

48

89x25

STL-10.6-680-934-48

934

680X680

12

28

1630

48

89x25

STL-10.6-750-1191-48

1191

750X750

12

28

2018

48

89x25

STL-10.6-1380-2128-48

2128

1380X1380

12

28

3650

48

89x25

STL-10.6-140-200-70

200

140X140

16

28

171

70

89x25

STL-10.6-175-250-65

250

175X175

20

28

324

65

89x25

STL-10.6-300-430-65

430

300X300

20

28

450

65

89x25

STL-10.6-300-430-70

430

300X300

20

28

442

70

89x25

STL-10.6-320-448-68

448

320X320

20

28

450

68

89x25

STL-10.6-350-480-70

480

350X350

20

28

540

70

89x25

STL-10.6-365-573-62

573

365X365

20

25

677

62

89x25

STL-10.6-400-573-70

573

400X400

20

28

650

70

89x25

STL-10.6-450-620-70

620

450X450

20

28

540

70

89x25

STL-10.6-500-720-75

720

500X500

20

28

830

75

89x25

STL-10.6-540-742-88

742

540X540

20

28

800

88

89x25

STL-10.6-600-830-75

830

600X600

20

28

856

75

89x25

STL-10.6-700-1100-75

1100

700X700

25

25

1006

75

89x25

2. Mounted 2-element F-theta Lenses

1) STU2 Series Mounted 2-element F-theta Lenses

These doublet (STU2) and triplet scanning (STU3) lenses are intended to work with the same configuration of scanning mirrors and beam sizes as the STSL single-element lenses, but are offered at the shorter focal lengths where better performance is possible. The doublets have focal lengths from 75 to 300mm. Above 300mm the benefits of using a doublet are not great. The triplets are offered in two focal lengths, 75 and 100mm. These give diffraction limited performance and even further improvement over the corresponding doublet.

All the lenses are made from laser grade ZnSe. Each of the lenses comes in a black anodized aluminium mount and can also be fitted with a ZnSe protection window as an option.

Specifications:

Part no

Scan field (mm sq)

FL (mm)

Focus size (mm)

Standard deviation of spot (mm)

WD with window (mm)

STU2-10.6-50-75

50

75.0

118

25

62.03

STU2-10.6-70-100

70

100.0

139

22

89.34

STU2-10.6-105-151

105

151.4

171

0

150.84

STU2-10.6-140-200

140ed

200.0

225

0

215.73

STU2-10.6-175-250

175

250.0

282

0

263.17

STU2-10.6-210-300

210

300.0

338

0

313.87

2) STL Series Mounted 2-element F-theta Lenses

Part No.

FL, mm

SAR, mm

EP, mm

SA, ±°

FSD, um

WD, mm

OD*L, mm

MT, mm

STL-10.6-70-100

100

70X70

14

28

116-165

105.6

Φ89x42

M85x1

STL-10.6-105-150

150

105X105

14

28

171.3-172

161.7

Φ89x42

M85x1

STL-10.6-140-200

200

140x140

14

28

188-199

229.4

Φ89x42

M85x1

STL-10.6-175-250

250

175x175

14

28

250-255

286

Φ89x42

M85x1

STL-10.6-210-300

300

210x210

20

28

250-270

327.8

Φ89x42

M85x1

STL-10.6-250-360

360

250X250

14

28

370-389

393

Φ89x42

M85x1

STL-10.6-300-420

420

300x300

16

20

408-427

466

Φ89x42

M85x1

STL-10.6-350-490

490

350x350

18

28

410-434

535

Φ89x42

M85x1

STL-10.6-400-560

560

400x400

30

25

375-385

604.8

Φ89x42

M85x1

STL-10.6-500-700

700

500x500

30

27.8

230-260

763.7

Φ89x42

M85x1

STL-9.4-50-100

100

50X50

20

20

84-88

131.3

Φ89x42

M85x1

STL-9.4-70-100

100

70x70

14

28

116-165

105.6

Φ89x42

M85x1

STL-9.4-140-200

200

140x140

15

28

163-167

219

Φ89x42

M85x1

STL-9.4-170-300

300

170x170

20

23

265-275

326

Φ89x42

M85x1

3.    Mounted Triple-element F-theta Lenses

1) SL3 Series 3-element F-theta Lenses

Part No.

Wavelength (um)

FL(mm)

WD (mm)

SA

SAR(mm²)

EP

(mm)

a1

(mm)

L1

(mm)

Focus size (um)

MT

Length (mm)

SL3-9.4-50-80W

9.4

80

89.4

+/- 25۫

50X50

14

18

18

84.5

M85X1

39.20

SL3-9.4-60-105Z

9.4

105

60.1

+/- 25۫

60X60

14

18

21

88.5

M85X1

86

SL3-10.6-50-80W

10.6

80

89.4

+/- 25۫

50X50

14

18

18

84.5

M85X1

39.20

SL3-10.6-60-105Z

10.6

105

60.1

+/- 25۫

60X60

14

18

21

88.5

M85X1

86

2) STU3 Series Scan Lenses

Part No.

Wavelength (um)

FL (mm)

SAR (mm)

EP (mm)

Focus size (mm)

STU3-10.6-50-75

10.6

75

50x50

15

89

STU3-10.6-70-100

10.6

100

70x70

15

113

Focused spot size comparison between STSL, STU2 and STU3

Dimension of STU2 and STU3

4. STG Series Telecentric F-theta Lenses

Part No.

FL (mm)

SA max (±°)

SAR (mm)

EP (mm)

FSD (um)

Length (mm)

WD (mm)

STG-10.6-50-100G

100

20

50*50

25

60

93

106

STG-9.6-50-110Z

110

14.5

50*50

15

140

99

97

STG-9.6-70-140Z

140

20

70*70

15

126

142

124

Custom-design and –made available upon request.

  1064nm Scan Lens532nm Scan LensScan Lens at Various WavelengthsBasics of Scan Lens

Share: