sacher lasertechnik group - lion s5 20170424docs.sacher-laser.com/lion-s5.pdf · microsoft...

Sacher Lasertechnik

Next Generation Littman/Metcalf

LIONTM Joachim R. Sacher

(confidential technical documentation)

Littman / Metcalf Laser Products

| 2

Application Optical Cooling & Trapping

Quantum Dot Spectroscopy

Interferometry, Holography

Telecom Quality Control

Master Laser for MOPA

Motorized Version

Cavity Layout

Product Photo


Next Generation Littman/Metcalf Cavity

Laser

Emission

Wavelength

Adjustment

| 3

Littman/Metcalf Laser – Industrial Grade

Excellent Stability

Low TemperatureDrift

>1.7kHz CavityResonace Freq.

Narrow Linewidth

<100kHz


| 4


Alignment Insensitve Laser Cavity

Reflection Prism as Cavity Mirror

Results:

Ultra Stable Laser Cavity

No Mechanic Disturbance

Hands Off Operation

No Servicing Required


| 5


Tuning Performance Mode-Hop Free Tuning

Grating

Grating

Grating

(a)

(c)

(b)

True Pivot Point Selection

Exact Choice of x0, x1, x2

Synchronization Cavity Defined Wavelength

Grating Defined Wavelength

Result: 10s of Nanometers Mode-

Hop Free Tuning


| 6


Application Example: Acetylene Spectrum Spectrum Recorded via

DC-Motor Tuning

Complete Spectrum no missing lines


200000 220000 240000 260000 280000 300000 320000

-0,04

-0,03

-0,02

-0,01

0,00

Ab

sorp

tion

Sig

nal /

a.u

.

Wavelength / a.u.

Hyperfine Transition (50mTorr)

Spectrum Recorded via Piezo Fine Tuning

Hyperfine transition clearly resolved

| 7


Truly Continuous Wavelength Tuning via DC Motor DC Motor

Stepper Motor

DC Motor Tuning is the preferred solution (confidential technical documentation)

0 1000 2000 3000 4000 50001540

1545

1550

1555

1560

1565

1570

1575

1580

1585

1590

Wa

vele

ng

th /

nm

Scan Time / ms

Stepper Motor

1060 1065 1070 1075 10801550,60

1550,62

1550,64

1550,66

1550,68

1550,70

1550,72

1550,74

1550,76

1550,78

1550,80

Detected Line

Detected Line

Missed Line

Missed Line

Wav

ele

ngth

/ n

mScan Time / ms

Stepper Motor

Missed Line

0 1000 2000 3000 4000 50001540

1545

1550

1555

1560

1565

1570

1575

1580

1585

1590

Wa

vele

ngth

/ n

m

Scan Time / ms

Continuous DC Motor

1060 1065 1070 1075 10801550,60

1550,62

1550,64

1550,66

1550,68

1550,70

1550,72

1550,74

1550,76

1550,78

1550,80

Detected Line

Detected Line

Detected Line

Detected Line

Detected Line

Wav

ele

ngt

h /

nm

Scan Time / ms

Continuous DC Motor

| 8


Compaison between DC Motor and Stepper Motor Each Step of the Stepper Motor causes a Mode-Hop

Typical size of a Mode-Hop of a Stepper Motor driven system is in the order of 3 GHz, depending on the Mode-Spacing of the External Cavity.

Depending on the speed of the detection system, Mode-Hops may not be obvious within the records. Results may be incomplete due to missing spectral lines.

Sacher Lasertechnik decided only to supply DC Motor driven Laser Systems(confidential technical documentation)

1060 1065 1070 1075 10801550,60

1550,62

1550,64

1550,66

1550,68

1550,70

1550,72

1550,74

1550,76

1550,78

1550,80

Wav

ele

ng

th /

nm

Scan Time / ms

Continuous DC Motor

Stepper Motor

1060 1065 1070 1075 10801550,60

1550,62

1550,64

1550,66

1550,68

1550,70

1550,72

1550,74

1550,76

1550,78

1550,80

Detected Line

Detected Line

Missed Line

Missed Line

Wav

ele

ng

th /

nm

Scan Time / ms

Stepper Motor

Missed Line

| 9


DC Motor Tuning Features Acceleration and Deceleration Behavior

DC Motor tuning requires a Acceleration and Deceleration period before reaching the preset tuning speed.

Tuning Speed and Acceleration, Deceleration parameters can be set via Software.


0 200 400 600 800 1000 1200 1400 1600 1800 20000

2

4

6

8

10

Tu

nin

g S

pe

ed

/ nm

/s

Scan Time / ms

| 10


Linewidth Measurement

Measurement Setup Self-Hetherodyne Setup

Laser: 1550nm

Test Results Linewidth: 15 kHz (Lorentz Fit)

Scan Rate: 1ms / div.

RBW: 1kHz

(confidential technical documentation)Data provided by G. Carpintero, Univ. Carlos III, Madrid

| 11


Mechanic Cavity Resonance Measurment Setup

Heterodyne Beat Setup

Laser 1: 30 kHz Littrow Cavity Laser (not modulated)

Laser 2: Littman/Metcalf, 5mV Piezo Modulation

Detection: Linewidth Enhancement via Modulation

Mechanic Resonances No resonances below 1.7kHz

1st resonance 1.85kHz

0 500 1000 1500 2000 2500 30000

5

10

15

20

Fre

quen

cy T

uni

ng /

MH

z

Frequency / Hz

S5 Littman/Metcalf Cavity


| 12

Low Noise Laser Controllers

Micro Controller Operated Laser Controllers

Sub µA Noise Figure

Up to 4000mA Laser

Current

Integrated Function

Generator

Integrated Piezo

Amplifier

Fully Remote Control

Features

USB, GPIB, RS232

Laboratory and

OEM Versions


| 13

Technology: Micro-Controller & FPGA

Low Noise Laser Controllers

Laser Diode Current

Sub µA Noise Figure

102 103 104 105

1E-12

1E-11

1E-10

1E-9

1E-8

Pilot PZ 500 Noise Spectrum

Frequency [Hz]

100mA 200mA 500mA

Cu

rren

t No

ise

[A/

Hz]

10 Resistor

DC Current

Electrical Spectrum AnalyzerLaser Controller


| 14


Realitive Intensity Noise

Measurement Setup Laser Controller (PilotPZ 500)

20MHz Photoreceiver

12 bit Digital Oscilloscope with FFT

Test Results RIN Spectrum

Laser Driver

Diode Laser

Detector

Oszi

Amplifier

0 100 200 300 400 500 600-140

-120

-100

-80

-60

-40

-20

0

Frequency, Hz

Rel

ativ

e In

ten

sity

No

ise

, dB

Littman/Metcalf Laser S5 (with motoroption)

0 1k 2k 3k 4k 5k-140

-120

-100

-80

-60

-40

-20

0

Littman/Metcalf Laser (with motoroption)

Re

lativ

e In

ten

sity

Noi

se, d

B

Frequency, Hz


| 15


| 15

Application Example: Carbon Dioxide CO2 Absoption Spectrum

Matching Laser Systems

1900nm .. 2020nm 1980nm .. 2080nm(confidential technical documentation)

1820 1840 1860 1880 1900 1920 1940 1960 1980 2000 2020

0

2

4

6

8

10

12

14

16

18

20

22

24

Pow

er/m

W

W avelength / nm

1932 1934 1936 1938 1940 1942 1944 1946 1948 1950

8

16

24

Pow

er/

mW

Wavelength / nm1980 2000 2020 2040 2060 2080

0

1

2

3

4

5

6

7

8

9

10

11

Pow

er/m

W

Wavelength / nm

2060 2062 2064 2066 2068 2070 2072 2074 2076 2078 20800

1

2

3

4

5

6

7

8

9

10

11

Pow

er/m

W

Wavelength / nm

| 16


| 16

Application Example: Methane CH4 Absoption Spectrum

Matching Laser System


1600 1620 1640 1660 1680 1700 1720 1740 1760 17800

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

current: 300 mA

temperature: 22 C°

Po

we

r [m

W]

Wavelength [nm]

1640 1645 1650 1655 16600

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

P

ow

er

[mW

]

Wavelength [nm]

| 17


| 17

Application Example: Quantum Dot Spectroscopy Schematic

Examples for Matching Laser Systems


920 930 940 950 960 970 980

50

60

70

80

90

100

110

Po

we

r[m

W]

Wavelength [nm]955 960 965

50

60

70

80

90

100

110

Po

we

r[m

W]

Wavelength [nm]

1046 1048 1050 1052 1054 1056

0

20

40

60

80

100

120

Po

we

r/m

W

Wavelength / nm1010 1020 1030 1040 1050 1060 1070

0

20

40

60

80

100

120

Po

we

r/

mW

Wavelength / nm

| 18


| 18

Application Example: Cesium Spectroscopy Cs D2 Spectra


| 19

Servo Controller

High Frequency PI Regulator 10MHz Bandwidth

Adjustable Corner Frequencies

Integration Hold Function

Low Frequency Gain Limit

FPGA Controlled Operation


via USB

Application: Laser Stabilization Optical Cooling & Trapping

Linewidth Narrowing

Principles of Operation

Product Photo


| 20

Modulator & Demodulator

High Frequency Synthesizer Central 3GHz Clock

2 DDS Syntesizer

100kHz to100MHz Modulation

ns Phase Adjustment

High Frequency Mixer

High Modulation Amplitude


via USB

Application: Laser Stabilization Pound Drever Hall Lock

Optical Cooling & Trapping

Linewidth Narrowing

Principles of Operation

Product Photo


| 21

Corporate Headquarter

Sacher Lasertechnik Headquarter

Space 1200m²

12900 square ft.

30 employees at

location


| 22

Product Family Overview

Laser Controller Laser Controller Laser Controller

AR Coated Laser Diodes

MOPA Laser System MOPA Laser System

Littrow Laser System Littman Laser System Laser Amplifier System

DFB Laser Diodes

THz Laser System

DFB Laser Diodes

SHG Laser System

ns Pulsed Laser System

ps Mode Locked Laser

| 23

Technology: Thin Film Coating Equipment

Thin Film Coating Equipment

Sputter Coater High Volume

Production

R&D Coatings

E-Beam Coater R&D Coatings


| 24

Technology: Diode Laser Chip Handling

Dye Bonder Laser Chip Mounting

Wire Bonder Laser Chip Electrical Connection


| 25

Technology: Electro Optic Micro-Assembly

Multi-Emitter Fiber Coupling

Up to 12 Single Mode Emitters Fiber Coupled

Multi-Wavelength Emitter

Fiber Coupled


Micro External Cavity

| 26

Technology: Electro Optic Micro-Assembly

Compact Package

Excellent Stability

No Moving Parts

No Mechanic CavityResonances

Narrow Linewidth

Low TemperatureDrift


| 27

Thank You For Your Attention!

Sacher Lasertechnik GmbHRudolf-Breitscheid-Str. 1-535037 MarburgGermany

Sacher Lasertechnik LLC.5765 Equador WayBuena Park, CA 90620United States

http://www.sacher-laser.com© 2009 Sacher Lasertechnik GmbH. All rights reserved.

sacher lasertechnik group - lion s5 20170424docs.sacher-laser.com/lion-s5.pdf · microsoft...

Documents