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High-peak-power diode-pumped picosecond lasers
for scientific, technological and navigational applications
International Laser Center of M.V.Lomonosov Moscow State University
All-solid-state technology Excellent beam quality Output and input triggering Widely tunable repetition rate Electro-optical operation control Microcontroller design Internal auto-diagnostics Compactness and ease of operation No water cooling Low power consumption

PICAR
PICOSECOND HIGH-PEAK-POWER QCW DIODE-ARRAY PUMPED Nd:YAG LASERS WITH ELECTROOPTICAL OPERATION CONTROLE

We realized new approach in all-solid-state ultrashort pulse laser development. Compact picosecond electrooptically controlled Nd:YAG laser, pumped with fiber coupled pulsed diode array, combines generation and regenerative amplification modes in one device. Electrooptical operation control system based on the set of thermo-compensated electro-optical modulators provides active mode-locking, negative feed-back, switching operation between connected oscillators, and single pulse output from the oscillator. For maximum pulse shortening, passive mode locking based on nonlinear semiconductor mirror is applied. Combined action of active-passive modelocking and negative feed-back provide shortening of time which is necessary to form output pulse with required parameters. Single ultrashort pulse is produced in each laser shot. This provides conditions for optimal conversion of applied energy into output radiation and precise synchronization of generated pulse with external signal. Control electronics is microcontroller based. All regulation, adjustment procedures and internal state monitoring are fulfilled in "one knob" regime by means encoder lever through branched menu. POWER SCALING
Tunable repetition rate, high beam quality and high single pulse energy provide simplicity of output pulse energy and power scaling LASER + AMPLIFIER 1 Frequency, Hz 100 Energy, mJ 10

Oscillogram of generation process development up to oscillator switching

TECHNICAL PARAMETERS Wavelength, nm Single pulse energy, mJ Energy instability (RMS), % Pulse length (FWHM), ps Repetition rate, Hz 500 Output beam diameter, mm Beam quality, M2 Input and output triggering Output triggering pulse delay, ns Output triggering pulse instability, ns Optical unit size (WвHвL), mm 225в110в400 Electronic module size (WвHвL), mm 440в90в360 Optical unit weight, kg Electronic module weight, kg Interface cable length, m Power consumption, W

1064 up to 0.5 <2 25 up to

1.1 1.2 -500...+500 < 0.2

Middle section fragment of the oscillogram

Beginning of amplification stage in the oscillator

5.5 5.0 2.5 <200

Pulse amplification in the oscillator up to maximal energy

Menu windows examples

Output single selection

pulse

Pulse energy distribution. Repetition rate 300 Hz. Exposition time 8 min. RMS deviation 1.7%

Output beam space profile

Pulse image streak-camera and its time bottom). Pulse

recorded (on the scan (on length 28

by top) the ps

OPTIONALLY Flash-lamp pumped amplifier 2-stage flash-lamp-pumped amplifier Single-pulse correlator 2nd and 3d harmonics converters Diode pumped amplifier (in the development)

100 Hz x 10 mJ 20 Hz x 80 mJ 300 Hz x 3 mJ

APPLICATIONS
Micromachining of extra-hard materials

Laser satellite radars and navigational measurements Picosecond kinetics Biophotonics Time-resolved spectroscopy 3D diagnostics
International Laser Center and Physics Department of M.V.Lomonosov Moscow State University Leninskiye Gory, 119991 GSP-1, Moscow, Russia Phone/fax: +7(495)939-1934 / +7(495)939- 3016 e-mail: morozov@phys.msu.ru

LASER + AMPLIFIERS 1&2 Frequency, Hz 20 Energy, mJ >80