Experimental categories: scientific basis for experiments

1 purpose of the experiment

1.1 xenon lamp-pumped

2.1.1 understand the solid-state laser pump source;

2.1.2 understand the process of discharge of the xenon lamp, the radiation spectrum and electro-optical conversion efficiency;

2.1.3 understand the technical parameters and the working life of the xenon lamp;

2.1.4 understand the pre-combustion and energy storage discharge circuit of the xenon lamp.

2.2 optical resonator

2.2.1 understand the evaluation and the criterion of the stability of the optical resonator;

2.2.2 understand the relationship of the stable cavity with the Gaussian beam;

2.2.3 understand the equivalent confocal cavity design principles and methods;

2.2.4 understanding of the Gaussian beam far field divergence angle of the test method;

2.25 understand the three typical cavity - concave (and stable) - Flat (community stability), the flat - convex (unstable) in the laser operation characteristics and design ideas;

2.2.6 to learn the installation and debugging of the optical resonator;

2.2.7 Learning the basic detection methods for laser beam parameters.

2.3 Q-

2.3.1 understand the tune Q-basic principles and methods;

2.3.2 understand the electro-optical Q-principle, structure, operating procedures and the laser output characteristics;

2.3.3 understand the passively Q (saturable absorber), the working principle and the laser output characteristics.

2.4 Frequency Doubling Technology

2.4.1 understand the medium (crystal) nonlinear polarization effect, the nonlinear coefficient.

2.4.2 understand the second harmonic generation, refractive index matching (matching angle)

2.4.3 understand the various factors coupled wave equations, and the impact of the SHG efficiency

2.4.4 the modulation method of learning multiplier

 

2 Experimental content

3.1.1 The use of fiber optic spectrometer records to measure the discharge voltage xenon lamp emission spectra

3.1.2 The current transformer and pin photodetector to measure the discharge current waveform and light discharge waveform, the calculated peak current IN and the light pulse width Th.

 3.2.1 test level - cavity - flat cavity peace - convex cavity injection and output energy curve.

3.2.2 In certain energy (700V) measured three cavity far-field divergence angle

3.2.3 lens compensation method of measuring flat - convex unstable resonator conjugate image point position (test) when measured far-field divergence angle

3.3 Q-test

3.3.1 electro-optical Q-regulation and operation: (1) Static - KD * P electro-optic crystal, a voltage is applied to adjust the optical resonator, so that static light. (2) closed - KD * P electro-optic crystal applied voltage 3600V, but there is no withdrawal pressure signal, then adjust the electro-optic crystal, in order to achieve closed purpose. (3) dynamic - KD * P electro-optic crystal, a voltage is applied, but also the back pressure signal, and then adjust the trigger delay, to find the best dynamic output (laser output energy and short pulse).

3.3.2 (500V, 600V, 700V), to do the Q-switched laser experiments and measurement of laser energy and pulse width of the three injection.

3.3.3Cr +4: YAG Q-test, choose between two Cr +4 crystal (T0 = 35% T0 = 20%) were measured laser output energy to change with the injection (voltage), the width of the measured level, measured pulse width and pulse interval.

3.4 multiplier experiments

3.4.1 Mediation in the electro-optical Q-work state frequency-doubling crystal axis angle, and azimuth to achieve a better phase matching

3.4.2, the measured SHG efficiency in the different baseband energy (also measured pulse width)

4, the main equipment and technical specifications

A laser output wavelength: 1064nm and 532nm

(2) the laser output energy: 200mJ (static), 100mJ (dynamic)

Laser work: repetition frequency of 1Hz, 2Hz, 3Hz, 5Hz

4 Q-way: KD * P electro-optic Q - and Cr +4, YAG saturable absorption Q-

5 octave work: KTP frequency doubling

The instrument features: system architecture is divided into two parts, laser and water-cooled power supply, power water-cooled into one box-type structure, with casters, air-cooling, stainless steel radiator, special quick connect plug to connect with the laser.

Technical indicators

Optical experiments rail 800mm.

YAG Laser Power Supply 500W, repetition frequency 1-5Hz.

KTP frequency doubling crystal 6 * 6 * 5

PIN photodetector rising edge 1ns.